Yamaha RS90PLTE, RST90PGTE, RST90PTFE User Manual

OWNER’S MANUAL
MANUEL DU PROPRIÉTAIRE
USO E MANUTENZIONE
INSTRUKTIONSBOK
OMISTAJAN KÄSIKIRJA
EIERHÅNDBOK

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SF

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Read this manual carefully before operating this vehicle.
Il convient de lire attentivement ce manuel avant la première utilisation du véhicule.

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Leggere attentamente questo manuale prima di utilizzare questo veicolo.
Läs den här instruktionsboken noga innan snöskotern används.
Lue tämä käsikirja huolellisesti ennen moottorikelkan käyttöä.
Les denne håndboken nøye før du tar kjøretøyet i bruk.

RS90PLTE

RST90PGTE

RST90PTFE

8HX-28199-S2

Original instructions

Notice originale

Istruzioni originali

Bruksanvisning i original

Alkuperäiset ohjeet

Opprinnelige instruksjoner

PRINTED IN JAPAN

2013.05-0.3×1 CR

PRINTED ON RECYCLED PAPER
IMPRIMÉ SUR PAPIER RECYCLÉ

STAMPATO SU CARTA RICICLATA

TRYCKT PÅ ÅTERVUNNET PAPPER

PAINETTU UUSIOPAPERILLE

TRYKKET PÅ RESIRKULERT PAPIR

Read this manual carefully

before operating this vehicle.

OWNER’S MANUAL

RS90PLTE

RST90PGTE

RST90PTFE

8HX-28199-S2-E0

ESU13157

Read this manual carefully before operating this vehicle. This manual

should stay with this vehicle if it is sold.

EC Declaration of Conformity

conforming to Directive 2006/42/EC

We, YAMAHA MOTOR CO., LTD. 2500 Shingai, Iwata, Japan,

declare in sole responsibility, that the product

RS10ST (RS90PLT
RS10SUV (RST90PTF
RS10VTGT (RST90PGT

to which this declaration applies, conforms to the essential health and safety
requirements of Directive 2006/42/EC

(

If applicable

and to the other relevant Directive of EEC

(

If applicable

To effect correct
stated in the Directives of EEC, the
specifications were consulted:

)

(

Title and

/

or number and date of issue of the other Directives of EEC

)

application

(

Title and

/

or number and date of issue of standards and/or specifications

Authorized Representative

YAMAHA MOTOR EUROPE N.V.
Koolhovenlaan 101, 1119 NC Schiphol-Rijk, The Netherlands

) (

JYE8HW00∗EA003774-

) (

JYE8HY00

) (

JYE8HX00

(

)

Make, model

2004/108/EC

of the

essential

health

following-standards and/or

– – – – – –

Signature

General Manager
Engineering Div., RV Business Unit
Business Development Operations

Date of Issue

Akihiro Tsuzuki

7 November, 2012

EA004663-

∗

EA003444-

∗

and safety requirements

)
)
)

)

technical

)

ESU10131

WARNING

Congratulations on your purchase of a
Yamaha snowmobile. This model is the result
of Yamaha’s vast experience in the produc­tion of fine sporting and touring snowmobiles.
It represents the high degree of craftsmanship
and reliability that have made Yamaha a lead­er in these fields.
This manual will give you an understanding of
the operation, inspection, and basic mainte­nance of this snowmobile. If you have any
questions concerning the operation or main­tenance of your snowmobile, please consult a
Yamaha dealer.
Yamaha continually seeks advancements in
product design and quality. Therefore, while
this manual contains the most current product
information available at the time of printing,
there may be minor discrepancies between
your snowmobile and this manual. If there is
any question concerning this manual, please
consult a Yamaha dealer.

EWS00670

Introduction

RS90PLTE

RST90PGTE

RST90PTFE

OWNER’S MANUAL

©2013 by Yamaha Motor Co., Ltd.

1st Edition, March 2013

All rights reserved.

Any reprinting or unauthorized use

without the written permission of

Yamaha Motor Co., Ltd.
is expressly prohibited.

Printed in Japan.

Please read this manual carefully before
operating this snowmobile. Do not attempt
to operate this snowmobile until you have
attained adequate knowledge of its con­trols and operating features.
Regular inspections and careful mainte­nance, along with good operating tech­niques, will help ensure that you safely
enjoy the capabilities and reliability of this
snowmobile.

Important manual information

WARNING

NOTICE

TIP

ESU10151

Particularly important information is distin­guished in this manual by the following nota­tions.

This is the safety alert symbol. It is used
to alert you to potential personal injury haz­ards. Obey all safety messages that follow
this symbol to avoid possible injury or death.

EWS00021

A WARNING indicates a hazardous situa­tion which, if not avoided, could result in
death or serious injury.

ECS00011

A NOTICE indicates special precautions
that must be taken to avoid damage to the
snowmobile or other property.

A TIP provides key information to make pro­cedures easier or clearer.

Contents

Location of the important labels ..... 1

Safety information ............................ 8

Description ...................................... 11

Control functions ............................ 13

Main switch .................................. 13

Throttle lever ................................ 13

Throttle override system

(T.O.R.S.) .................................. 13

Multi-function meter unit ............... 14

High beam indicator light .............. 17

Low coolant temperature indicator

light ............................................ 17

Fuel meter and grip/thumb warmer

level indicator ............................ 17

Fuel level warning indicator .......... 19

Oil level/pressure warning

indicator ..................................... 19

Coolant temperature warning

indicator ..................................... 20

Electric power steering warning

indicator “EPS” .......................... 20

Self-diagnosis device ................... 21

Engine stop switch ....................... 21

Headlight beam switch

“LIGHTS” ................................... 21

Grip/thumb warmer adjusting

switch ........................................ 22

Auxiliary DC jack .......................... 22

Brake lever ................................... 23

Parking brake lever ...................... 23

Shift lever ..................................... 23

Drive guard ................................... 24

V-belt holders ............................... 25

Passenger grips

(RST90PGT / RST90PTF) ........ 25

Passenger grip warmer switch

(RST90PGT / RST90PTF) ........ 26

Passenger footrests

(RST90PGT / RST90PTF) ........ 26

Backrest

(RST90PGT / RST90PTF) ........ 27

Storage compartment .................. 27

Tow hitch [RST90PGT /

RST90PTF (RUSSIA)] and

tow hitch bracket [RST90PGT /

RST90PTF (EUROPE)] ............ 29

Fuel .............................................. 30

Suspension .................................. 31

Pre-operation checks ..................... 39

Pre-operation check list ............... 39

Operation ......................................... 41

Starting the engine ....................... 41

Break-in ........................................ 42

Riding your snowmobile ............... 42

Maximizing drive track life ............ 46

Driving .......................................... 47

Stopping the engine ..................... 48

Transporting ................................. 48

Periodic maintenance and

adjustment....................................... 49

Periodic maintenance chart for the

emission control system ........... 50

General maintenance and

lubrication chart ........................ 51

Tool kit ......................................... 53

Recommended equipment ........... 54

Removing and installing the

shroud and covers .................... 54

Checking the spark plugs ............. 58

Adjusting the throttle lever free

play ........................................... 59

Checking the throttle override

system (T.O.R.S.) ..................... 62

Checking the air filter ................... 63

High-altitude settings ................... 66

Valve clearance ........................... 66

Engine oil and oil filter cartridge ... 67

Cooling system ............................ 71

Contents

V-belt ............................................ 74

Drive chain housing ...................... 77

Brake and parking brake .............. 78

Extrovert drive sprocket ............... 81

Skis and ski runners ..................... 81

Steering system ........................... 83

Drive track and slide runners ....... 83

Lubrication .................................... 87

Replacing a headlight bulb ........... 88

Adjusting the headlight beams ..... 91

Fittings and fasteners ................... 91

Battery .......................................... 91

Replacing a fuse .......................... 92

Troubleshooting ............................. 97

Storage .......................................... 101

Specifications ............................... 103

Consumer information.................. 106

Identification number records ..... 106

WARRANTY................................ 106

Location of the important labels

4

3

2

1

5

RS90PLT

11

8

10

9

RS90PLT

12

12

8

11

7

10

6

12

12

RST90PGT / RST90PTF

RST90PGT / RST90PTF

1

2

5

3

4

ESU12679

Read and understand all of the labels on your vehicle. They contain important information for
safe and proper operation of your vehicle. Never remove any labels from your vehicle. If a label
becomes difficult to read or comes off, a replacement label is available from your Yamaha deal­er.

For EUROPE

1

Location of the important labels

1

2

3

TUNE-UP SPECIFICATIONS

ENGINE

1.SPARK PLUG

2.SPARK PLUG GAP

3.IDLE SPEED

CR8E(NGK)

0.7 ~ 0.8 mm (0.028 ~ 0.031 in)
1300 ± 50 r/min

SPECIFICATIONS DE LA MISE AU POINT

MOTEUR

1.TYPE DE BOUGIE

2.ECARTEMENT DES ÉLECTRODES

3.RÉGIME DE RALENTI

1300 ± 50 r/min

4

TUNE-UP SPECIFICATIONS

DRIVE

1. CHAIN CASE OIL Q’TY

2. CHAIN CASE OIL TYPE

3. TRACK TENSION

* FOR MORE INFO: SEE SERVICE MANUAL FOR THIS
MODEL.
* SPECIFICATIONS SUBJECT TO CHANGE WITHOUT
NOTICE.

30 ~ 35 mm (1.18 ~ 1.38 in)/100 N (10 kg, 22 lb)

250 cm³ (8.5 oz)

GL-3 75W or 80W

SPECIFICATIONS DE LA MISE AU POINT

ENTRAÎNEMENT

1. CAPACITÉ D’HUILE DU CARTER DE CHAÎNE

2. TYPE D’HUILE DU CARTER DE CHAÎNE

3. FLÈCHE DE LA CHENILLE
* POUR PLUS DE DÉTAIL: VOIR LE MANUEL D’ATELIER

POUR CE MODÈLE.
* LES CARACTÉRISTIQUE TECHNIQUES SONT
SUSCEPTIBLES DE CHANGER SANS NOTIFICATION
PRÉALABLE.

GL-3 75W or 80W
30 ~ 35 mm/100 N (10 kg)

5 RS90PLT 5 RST90PGT / RST90PTF

8FR-77763-S0

8HF-77763-S0

CR8E(NGK)

0.7 ~ 0.8 mm

8HF-1417E-00

250 cm³

8ES-47578-00

8HF

2

Location of the important labels

6 RST90PGT / RST90PTF

<

1176 N

<

147 N

8HF-2817S-00

7 RST90PGT / RST90PTF

MAX.BELASTNING/RASKAIN TAAKKA

20kg {44lbs}

8FM-24897-11

9 RS90PLT

10

8 RS90PLT

RS10ST

88.4 kW 313 kg

8HW-2156A-00

8 RST90PGT

RS10VTGT

88.4 kW 347 kg

8HX-2156A-00

8 RST90PTF

RS10SUV

88.4 kW 349 kg

8HY-2156A-00

11

8FA-S0

2013

YAMAHA MOTOR CO., LTD.
2500 SHINGAI, IWATA, JAPAN

8AC-2817L-00

12

8FA-2389C-S0

3

Location of the important labels

******

*** kW *** kg

1

23

YAMAHA MOTOR CO., LTD.
2500 SHINGAI, IWATA, JAPAN

****

1

Read the Owner’s manual.

This unit contains high-pressure nitrogen gas.
Mishandling can cause an explosion. Do not incinerate,
puncture or open.

This pictogram shows the sled hitch tow weight limit
(combined weight of the sled and all cargo in the sled).
Overloading can cause loss of control.
Loss of control can result in severe injury or death.

This pictogram shows the sled hitch tongue weight limit
(weight on the sled tongue).
Overloading can cause loss of control.
Loss of control can result in severe injury or death.

1

2

3

Model Name
Max. Power
Mass In Running Order

1

Year of construction

Familiarize yourself with the following pictograms and read the explanatory text.

4

For RUSSIA

RST90PGT / RST90PTF

1

2

6

5

3

4

10

11

9

8

7

12

12

13

Location of the important labels

5

Location of the important labels

1

2

8HP-77761-R0

3

TUNE-UP SPECIFICATIONS

ENGINE

1.SPARK PLUG

2.SPARK PLUG GAP

3.IDLE SPEED

CR8E(NGK)

0.7 ~ 0.8 mm (0.028 ~ 0.031 in)
1300 ± 50 r/min

4

TUNE-UP SPECIFICATIONS

DRIVE

1. CHAIN CASE OIL Q’TY

2. CHAIN CASE OIL TYPE

3. TRACK TENSION

* FOR MORE INFO: SEE SERVICE MANUAL FOR THIS
MODEL.
* SPECIFICATIONS SUBJECT TO CHANGE WITHOUT
NOTICE.

30 ~ 35 mm (1.18 ~ 1.38 in)/100 N (10 kg, 22 lb)

250 cm³ (8.5 oz)

GL-3 75W or 80W

5

6

8JE-77764-R0

SPECIFICATIONS DE LA MISE AU POINT

MOTEUR

1.TYPE DE BOUGIE

2.ECARTEMENT DES ÉLECTRODES

3.RÉGIME DE RALENTI

CR8E(NGK)

0.7 ~ 0.8 mm

1300 ± 50 r/min

8HF-1417E-00

SPECIFICATIONS DE LA MISE AU POINT

ENTRAÎNEMENT

1. CAPACITÉ D’HUILE DU CARTER DE CHAÎNE

2. TYPE D’HUILE DU CARTER DE CHAÎNE

3. FLÈCHE DE LA CHENILLE
* POUR PLUS DE DÉTAIL: VOIR LE MANUEL D’ATELIER

POUR CE MODÈLE.
* LES CARACTÉRISTIQUE TECHNIQUES SONT
SUSCEPTIBLES DE CHANGER SANS NOTIFICATION
PRÉALABLE.

250 cm³

GL-3 75W or 80W
30 ~ 35 mm/100 N (10 kg)

8ES-47578-00

8HF

Location of the important labels

67

<

1176 N

<

147 N

8HF-2817S-00

8HF-77763-S0

8

2013

YAMAHA MOTOR CO., LTD.
2500 SHINGAI, IWATA, JAPAN

8AC-2817L-00

10 RST90PGT

RS10VTGT

88.4 kW 347 kg

10 RST90PTF

RS10SUV

88.4 kW 349 kg

8HX-2156A-00

8HY-2156A-00

9

MAX.BELASTNING/RASKAIN TAAKKA

20kg {44lbs}

8FM-24897-11

11

8FA-S0

8FA-2389C-S0

1312

8HN-2811S-00

7

Safety information

ESU14620

As the vehicle’s owner, you are responsible
for the safe and proper operation of your
snowmobile. When you ride your snowmo­bile, you must know and use the following for
your safety. Severe injury or death may result
if you ignore any of the following.

Before you operate your snowmobile

● Read the Owner’s Manual and all labels.

Become familiar with all of the operating
controls and their function. Consult a
Yamaha dealer about any control or func­tion you do not understand.

● Wear protective clothing. Wear an ap-

proved helmet, and a face shield or gog­gles. Also, wear a good quality snowmobile
suit, boots, and a pair of gloves or mittens
that will permit use of your thumbs and fin­gers for operation of the controls.

creases the possibility of an accident or
equipment damage. See page 39 for a list
of pre-operation checks.

● Apply the parking brake before starting the

engine. Never drive the snowmobile with
the parking brake applied. This may over­heat the brake disc and reduce braking abil­ity.

While using your snowmobile

● This snowmobile was not manufactured for

use on public streets, roads, or highways.
Such use is prohibited by law, and you
could collide with another vehicle.

● RS90PLT is designed to carry the OPERA-

TOR ONLY. Passengers are prohibited.
Carrying a passenger can cause loss of
control.

● Do not operate the snowmobile after or

while drinking alcohol or taking drugs. Your
ability to operate the snowmobile is re­duced by the influence of alcohol or drugs.

Prepare your snowmobile

● Perform the pre-operation checks each

time you use the vehicle to make sure it is
in safe operating condition. Failure to in­spect or maintain the vehicle properly in-

8

● Be careful where you ride. There may be

obstacles hidden beneath the snow. Stay
on established trails to minimize your expo­sure to hazards. Ride slowly and cautiously
when you ride off of established trails. Hit­ting a rock or stump, or running into wires
could cause an accident and injury.

● This snowmobile is not designed for use on

surfaces other than snow or ice. Use on dirt,
sand, grass, rocks, or bare pavement may
cause loss of control and may damage the
snowmobile.

Safety information

● Always ride with other snowmobilers when

going on a ride. You may need help if you
run out of fuel, have an accident, or damage
your snowmobile.

● Many surfaces such as ice and hardpacked

snow require much longer stopping distanc­es. Be alert, plan ahead and begin deceler­ating early. The best braking method on
most surfaces is to release the throttle and
apply the brake gently—not suddenly.

Avoid carbon monoxide poisoning

All engine exhaust contains carbon monox­ide, a deadly gas. Breathing carbon monoxide
can cause headaches, dizziness, drowsiness,
nausea, confusion, and eventually death.
Carbon monoxide is a colorless, odorless,
tasteless gas which may be present even if
you do not see or smell any engine exhaust.
Deadly levels of carbon monoxide can collect
rapidly and you can quickly be overcome and
be unable to save yourself. Also, deadly lev­els of carbon monoxide can linger for hours or
days in enclosed or poorly-ventilated areas. If
you experience any symptoms of carbon
monoxide poisoning, leave the area immedi­ately, get fresh air, and SEEK MEDICAL
TREATMENT.

● Do not run the engine indoors. Even if you

try to ventilate engine exhaust with fans or
open windows and doors, carbon monoxide
can rapidly reach dangerous levels.

● Do not run the engine in poorly ventilated or

partially enclosed areas such as barns, ga­rages, or carports.

● Do not run the engine outdoors where en-

gine exhaust can be drawn into a building
through openings such as windows and
doors.

Genuine Yamaha Accessories

Choosing accessories for your snowmobile is
an important decision. Genuine Yamaha Ac­cessories, which are available only from a
Yamaha dealer, have been designed, tested,
and approved by Yamaha for use on your
snowmobile. Many companies with no con­nection to Yamaha manufacture parts and ac­cessories or offer other modifications for
Yamaha vehicles. Yamaha is not in a position
to test the products that these aftermarket
companies produce. Therefore, Yamaha can
neither endorse nor recommend the use of
accessories not sold by Yamaha or modifica­tions not specifically recommended by
Yamaha, even if sold and installed by a
Yamaha dealer.

Maintenance and storage

● When laying the snowmobile on its side for

maintenance, use a suitable stand to keep
it in a stable and level position.

● Do not leave the snowmobile on its left side

for an extended period of time. Fuel may
leak out from the fuel breather hose.

● Do not allow anyone to stand behind the

snowmobile when starting, inspecting, or
adjusting the snowmobile. A broken track,
track fittings, or debris thrown by the track
could be dangerous to the operator or by­standers.

● Modifications made to the snowmobile not

approved by Yamaha, or the removal of
original equipment may render your snow­mobile unsafe for use, which may cause se­vere personal injury. Modifications may
also make the snowmobile illegal to use.

● Never store the snowmobile with fuel in the

fuel tank inside a building where ignition
sources are present such as hot water and
space heaters, an open flame, sparks,

9

Safety information

clothes dryers, and the like. Allow the en­gine to cool off before storing the snowmo­bile in an enclosed space.

10

ESU10261

1,2,3 4 8 9 1011,12,13 14

161718

1,2,3 4 1011,12,13 14 15

161718

5,6

5,6

15

RST90PGT

RST90PTF

89

1,2,3

RS90PLT

4 5,6,7 11,13 14

161718

Description

1. Battery

2. Main fuse

3. Air filter

4. Oil filler cap

5. Fuse box

6. Coolant reservoir

7. Coolant recovery tank

8. Passenger grip warmer switch

9. Passenger grip

10. Backrest

11. Storage compartment

12. Storage pouch (RST90PGT / RST90PTF)

13. Tool kit

14. Tail/brake light

15. Tow hitch [RST90PGT / RST90PTF
(RUSSIA)] / tow hitch bracket [RST90PGT /
RST90PTF (EUROPE)]

16. Slide rail suspension

17. Drive track

18. V-belt holder

11

Description

TIP

1 23 546

7

8

9

10

1

RS90PLT

RST90PGT / RST90PLT

23 546

9

7

8

10

1. Brake lever

2. Parking brake lever

3. Grip warmer adjusting switch

4. Thumb warmer adjusting switch

5. Engine stop switch

6. Throttle lever

7. Main switch

8. Shift lever

9. Auxiliary DC jack

10. Headlight beam switch

● The snowmobile you have purchased may differ slightly from those shown in the figures of

this manual.

● Design and specifications are subjected to change without notice.

12

Control functions

TIP

WARNING

13

2

ESU10292

Main switch

The main switch controls the ignition and
lighting systems. The various positions are
described below.

1. Off

2. On

3. Start

Off

The ignition circuit is switched off.
The key can be removed only in this position.

On

The ignition circuit is switched on.

Start

The starting circuit is switched on.
The starter motor cranks the engine.

NOTICE: Release the switch immediately
after the engine starts.

The headlights and taillight come on after the
engine is started.

ESU10312

[ECS00021]

Throttle lever

Once the engine is running cleanly, squeez­ing the throttle lever will increase the engine
speed and cause engagement of the drive
train. Regulate the speed of the snowmobile
by varying the throttle position. Because the

throttle is spring-loaded, the snowmobile will
decelerate, and the engine will return to idle
when it is released.

1. Throttle lever

ESU13242

Throttle override system (T.O.R.S.)

EWS00041

If the T.O.R.S. is activated, make sure that
the cause of the malfunction has been cor­rected and that the engine can be operated
without a problem before restarting the
engine. Continuing to operate with a mal­function could cause loss of control or
damage.

If the throttle valves or throttle cable malfunc­tions during operation, the T.O.R.S. will be ac­tivated when the throttle lever is released.
The T.O.R.S. is designed to override the fuel
injection and limit the engine speed to less
than the clutch engagement speed if the throt­tle valves fail to return to the idle position
when the throttle lever is released. (See page
103 for the clutch engagement speed.)

13

Control functions

TIP

FHI

E LO EPS

10

9

6

8

12 3 4 5

7

Malfunc-

tion

T. O. R . S .

will be ac-

tivated.

Throttle
lever

Throttle
valve

T.O. R.S.

Idling Riding

Released Squeezed Released

Closed Open Open

Engine

runs

properly.

Engine

runs

properly.

If the T.O.R.S. is activated, the warning light
and engine trouble warning indicator flash,
and the two-digit code “84” displays in the
meter display. If this occurs, have a Yamaha
dealer check the system as soon as possible.

● an oil change tripmeter (which shows the

distance traveled since the periodic oil
change interval was reached)

● a clock

● warning indicators (which show engine

trouble, coolant temperature, fuel level, and
oil level warnings)

● indicator lights (which show high beam and

low coolant temperature conditions)

● a warning light (which shows warnings to-

gether with the warning indicators)

● a fuel meter (which shows the fuel remain-

ing in the fuel tank)

● a grip/thumb warmer level indicator (which

shows the grip warmer level or the thumb
warmer level)

● a display brightness control function

When the key is turned to the on position, the
tachometer needle makes one sweep, and
the low coolant temperature indicator light,
the warning light, and all segments of the
meter unit display come on and go off.

1. Warning light “ ”

2. Engine trouble warning indicator “ ”

3. Two-digit code “84”

ESU14520

Multi-function meter unit

The multi-function meter unit is equipped with
the following:

● a digital speedometer

● a tachometer

● an odometer

● two tripmeters (which show the distance

traveled since they were last set to zero)

● a fuel reserve tripmeter (which shows the

distance traveled since the fuel level warn­ing indicator and warning light came on)

14

1. “RESET” button

2. “SELECT” button

3. Tachometer

4. Warning indicators

5. Clock

6. Low coolant temperature indicator
light “ ”

7. High beam indicator light “ ”

8. Warning light “ ”

9. Electric power steering warning indicator
“EPS”

10. Meter display

Control functions

TIP

TIP

1

The grip warmer level is initially displayed for
5 seconds, then the display switches to the
fuel meter.

To switch the speedometer, odometer, and
tripmeter displays between kilometers and
miles, select the odometer mode “ODO”, and
then push the “SELECT” button for at least 10
seconds while the snowmobile is stopped.

Odometer and tripmeter modes

E LO

1. Odometer/tripmeter/fuel reserve tripmeter

Pushing the “SELECT” button switches the
display between the odometer mode “ODO”
and the tripmeter modes “TRIP A” and “TRIP
B” in the following order:
ODO → TRIP A → TRIP B → ODO
If the fuel level warning indicator and warning
light come on (see page 17), the odometer
display will automatically change to the fuel
reserve tripmeter mode “TRIP F” and start
counting the distance traveled from that point.
In that case, push the “SELECT” button to
switch the display between the various trip­meter and odometer modes in the following
order:
TRIP F → ODO → TRIP A → TRIP B → TRIP
F
To reset a tripmeter, select it by pushing the
“SELECT” button, and then push the “RE­SET” button for at least 1 second. If you do not
reset the fuel reserve tripmeter manually, it

will reset itself automatically, and the display
will return to the prior mode after the snowmo­bile has been refueled and traveled 5 km (3
mi).

Oil change tripmeter

When the periodic oil change interval is
reached at the initial 800 km (500 mi), then at
every 4000 km (2500 mi) thereafter, the oil
change tripmeter and “OIL” flash alternately in
the odometer display, and the tripmeter starts
counting the distance traveled from that point.
When this occurs, change the engine oil as
soon as possible. (See page 67 for the oil
change procedure.)

E LO

● The oil change tripmeter will flash only

when the snowmobile is stopped.

● To return to the previous display mode,

push the “SELECT” button. To display the
oil change tripmeter again, turn the key to
the off position, then back to the on position.

After changing the engine oil, reset the oil
change tripmeter as follows.

To reset the oil change tripmeter (when the
engine oil was changed after the oil change
tripmeter appeared)

1. To display the oil change tripmeter, turn
the key to the on position.

15

Control functions

TIP

1

2. Push the “RESET” button for at least 1
second while the oil change tripmeter and
“OIL” are flashing alternately in the odom­eter display. The distance traveled since
the last oil change and “OIL” will flash al­ternately in the odometer display.

3. Push the “RESET” button for approxi­mately 3 seconds. “00000” and “OIL” will
flash alternately in the odometer display 3
times, and then the display will return to
the previous display mode.

If the engine oil is changed before the oil
change tripmeter appears in the display (i.e.,
before the periodic oil change interval has
been reached), the tripmeter must be reset af­ter the oil change for the next periodic oil
change to be indicated at the correct time.
In that case, reset the oil change tripmeter as
follows.

To reset the oil change tripmeter (when the
engine oil was changed before the oil change
tripmeter appeared)

1. Push the “SELECT” button until “ODO” is
displayed, and then push the “RESET”
button for at least 1 second. The distance
traveled since the last oil change and
“OIL” will flash alternately in the odometer
display.

2. Push the “RESET” button for approxi­mately 3 seconds. “00000” and “OIL” will
flash alternately in the odometer display 3
times, and then the display will return to
the previous display mode.

Clock

F

E

1. Clock

To set the clock

1. Turn the key to the on position.

2. Push the “SELECT” button and “RESET”
button simultaneously until the hour digits
start flashing.

3. Push the “RESET” button to change the
hour setting, and then push the “SE­LECT” button. The minute digits will start
flashing.

4. Push the “RESET” button to change the
minute setting, and then push the “SE­LECT” button. The clock starts when the
“SELECT” button is released.

The clock must be set again when the battery
is disconnected.

Display brightness control

This function allows you to adjust the bright­ness of the meter unit display to suit the out­door lighting conditions.

16

TIP

1. Display brightness level

1

To adjust the display brightness

1. Turn the key to the off position.

2. Push and hold down the “SELECT” but­ton.

3. Turn the key to the on position, and then,
after 5 seconds, release the “SELECT”
button.

4. Push the “RESET” button to select the
desired display brightness level, and then
push the “SELECT” button. The display
returns to the previous display mode.

ESU10411

High beam indicator light “ ”

The high beam indicator light comes on when
the high beams of the headlights are switched
on. (See page 21 for headlight beam switch
operation.)

Control functions

ESU10473

Low coolant temperature indi­cator light “ ”

The low coolant temperature indicator light
comes on when the coolant temperature is
low and informs the rider that the snowmobile
should be warmed up. After the engine is
started, warm it up until the indicator light
goes off.
The snowmobile can be operated normally af­ter the indicator light goes off.

1. Low coolant temperature indicator
light “ ”

Drive the snowmobile at low speeds when the
low coolant temperature indicator light is on. If
the engine speed is too high, maximum en­gine speed is reduced to protect the engine.

ESU10427

Fuel meter and grip/thumb warmer level indicator

The fuel meter and grip/thumb warmer level
indicator have eight segments which show
the amount of fuel remaining in the fuel tank,
the grip warmer level, or the thumb warmer
level.

1. High beam indicator light “ ”

17

Control functions

TIP

1

1. Fuel meter and grip/thumb warmer level in­dicator

Fuel meter

The display segments of the fuel meter disap­pear towards “E” (Empty) as the fuel level de­creases. When only one segment is left near
“E”, the fuel level warning indicator and the
warning light come on.

Grip/thumb warmer level indicator

When the grip warmer adjusting switch is
pressed, the grip warmer indicator comes on
and the display switches to the grip warmer
level.
When the thumb warmer adjusting switch is
pressed, the thumb warmer indicator comes
on and the display switches to the thumb
warmer level.
See “Grip/thumb warmer adjusting switch” on
page 22 for detailed information.

1. Grip warmer indicator “ ”

2. Thumb warmer indicator “ ”

1. Fuel level warning indicator “ ”

2. Warning light “ ”

If the fuel level warning indicator and the
warning light come on, refuel as soon as pos­sible.

The snowmobile must be stopped on a level
surface to obtain an accurate fuel meter read­ing, since the reading changes according to
the movement and inclination of the snowmo­bile.

18

1. Grip warmer adjusting switch

Control functions

TIP

31 24

1. Thumb warmer adjusting switch

● The grip/thumb warmer level is displayed

for 5 seconds after releasing the grip/thumb
warmer adjusting switch, then the display
switches to the fuel meter.

● The top segment of the grip/thumb warmer

level indicator flashes once when the
grip/thumb warmer adjustment reaches the
maximum level. The bottom segment of the
grip/thumb warmer level indicator flashes
once when the grip/thumb warmer adjust­ment reaches the minimum level.

● When the engine is started, the grip/thumb

warmer levels are set to the levels selected
when the engine was last stopped.

ESU13252

Fuel level warning
indicator “ ”

The fuel level warning indicator and the warn­ing light come on when the fuel level is low.
(See page 17 for details.)
The fuel level warning indicator, the warning
light, the fuel meter indicator, and all seg­ments of the fuel meter start to flash when a
malfunctioning sensor, disconnected coupler,
broken lead, or short circuit is detected by the
self-diagnosis device of the snowmobile to
warn the rider of any of the above problems.
If this occurs, have a Yamaha dealer inspect
the snowmobile as soon as possible.

1. Fuel level warning indicator “ ”

2. Warning light “ ”

3. Fuel meter

4. Fuel meter indicator “ ”

ESU13991

Oil level/pressure warning
indicator “ ”

The oil level/pressure warning indicator has
two functions. The warning indicator comes
on when the engine oil level is low and when
the engine oil pressure is low. The functions
are explained in the following sections.

Oil level warning

The warning indicator and the warning light
come on when the engine oil level is low.

1. Oil level/pressure warning indicator “ ”

2. Warning light “ ”

If the warning indicator and the warning light
come on, place the snowmobile on a level
surface and allow it to idle for one minute.

19

Control functions

TIP

NOTICE

1

2

If the warning indicator and the warning light
go off, the engine oil level is sufficient, howev­er it is getting low. Add engine oil as soon as
possible.
If the warning indicator and the warning light
do not go off, check the engine oil level in the
oil tank (see page 67 for engine oil level
checking procedures), and add engine oil if
necessary.
If the warning indicator and the warning light
still remain on, have a Yamaha dealer check
the snowmobile.

Oil pressure warning

The warning indicator comes on and “OP-LO”
(oil pressure low) appears in the odometer
display if the engine oil pressure is low when
the engine is started. At the same time, the
engine speed is limited to less than the clutch
engagement speed until the warning indicator
goes off.
If the engine oil pressure remains low for one
minute, the engine stops. If this occurs, have
a Yamaha dealer check the snowmobile.

oil circulates through the engine. The snow­mobile can be operated normally after the
warning indicator goes off.

ESU10513

Coolant temperature warning
indicator “ ”

If the engine overheats, the coolant tempera­ture warning indicator and the warning light
come on. When this occurs, stop the engine
immediately and allow the engine to cool
down, and then check the coolant level in the
coolant reservoir. (See page 71 for checking
procedures.)

1. Coolant temperature warning indicator “ ”

2. Warning light “ ”

ECS00041

1. Oil level/pressure warning indicator “ ”

2. “OP-LO” (oil pressure low)

If there is no engine oil in the oil passages
when the engine is started, such as after the
engine oil is changed, the warning indicator
may come on and “OP-LO” may appear in the
odometer display for a few seconds until the

20

Do not continue to operate the engine if it
is overheating.

ESU13812

Electric power steering warning indicator “EPS”

The electric power steering warning indicator
comes on when the key is turned to the on po­sition, and then goes off once the engine is
started. If the warning indicator remains on or
comes on after the engine is started, the EPS
system may not be working correctly. When
this occurs, have a Yamaha dealer check the
EPS system.

Control functions

TIP

312

1. Electric power steering warning indicator
“EPS”

If the steering load is too heavy (i.e., exces­sive steering use when the snowmobile is
traveling at a slow speed), the power assist is
reduced to protect the EPS motor from over­heating.

ESU13365

Self-diagnosis device

This model is equipped with a self-diagnosis
device for various electrical circuits.
If a problem is detected in any of those cir­cuits, the warning light and the engine trouble
warning indicator flash, and an error code dis­plays in the meter display. Note the error
code, and then have a Yamaha dealer inspect
the snowmobile as soon as possible.

NOTICE: Do not continue to operate the
engine longer than necessary if there is an
error code to avoid possible engine dam­age.

[ECS00820]

1. Warning light “ ”

2. Engine trouble warning indicator “ ”

3. Error code display

ESU10531

Engine stop switch “ ”

The engine stop switch is used to stop the en­gine in an emergency. Simply push the stop
switch to stop the engine. To start the engine,
pull the stop switch and proceed with starting
the engine. (See page 41 for engine starting
procedures.)

1. Engine stop switch “ ”

During the first few rides, practice using the
stop switch so that you can react quickly in an
emergency.

ESU10661

Headlight beam switch
“LIGHTS”

Push the headlight beam switch to change the
headlight to high beam “HI” or to low beam
“LO”.

21

Control functions

TIP

NOTICE

1

1

2

1. Headlight beam switch “LIGHTS”

2. High beam “HI”

3. Low beam “LO”

ESU12654

Grip/thumb warmer adjusting switch

The grip warmer adjusting switch and the
thumb warmer adjusting switch control the
electrically heated handlebar grips and throt­tle lever respectively.

To raise the temperature

To raise the temperature, press the respec­tive switch to “HI”.

To lower the temperature

To lower the temperature, press the respec­tive switch to “LO”.
See “Fuel meter and grip/thumb warmer level
indicator” on page 17 for detailed information.

ESU10696

Auxiliary DC jack

The auxiliary DC jack is located in the front
panel and can be used for accessories.

The auxiliary DC jack can only be used if the
engine is running.

To use the auxiliary DC jack

1. Start the engine.

2. Open the auxiliary DC jack cap, and then
insert the accessory power plug into the
jack.

1. Grip warmer adjusting switch

1. Thumb warmer adjusting switch

22

1. Auxiliary DC jack cap

2. Auxiliary DC jack

3. After using the auxiliary DC jack, be sure
to remove the accessory power plug from
the jack and to close the auxiliary DC jack
cap.

ECS00122

● To avoid circuit overload and a possible

fuse blowing, do not use accessories re­quiring more than the maximum rated

Control functions

TIP

NOTICE

capacity for the auxiliary DC jack. (See
page 92 for the specified fuse amper­age.)

● Do not use an automotive cigarette light-

er or other accessory with a plug that
gets hot because the jack can be dam­aged.

Maximum rated capacity:

DC 12 V, 2.5 A (30 W)

ESU10551

Brake lever

The snowmobile is stopped by braking the en­tire drive system.
Squeeze the brake lever towards the handle­bar grip to stop the snowmobile.

ESU10581

Parking brake lever

When parking the snowmobile or starting the
engine, apply the parking brake by moving the
parking brake lever to the left.

1. Parking brake lever

To release the parking brake, move the park­ing brake lever to the right.

1. Brake lever

When the brake lever is squeezed, the brake
light comes on.

ECS00060

Make sure that the brake lever end does
not project out over the handlebar end.
This will help prevent brake lever damage
when the snowmobile is placed on its side
for service.

ESU10593

Shift lever

The shift lever is used to put the snowmobile
into forward or reverse. After coming to a
complete stop, pull the shift lever out, slide it
to “FWD” or to “REV” until it stops, and then
release it.

23

Control functions

NOTICE

WARNING

NOTICE

1

1

2

3

3

2

1

1. Shift lever

1. Pull out.

2. Slide to “FWD” (forward).

3. Release.

ESU13314

Drive guard

EWS00402

● Coming in contact with the rotating V-

belt or clutch parts can cause severe in­jury or death. Never run the engine with
the drive guard removed.

● Make sure that the drive guard is in-

stalled securely before operating the
snowmobile to protect against severe
injury or death from a broken V-belt or
other part should it come off the snow­mobile while it is in operation.

ECS00930

● Never run the engine with the V-belt re-

moved. Clutch components can be dam­aged.

● Be careful not to scratch the windshield

when removing or installing the drive
guard.

The drive guard is designed to protect the V­belt clutch and V-belt in case parts break or
come loose.
The drive guard is located behind the left side
cover. (See page 54 for removal procedures.)

1. Pull out.

2. Slide to “REV” (reverse).

3. Release.

ECS00072

Do not use the shift lever while the snow­mobile is moving, otherwise the drive train
could be damaged.

24

To remove the drive guard

1. Pull out the drive guard locking pin from
the drive guard rear holder.

NOTICE

1. Drive guard

2

1

1

1

2

1

2. Drive guard locking pin

2. Lift up the rear of the drive guard as
shown, and then pull the guard rearward
to remove it.

Control functions

2. Align the slots in the rear of the drive
guard with the projections on the drive
guard rear holder, and then insert the
drive guard locking pin into the holder as
shown.

1. Drive guard

2. Drive guard locking pin

ESU10761

V-belt holders

Keep a spare V-belt for emergency use by
placing it into the V-belt holders provided.

To install the drive guard

1. Fit the front slots in the drive guard over
the projections on the drive guard front
holder.

1. Drive guard

1. V-belt holder

ECS00180

Make sure that the V-belt is installed se­curely in the holders.

ESU13302

Passenger grips (RST90PGT /
RST90PTF)

The passenger grips can be installed in three
different positions to suit the passenger’s
preference.

25

Control functions

WARNING

NOTICE

2

1

HI

LO

1

3

2

4

2

1

1. Passenger grip

2. Passenger grip adjusting knob

To change the passenger grip posi­tion

1. Remove the passenger grip adjusting
knob by turning it counterclockwise.

2. Move the passenger grip to the desired
position.

3. Install the adjusting knob by turning it
clockwise.

EWS00780

Make sure that the passenger grip adjust­ing knobs are securely tightened after
changing the positions of the passenger
grips.

ESU10681

Passenger grip warmer switch
(RST90PGT / RST90PTF)

The passenger grip warmer switch controls
the electrically heated passenger grips.

1. Passenger grip warmer switch

2. Off

3. “HI” (high)

4. “LO” (low)

ESU14610

Passenger footrests
(RST90PGT / RST90PTF)

The passenger footrests can be installed in
three different positions to suit the passen­ger’s preference.
To change the position of a footrest, remove
the screws, place the footrest in the desired
position, and then install and tighten the
screws.

1. Footrest

2. Screw

ECS00131

● Make sure that the screws are tightened

securely after changing the position of
the footrests.

26

● Do not overtighten the screws, other-

WARNING

2

1

2

1

wise the footrest may be damaged.

ESU14130

Backrest (RST90PGT /
RST90PTF)

EWS00131

Do not sit on the backrest. Otherwise, you
could lose your balance, fall, and be in­jured.

The angle and position of the backrest are ad­justable.

To adjust the backrest angle

Turn the backrest adjusting knob until the
backrest reaches the desired angle.

Control functions

1. Backrest

2. Backrest adjusting lever

When riding without a passenger, the back­rest can be moved to the forward-most posi­tion, and its angle can be adjusted to suit the
operator’s preference as shown.

1. Backrest

2. Backrest adjusting knob

To adjust the backrest position

Pull the backrest adjusting lever upward, and
then move the backrest to the desired posi­tion.

ESU14120

Storage compartment

RS90PLT

The storage compartment is located behind
the seat. Use the storage compartment to
store the tool kit, manuals, spare parts, or oth­er small items.

To open the storage compartment

Turn the fastener 1/2 turn in either direction,
and then fold the storage compartment cover
up.

27

Control functions

NOTICE

TIP

2

1

1

2

1

1. Fastener

2. Storage compartment

To close the storage compartment

Fold the storage compartment cover down,
and then turn the fastener to the original posi­tion.

RST90PGT / RST90PTF

This snowmobile is equipped with a storage
compartment, which includes a storage
pouch.

Storage compartment

ECS00900

The bottom of the storage compartment
may be hot during or immediately after op­erating the snowmobile. It can cause
burns if it becomes extremely hot. Further­more, heat in the storage compartment
can affect the quality of food items, and
deform and discolor plastic items.

The storage compartment is located behind
the seat. Use the storage compartment to
store the storage pouch, spare parts, or other
small items.

To open the storage compartment
Unhook the storage compartment latches and
open the storage compartment lid.

1. Storage compartment latch

2. Storage compartment lid

1. Storage compartment

Before opening the storage compartment lid,
move the backrest forward so that the lid can
be opened. (See page 27 for backrest adjust­ment procedures.)

Maximum load limit:

20 kg (44 lbs)

To close the storage compartment
Close the storage compartment lid, and then
hook the storage compartment latches.

Storage pouch

The storage pouch is located inside the stor­age compartment. Use the storage pouch to
store the tool kit, manuals, spare parts, or oth­er small items.

28

Control functions

NOTICE

NOTICE

TIP

1

1

1

1. Storage pouch

ECS00781

Before starting the engine, make sure that
the tool kit is securely fastened and that
the storage pouch zipper is completely
closed.

ESU13202

Tow hitch [RST90PGT /
RST90PTF (RUSSIA)] and tow
hitch bracket [RST90PGT /
RST90PTF (EUROPE)]

ECS00241

To prevent premature wear of the V-belt,
avoid traveling under 10 km/h (6 mi/h)
when towing for long distances or long pe­riods of time.

Tow hitch [RST90PGT / RST90PTF
(RUSSIA)]

Use the tow hitch within the specified weight
limits.

1. Tow hitch

Tow weight limit:

120 kgf (264 lbf)

Vertical weight limit:

15 kgf (33 lbf)

Tow hitch bracket [RST90PGT /
RST90PTF (EUROPE)]

This snowmobile is equipped with a tow hitch
bracket that is used to install a tow hitch.
Use the tow hitch bracket within the specified
weight limits.

1. Tow hitch bracket

A tow hitch is available at a Yamaha dealer.

Tow weight limit:

120 kgf (264 lbf)

Vertical weight limit:

15 kgf (33 lbf)

29

Control functions

WARNING

WARNING

ESU10618

Fuel

EWS00071

Gasoline and gasoline vapors are ex­tremely flammable. To avoid fires and ex­plosions and to reduce the risk of injury
when refueling, follow these instructions.

Make sure there is sufficient gasoline in the
tank.

1. Before refueling, turn off the engine and
be sure that nobody is on the snowmo­bile. Never refuel while smoking, or while
in the vicinity of sparks, open flames, or
other sources of ignition such as the pilot
lights of water heaters and clothes dry­ers.

2. Do not overfill the fuel tank. Stop filling
when the fuel reaches the bottom of the
filler tube. Because fuel expands when it
heats up, heat from the engine or the sun
can cause fuel to spill out of the fuel tank.

1. Filler tube

2. Maximum fuel level

3. Wipe up any spilled fuel immediately.

4. Be sure the fuel tank cap is closed se­curely by turning it clockwise.

30

EWS00680

Gasoline is poisonous and can cause inju­ry or death. Handle gasoline with care.
Never siphon gasoline by mouth. If you
should swallow some gasoline or inhale a
lot of gasoline vapor, or get some gasoline
in your eyes, see your doctor immediately.
If gasoline spills on your skin, wash with
soap and water. If gasoline spills on your
clothing, change your clothes.

Control functions

NOTICE

WARNING

TIP

WARNING

Recommended fuel:

RS90PLT Min 95 RON UNLEADED
GASOLINE ONLY
RST90PGT Min 91 RON UNLEAD­ED GASOLINE ONLY (RUS)
RST90PGT Min 95 RON UNLEAD­ED GASOLINE ONLY (FIN)(SWE)
RST90PTF Min 91 RON UNLEADED
GASOLINE ONLY (RUS)
RST90PTF Min 95 RON UNLEADED
GASOLINE ONLY (FIN)(SWE)

Fuel tank capacity:

34.6 L (9.14 US gal, 7.61 Imp.gal)

Your Yamaha engine has been designed to
use unleaded gasoline with a research octane
number of 95 or higher. (For Russia, regular
unleaded gasoline with a pump octane num­ber [(R+M)/2] of 86 or higher, or a research
octane number of 91 or higher.)

ECS00094

● Make sure that snow or ice does not en-

ter the fuel tank when refueling.

● The fuel tank should be filled with the

recommended gasoline. The use of oth­er gasoline will cause severe damage to
internal engine parts, such as the valves
and piston rings, as well as to the ex­haust system.

ESU14001

Suspension

The suspension can be adjusted to suit rider
preference. Softer settings, for example, may
provide greater rider comfort, while harder
settings may allow more precise handling and
control over certain types of terrain or riding
conditions.
If you are not familiar with suspension adjust­ments, have a Yamaha dealer make these
adjustments.

EWS00151

Read and understand the following infor­mation before handling shock absorbers
that contain highly pressurized nitrogen
gas.

● Do not tamper with or attempt to open

the cylinder assemblies.

● Do not subject the shock absorbers to

an open flame or other high heat source.
This may cause the unit to explode due
to excessive gas pressure.

● Do not deform or damage the cylinders

in any way. Cylinder damage will result
in poor damping performance.

● Do not dispose of a damaged or worn

out shock absorber yourself. Take the
shock absorber to a Yamaha dealer for
any service.

Use the special wrench included in the own­er’s tool kit to make the suspension adjust­ments. If the tool kit for your model does not
include the special wrench, the special
wrench can be obtained at a Yamaha dealer.

ESU10894

Adjusting the spring preload of the
front shock absorbers

EWS00720

The spring preload of the left and right
shock absorbers must be adjusted to the
same setting. Uneven settings can cause
poor handling and loss of stability.

The spring preload can be adjusted by turning
the adjusting nuts.
Adjust the spring preload as follows.

1. Loosen the locknut.

31

Control functions

TIP

(a)

(b)

1

3

2

(a)

(b)

2

1

3

2. To increase the spring preload and there­by harden the suspension, turn the ad­justing nut in direction (a). To decrease
the spring preload and thereby soften the
suspension, turn the adjusting nut in di­rection (b).

1. Locknut

2. Distance A

3. Spring preload adjusting nut

The spring preload setting is determined by
measuring distance A, shown in the illustra­tion. The longer distance A is, the higher the
spring preload; the shorter distance A is, the
lower the spring preload.

Spring preload setting*:

Minimum (soft):

RS90PLT / RST90PGT /
RST90PTF 122.5 mm (4.82 in)

Standard:

RS90PLT 129.5 mm (5.10 in)
RST90PGT 122.5 mm (4.82 in)
RST90PTF 134.5 mm (5.30 in)

Maximum (hard):

RS90PLT 139.5 mm (5.49 in)
RST90PGT 132.5 mm (5.22 in)
RST90PTF 144.5 mm (5.69 in)

* Distance A changes 1.5 mm (0.06 in)

with each full turn of the adjusting nut.

32

3. Tighten the locknut to the specified
torque. NOTICE: Always tighten the

locknut against the adjusting nut, and
then tighten the locknut to the speci­fied torque.

Tightening torque:

Locknut:

42 Nm (4.2 m·kgf, 30 ft·lbf)

ESU13134

[ECS00860]

Adjusting the spring preload of the
center shock absorber and the rear
torsion springs (RST90PGT /
RST90PTF)

The spring preload can be adjusted by turning
the adjusting nut on the center shock absorb­er and the adjusters on the rear torsion
springs. Adjust the spring preload as follows.

Center shock absorber

1. Loosen the locknut.

2. To increase the spring preload and there­by harden the suspension, turn the ad­justing nut in direction (a). To decrease
the spring preload and thereby soften the
suspension, turn the adjusting nut in di­rection (b).

1. Spring preload adjusting nut

2. Distance A

3. Locknut

TIP

The spring preload setting is determined by

WARNING

(a)

(b)

1

measuring distance A, shown in the illustra­tion. The longer distance A is, the higher the
spring preload; the shorter distance A is, the
lower the spring preload.

Spring preload setting*:

Minimum (soft):

RST90PGT 122.1 mm (4.81 in)
RST90PTF 111.0 mm (4.37 in)

Standard:

RST90PGT 122.1 mm (4.81 in)
RST90PTF 112.0 mm (4.41 in)

Maximum (hard):

RST90PGT 132.1 mm (5.20 in)
RST90PTF 122.0 mm (4.80 in)

* Distance A changes 1.5 mm (0.06 in)

with each full turn of the adjusting nut.

Control functions

1. Spring preload adjuster

Spring preload setting:

Minimum (soft):

S

Standard:

M

Maximum (hard):

H

3. Tighten the locknut to the specified
torque. NOTICE: Always tighten the

locknut against the adjusting nut, and
then tighten the locknut to the speci­fied torque.

Tightening torque:

Locknut:

42 Nm (4.2 m·kgf, 30 ft·lbf)

Rear torsion springs

EWS00750

The left and right spring preloads must be
adjusted to the same setting. Uneven set­tings can cause poor handling and loss of
stability.

To increase the spring preload and thereby
harden the suspension, turn the adjuster in di­rection (a). To decrease the spring preload
and thereby soften the suspension, turn the
adjuster in direction (b).

[ECS00860]

ESU14300

Adjusting the spring preload of the
rear shock absorber (RS90PLT)

The spring preload can be adjusted by turning
the adjusting nut on the rear shock absorber.
Adjust the spring preload as follows.

1. Loosen the locknut.

2. To increase the spring preload and there­by harden the suspension, turn the ad­justing nut in direction (a). To decrease
the spring preload and thereby soften the
suspension, turn the adjusting nut in di­rection (b).

33

Control functions

TIP

(a)

(b)

31

2

(a)

(b)

1

1. Spring preload adjusting nut

2. Distance A

3. Locknut

The spring preload setting is determined by
measuring distance A, shown in the illustra­tion. The longer distance A is, the higher the
spring preload; the shorter distance A is, the
lower the spring preload.

Spring preload setting*:

Minimum (soft):

147.5 mm (5.81 in)

Standard:

157.5 mm (6.20 in)

Maximum (hard):

182.0 mm (7.17 in)

* Distance A changes 1.5 mm (0.06 in)

with each full turn of the adjusting nut.

ESU14310

Adjusting the damping force of the
rear shock absorber (RS90PLT /
RST90PGT)

RST90PGT

The compression damping force can be ad­justed by turning the adjusting knob.
To increase the compression damping force,
turn the adjusting knob in direction (a). To de­crease the compression damping force, turn
the adjusting knob in direction (b). NOTICE:

Do not continue to turn the adjusting knob
in direction (a) after it stops. The shock ab­sorber could be damaged and damping
force adjustments will not be able to be
made. Do not turn the adjusting knob in di­rection (b) more than 12 click(s). Even if
the adjusting knob is continually turned
after 12 click(s), there will be no change in
the damping force. Be sure to stop the ad­justing knob at a position where there is a
click.

[ECS00910]

3. Tighten the locknut to the specified
torque. NOTICE: Always tighten the

locknut against the adjusting nut, and
then tighten the locknut to the speci­fied torque.

Tightening torque:

Locknut:

42 Nm (4.2 m·kgf, 30 ft·lbf)

[ECS00860]

34

1. Compression damping force adjusting knob

Compression damping force setting:

Minimum (soft):

12 click(s) in direction (b)*

Standard:

6 click(s) in direction (b)*

Maximum (hard):

2 click(s) in direction (b)*

* With the adjusting knob fully turned in

direction (a)

Control functions

TIP

TIP

(a)

(b)

1

Min Max

34

5

1

2

RS90PLT

The rebound damping force can be adjusted
by turning the adjusting knob.
To increase the rebound damping force, turn
the adjusting knob in direction (a). To de­crease the rebound damping force, turn the
adjusting knob in direction (b). NOTICE: Do

not continue to turn the adjusting knob in
direction (a) after it stops. The shock ab­sorber could be damaged and damping
force adjustments will not be able to be
made. Do not turn the adjusting knob in di­rection (b) more than 20 click(s). Even if
the adjusting knob is continually turned
after 20 click(s), there will be no change in
the damping force. Be sure to stop the ad­justing knob at a position where there is a
click.

[ECS01060]

ESU11047

Adjusting the control rods

The weight transfer can be adjusted by turn­ing the adjuster on the control rod (RS90PLT)
or the adjusting nuts on the control rods
(RST90PGT / RST90PTF).

RS90PLT

1. Check the control rod length using the
scale on the special wrench as shown.

In order to obtain a precise measurement, the
special wrench corner should touch the con­trol rod adjuster, and the locknut must be
turned so that one of its notches aligns with
the wrench allowing the wrench to fit horizon­tally on the control rod.

1. Rebound damping force adjusting knob

Rebound damping force setting:

Minimum (soft):

20 click(s) in direction (b)*

Standard:

11 click(s) in direction (b)*

Maximum (hard):

3 click(s) in direction (b)*

* With the adjusting knob fully turned in

direction (a)

1. Special wrench corner

2. Control rod adjuster

3. Scale range

4. Special wrench

5. Control rod length

Use the special wrench in the owner’s tool kit
to make this adjustment.

2. Loosen the locknut.

3. To increase weight transfer, turn the ad­juster in direction (a), and to decrease
weight transfer, turn it in direction (b).

WARNING! Never adjust the control
rod beyond the range of the scale on

35

Control functions

TIP

WARNING

1

1

2

(a)

(b)

the special wrench, otherwise the con­trol rod could be damaged, which
could lead to an accident or injury.

[EWS00181]

1. Locknut

2. Control rod adjuster

4. Tighten the locknut while holding the ad­juster in place.

Make sure that the special wrench is securely
fitted on the locknut.

RST90PGT / RST90PTF

EWS00770

The left and right adjusting nuts must be
set to the same position. Uneven settings
can cause poor handling and loss of sta­bility.

1. Loosen the locknut while holding the ad­justing nut.

1. Special wrench

Locknut tightening torque:

35 Nm (3.5 m·kgf, 25 ft·lbf)

36

1. Locknut

2. Control rod adjusting nut

2. To increase weight transfer, turn the ad­justing nut in direction (a), and to de­crease weight transfer, turn it in direction
(b). WARNING! Never adjust the con-

trol rods beyond the maximum set­ting, indicated by red paint; otherwise,
they could be damaged, which could
lead to an accident or injury.

[EWS00173]

Control functions

WARNING

TIP

1

5

2

3

4

1

5

2

3

4

(a)

(b)

1

2

RST90PGT

1. Locknut

2. Control rod adjusting nut

3. Standard position

4. Adjustable range

5. Red paint area

RST90PTF

ESU13113

Adjusting the spring preload of the
sliding frame extension (RST90PTF)

EWS00750

The left and right spring preloads must be
adjusted to the same setting. Uneven set­tings can cause poor handling and loss of
stability.

The spring preload of the sliding frame exten­sion can be adjusted by turning the adjusting
nuts.
To increase the spring preload, turn the ad­justing nut in direction (a). To decrease the
spring preload, turn the adjusting nut in direc­tion (b).

1. Locknut

2. Control rod adjusting nut

3. Standard position

4. Adjustable range

5. Red paint area

3. Tighten the locknut while holding the ad­justing nut in place. NOTICE: Always

tighten the locknut against the adjust­ing nut, and then tighten the locknut to
the specified torque.

Locknut tightening torque:

25 Nm (2.5 m·kgf, 18 ft·lbf)

[ECS00860]

1. Spring preload adjusting nut

2. Distance A

The spring preload setting is determined by
measuring distance A, shown in the illustra­tion. The longer distance A is, the higher the
spring preload; the shorter distance A is, the
lower the spring preload.

37

Control functions

Spring preload setting*:

Minimum (soft):

16 mm (0.63 in)

Standard:

16 mm (0.63 in)

Maximum (hard):

18 mm (0.71 in)

* Distance A changes 1.25 mm (0.05

in) with each full turn of the adjusting
nut.

38

Pre-operation checks

WARNING

ESU11071

Inspect your vehicle each time you use it to make sure the vehicle is in safe operating condition.
Always follow the inspection and maintenance procedures and schedules described in the
Owner’s Manual.

EWS00191

Failure to inspect or maintain the vehicle properly increases the possibility of an acci­dent or equipment damage. Do not operate the vehicle if you find any problem. If a prob­lem cannot be corrected by the procedures provided in this manual, have the vehicle
inspected by a Yamaha dealer.

ESU11081

Pre-operation check list

ITEM CHECKS PAGE

Fuel

Engine oil

Coolant

V-belt

Drive guard

Brake

Air filter

Tool kit and recommended
equipment

Shroud and covers

Skis and ski runners

• Check fuel level.

• Refuel if necessary.

• Check fuel line for leakage.

• Check oil level in engine.

• If necessary, add recommended oil to specified
level.

• Check vehicle for oil leakage.

• Check coolant level.

• Add if necessary.

• Check for wear and damage.

• Replace if necessary.

• Make sure the drive guard is installed securely.

• Check the drive guard mounts for damage.

• Check operation.

• If soft or spongy, have Yamaha dealer bleed hy­draulic system.

• Check brake pads for wear.

• Replace if necessary.

• Check fluid level in master cylinder.

• If necessary, add recommended brake fluid to
specified level.

• Check hydraulic system for leakage.

• Check that there is no snow under the air filter ele­ment.

• If necessary, brush off the snow.

• Check for proper placement. 53, 54

• Make sure that the shroud and covers are securely
fastened.

• Check for wear and damage.

• If necessary, have Yamaha dealer replace skis or
ski runners.

30

67

71

74

24

78

63

54

81

39

Pre-operation checks

ITEM CHECKS PAGE

• Check the deflection.

Drive track

Slide runners

Steering • Check for excessive free play. 83

Lights, signals and switch-es• Check operation.

Throttle lever

Throttle override system
(T.O.R.S.)

• Adjust if necessar y.

• Check for wear and damage.

• If necessary, have a Yamaha dealer replace track.

• Check for wear and damage.

• If necessary, have Yamaha dealer replace slide
runners.

• Correct if necessary.

• Make sure that operation is smooth and spring

back to its original position when released.

• Check the T.O.R.S. for proper operation.

• If system is not functioning properly, have Yamaha

dealer check vehicle.

21, 21, 88, 91

83

83

13

62

40

ESU13502

WARNING

TIP

1
2

Read the Owner’s Manual carefully to be­come familiar with all controls. If there is a
control or function you do not understand, ask
your Yamaha dealer.

EWS00203

Failure to familiarize yourself with the con­trols can lead to loss of control, which
could cause an accident or injury.

ESU13212

This model is equipped with:

● an engine oil pressure switch to stop the en-

gine in case an engine oil pressure drop is
detected. To start the engine after this sys­tem has stopped the engine, be sure to
place the snowmobile on a level surface,
and then turn the key in the main switch to
the off position, and then to the on position.
Failing to do so will prevent the engine from
starting even though the engine will crank
when turning the key to the start position. If
the engine does not start or if it stops again,
ask a Yamaha dealer to inspect the snow­mobile.

● an engine overheating prevention system,

which prevents overheating when the en­gine is idling. When the engine has been
idling for 3 minutes or longer and the cool­ant temperature has risen above 100 °C
(212 °F), the engine automatically stops to
prevent overheating. The engine can be
started after it stops.

ESU11303

Starting the engine

1. Apply the parking brake.

Operation

2. Be sure the engine stop switch is in the
run position. The starter motor cannot be
operated when the engine stop switch is
in the off position.

1. Run position

2. Off position

3. Turn the main switch to the start position
and release it when the engine starts.

NOTICE: Release the switch immedi-

ately after the engine starts. If the en­gine fails to start, release the switch,
wait a few seconds, then try again.
Each attempt should be as short as
possible to preserve the battery. Do
not crank the engine more than 10
seconds on any one attempt.

[ECS00331]

41

Operation

NOTICE

WARNING

1

1. Start

4. Warm up the engine until it runs smooth­ly.

5. Be sure the low coolant temperature indi­cator light has gone out before operation.
(See page 17 for detailed information
about the indicator light.)

ESU11310

Break-in

There is never a more important period in the
life of your engine than the period between 0
and 500 km (300 mi). For this reason, you
should read the following material carefully.
Since the engine is brand new, do not put an
excessive load on it for the first 500 km (300
mi). The various parts in the engine wear and
polish themselves to the correct operating
clearances. During this period, prolonged full­throttle operation or any condition that might
result in engine overheating must be avoided.

Operating your snowmobile for the
first time

Start the engine and let it idle for 15 minutes.

0–160 km (0–100 mi)

Avoid prolonged operation above 6000 r/min.

160–500 km (100–300 mi)

Avoid prolonged operation above 8000 r/min.

500 km (300 mi) and beyond

The snowmobile can now be operated nor­mally.

ECS00340

● After 800 km (500 mi) of operation, the

engine oil must be changed and the oil
filter cartridge replaced.

● If any engine trouble should occur dur-

ing the engine break-in period, immedi­ately have a Yamaha dealer check the
snowmobile.

ESU12625

Riding your snowmobile

Getting to know your snowmobile

EWS00211

To avoid severe injury or death:

● Keep both hands on the handlebar dur-

ing operation.

● Never put your feet outside the running

boards.

● Avoid higher speeds or more difficult

maneuvers until you have become thor­oughly familiar with your snowmobile
and all of its controls.

A snowmobile is a rider active vehicle, and
your riding position and your balance are the
two basic factors of maneuvering your snow­mobile.
Riding your snowmobile requires skills ac­quired through practice over a period of time.
Take the time to learn the basic techniques
well before attempting more difficult maneu­vers.
Riding your new snowmobile can be a very
enjoyable activity, providing you with hours of
pleasure. However, it is essential to familiar­ize yourself with the operation of the snowmo­bile to achieve the skill necessary to enjoy
riding safely. Before operating the snowmo­bile, read this Owner’s Manual completely
and understand the operation of the controls.

42

Operation

WARNING

Pay particular attention to the safety informa­tion on page 8.
Please read all warning and notice labels on
your snowmobile.

Learning to ride your snowmobile

Before you ride, always perform the pre-oper­ation checks listed on page 39. The short time
spent checking the condition of the snowmo­bile will be rewarded with added safety and a
more reliable snowmobile. Always wear the
proper clothing for both warmth and to help
protect you from injury if an accident occurs.
Become familiar with operating your snowmo­bile at low speeds, even if you are an experi­enced rider. Do not attempt to operate at
maximum performance until you are totally fa­miliar with the snowmobile’s handling and
performance characteristics.
The beginning operator should select a large
flat area to become familiar with the snowmo­bile. Make sure that this area is free of obsta­cles and other traffic. You should practice
control of the throttle and brake, and master
turning techniques in this area before trying
more difficult terrain.
Set the parking brake and follow the instruc­tions on page 41 to start the engine. Once the
engine has warmed up, you are ready to be­gin riding your snowmobile.

Braking

EWS00220

● Many surfaces such as ice and hard-

packed snow require much longer stop­ping distances. Be alert, plan ahead, and
begin decelerating early.

● Improper use of the brake can cause the

drive track to lose traction, reduce con­trol, and increase the possibility of an
accident.

When slowing down or stopping, release the
throttle and apply the brake gently—not sud­denly.

Turning

For most snow surfaces, “body English” is the
key to turning.
As you approach a curve, slow down and be­gin to turn the handlebar in the desired direc­tion. As you do so, put your weight on the
running board to the inside of the turn and
lean your upper body into the turn.

To start out and accelerate

1. With the engine idling, release the park­ing brake.

2. Apply the throttle slowly and smoothly.
The V-belt clutch will engage and you will
start to accelerate. WARNING! Do not

allow anyone to stand behind the
snowmobile when starting the engine.
A broken track, track fittings, or debris
thrown by the track could be danger­ous to bystanders.

[EWS00690]

This procedure should be practiced at low
speeds many times, in a large flat area with no
obstacles. Once you have learned this tech­nique, you should be able to perform it at high­er speeds or in tighter curves. Lean more as
the turn gets sharper or is made at higher
speeds.

43

Operation

WARNING

WARNING

Improper riding techniques such as abrupt
throttle changes, excessive braking, incorrect
body movements, or too much speed for the
sharpness of the turn may cause the snow­mobile to tip.
If your snowmobile begins to tip while turning,
lean more into the turn to regain balance. If
necessary, gradually let off on the throttle or
steer to the outside of the turn.

Remember:

Avoid higher speeds until you are thoroughly
familiar with the operation of your snowmo­bile.

Riding uphill

EWS00231

Operation on slopes can lead to loss of
control if proper techniques are not used.
Follow these instructions to reduce your
risk of an accident. Do not try steeper or
more difficult inclines until you have de­veloped your skill on gentle slopes.

You should practice first on gentle slopes. Try
more difficult climbs only after you have de­veloped your skill. As you approach a hill, ac­celerate before you start the climb, and then
reduce the throttle to prevent track slippage. It
is also important to keep your weight on the
uphill side at all times. On climbs straight up
the hill, this can be accomplished by leaning
forward and, on steeper inclines, standing on
the running boards and leaning forward over
the handlebar. (Also see “Traversing a
slope”.)

Slow down as you reach the crest of the hill,
and be prepared to react to obstacles, sharp
drops, or other vehicles or people which may
be on the other side. If you are unable to con­tinue up a hill, do not spin the track. Stop the
engine and set the parking brake. Then pull
the rear of the snowmobile around to point the
snowmobile back down the hill. When the
snowmobile is pointed downhill, mount your
snowmobile from the uphill side. Restart the
engine, release the parking brake, and de­scend the hill.

Riding downhill

EWS00240

Use extra caution when applying the brake
during a descent. Excessive braking will
cause the drive track to lock, causing a
loss of control.

When riding downhill, keep speed to a mini­mum. It is important to apply just enough
throttle to keep the clutch engaged while de­scending the hill. This will allow you to use en­gine compression to help slow the
snowmobile, and to keep the snowmobile
from rolling freely down the hill. Also apply the
brake frequently, with light pressure.

44

Traversing a slope

WARNING

WARNING

EWS00251

Driving across the face of a slope (“side­hilling”) can lead to overturn or loss of
control if proper techniques are not used.
Follow these instructions to reduce your
risk of an accident. Do not try steeper or
more difficult inclines until you have de­veloped your skill on gentle slopes.

Traversing a slope requires you to properly
position your weight to maintain proper bal­ance. As you travel across the slope, lean
your body to position your weight towards the
uphill side. A recommended riding position is
to kneel with the knee of your downhill leg on
the seat and the foot of your uphill leg on the
running board. This position will make it easi­er for you to shift your body weight as needed.

Operation

Snow and ice are slippery, so be prepared for
the possibility that your snowmobile could be­gin to slip sideways on the slope. If this hap­pens, steer in the direction of the slide if there
are no obstacles in your path. As you regain
proper balance, gradually steer again in the
direction you wish to travel.
If your snowmobile starts to tip, steer down
the hill to regain balance. WARNING! If you

are unable to maintain correct balance,
and your snowmobile is going to tip over,
dismount your snowmobile immediately
on the uphill side to avoid being hit or
caught under the snowmobile as it tips
over.

[EWS00261]

Ice or icy surface

EWS00270

When you have to operate on ice or icy
surfaces, drive slowly and cautiously.
Avoid accelerating, turning, and braking
rapidly. Steering is minimal and uncon­trolled spins are an ever-present danger.

Operating on ice or icy surfaces can be very
dangerous. Traction for turning, stopping, and
starting is much less than that on snow.

Hard-packed snow

It can be more difficult to negotiate on hard­packed snow as both the skis and drive track
do not have as much traction as when the
snowmobile is operated on fresh snow. Avoid
rapid acceleration, turning, and braking.

Operation on surfaces other than
snow or ice

Operation of your snowmobile on surfaces
other than snow or ice should be avoided. Op­eration under such conditions will damage or
result in rapid wear of the ski runners, drive

45

Operation

WARNING

NOTICE

track, slide runners, and drive sprockets. Op­eration of the snowmobile on the following
surfaces should be avoided at all times:

● Dirt

● Sand

● Rocks

● Grass

● Bare pavement

Other surfaces that should be avoided for the
sake of drive track and slide runner life are:

● Glare ice surfaces

● Snow mixed with a lot of dirt and sand

All of the above surfaces have one thing in
common in regard to drive track and slide run­ners: little or no lubricating ability. Drive track
and all slide rail systems require lubrication
(snow or water) between the slide runners
and the slide metal. In the absence of lubrica­tion, the slide runners will rapidly wear and in
severe cases, literally melt away, and the
drive track will be subject to damage or failure.
Also traction aids such as studs, cleats, etc.,
may cause further track damage or failure.

EWS00280

Drive track damage or failure could result
in loss of braking ability and snowmobile
control, which could cause an accident.

● Always check the drive track for damage

or maladjustment before operating the
snowmobile.

● Do not operate the snowmobile if you

find damage to the drive track.

ECS00350

Ride on fresh snow frequently. Operating
on ice or hard-packed snow will rapidly
wear the slide runners.

ESU11350

Maximizing drive track life

Recommendations
Track tension

During initial break-in, the new drive track will
tend to stretch quickly as the track settles. Be
sure to correct the track tension and align­ment frequently. (See page 83 for adjustment
procedures.) A loose track can slip (ratchet),
derail or catch on suspension parts causing
severe damage. Do not overtighten the drive
track, otherwise it may increase the friction
between the track and the slide runners, re­sulting in the rapid wear of both components.
Also, this may put an excessive load on the
suspension components, resulting in compo­nent failure.

Marginal snow

The drive track and the slide runners are lubri­cated and cooled by snow and water. To pre­vent the drive track and slide runners from
overheating, avoid sustained high-speed us­age in areas such as icy trails, frozen lakes
and rivers that have minimal snow coverage.
An overheated track will be weakened inter­nally, which may cause failure or damage.

Off-trail riding

Avoid off-trail riding until there is sufficient
snow coverage. It generally takes several feet
of snow to provide a good overall base to
properly cover debris, such as rocks, logs,
etc. If snow coverage is not sufficient, stay on
trails to avoid impact damage to the drive
track.

Studded track

In general, track life will be shortened when
studs are installed. Drilling stud holes into the
drive track will cut the internal fibers, which
weakens the track. Avoid spinning the drive
track. Studs may catch on an object and pull
out of the track, leaving tears and damage

46

around the already weakened area. To mini-

WARNING

WARNING

TIP

TIP

1

2

3

3

2

1

mize possible damage, consult your stud
manufacturer for installation and stud pattern
recommendations.

Yamaha does not recommend track stud­ding.

ESU11395

Driving

EWS00300

Operation

Be sure to read the “SAFETY INFORMA­TION” section on page 8 and the “Riding
your snowmobile” section on page 42
carefully before operating the snowmo­bile.

EWS00310

● Make sure that the throttle lever is fully

released and the snowmobile is at a full
stop before shifting.

● Be sure to slide the shift lever to “FWD”

or “REV” until it stops completely and
only while the engine is idling.

● Make sure that the area behind the

snowmobile is clear before reversing.
Watch behind.

● Reduce speed and avoid sharp turning

when operating the snowmobile in re­verse.

Make sure that the engine is warmed up
enough before riding.

1. To select the desired operating position,
pull the shift lever out, slide it to “FWD” or
to “REV” until it stops, and then release it.

NOTICE: Do not shift from “FWD” to
“REV” or from “REV” to “FWD” while
the snowmobile is moving, as the
drive train could be damaged.

[ECS00811]

1. Pull out.

2. Slide to “FWD” (forward).

3. Release.

1. Pull out.

2. Slide to “REV” (reverse).

3. Release.

The reverse buzzer beeps while the shift lever
is in reverse.

2. While squeezing the brake lever, release
the parking brake by moving the parking
brake lever to the right, and then release
the brake lever.

47

Operation

1

3. Squeeze the throttle lever slowly to start
out.

4. Turn the handlebar in the desired direc­tion.

5. Squeeze the brake lever to stop the
snowmobile.

6. Apply the parking brake by moving the
parking brake lever to the left.

ESU11411

Stopping the engine

● Turn the main switch to the off position to

stop the engine.

1. Off

● Push down the engine stop switch to stop

the engine in an emergency.

ESU11430

Transporting

When transporting your snowmobile on a trail­er or in a truck, observe the following recom­mendations to help protect it from damage:

● If transporting the snowmobile in an open

trailer or truck, put a tight fitting cover on the
snowmobile. A cover specifically designed
for your snowmobile is best. This will help
keep foreign objects out of the cooling
vents, and also help protect the snowmo­bile against damage from debris on the
road.

● If transporting the snowmobile in an open

trailer or truck in areas where road salt is
used, coat metal suspension surfaces light­ly with oil or another protectant. This will
help protect against corrosion. Be sure to
clean the snowmobile when you get to your
destination to remove any corrosive salts.

48

Periodic maintenance and adjustment

WARNING

WARNING

WARNING

ESU11452

Periodic inspection, adjustment, and lubrication will keep your snowmobile in the safest and
most efficient condition possible. Safety is an obligation of the vehicle owner/operator. The
most important points of vehicle inspection, adjustment, and lubrication are explained on the
following pages.

EWS00341

Failure to properly maintain the snowmobile or performing maintenance activities incor­rectly may increase your risk of injury or death during service or while using the snow­mobile. If you are not familiar with snowmobile service, have a Yamaha dealer perform
service.

EWS00700

Turn off the engine when performing maintenance unless otherwise specified.

● A running engine has moving parts that can catch on body parts or clothing, and elec-

trical parts that can cause shocks or fires.

● Running the engine while servicing can lead to eye injury, burns, fire, or carbon mon-

oxide poisoning–possibly leading to death. See page 8 for more information about
carbon monoxide.

EWS00790

Brake discs, calipers, and linings can become very hot during use. To avoid possible
burns, let brake components cool before touching them.

Maintenance, replacement, or repair of the emission control devices and systems may
be performed by any repair establishment or individual that is certified (if applicable).

Proper periodic maintenance of your snowmobile is important in order to enjoy long, pleasur­able use. Especially important are the maintenance services related to emission control. These
controls not only function to ensure cleaner air, but are also vital to proper engine operation and
maximum performance. In the following periodic maintenance charts, the services related to
emission control are grouped separately. These services require specialized data, knowledge,
and equipment. Yamaha dealers are trained and equipped to perform these particular services.

49

Periodic maintenance and adjustment

ESU11461

Periodic maintenance chart for the emission control system

Items marked with an asterisk should be performed by a Yamaha dealer as they require special
tools, data and technical skills.

INITIAL EVERY

Seasonally

or

4000 km

(2500 mi)

(200 hr)

mi)

PAG E

58

66

—

—

—

—

ITEM REMARKS

Spark plugs

* Valve clearance

Crankcase breather

*

system

* Fuel line

* Fuel injection

* Exhaust system

• Check condition.

• Adjust gap and clean.

• Replace if necessary.

• Check and adjust valve clear­ance when engine is cold.

• Check breather hose for cracks
or damage.

• Replace if necessary.

• Check fuel hose for cracks or
damage.

• Replace if necessary.

• Check synchronization.

• Adjust if necessary.

• Check for leakage.

• Tighten or replace gasket if
necessary.

1 month

or 800 km

(500 mi)

(40 hr)

Every 40000 km (25000

50

Periodic maintenance and adjustment

ESU11565

General maintenance and lubrication chart

INITIAL EVERY

ITEM REMARKS

Engine oil

Engine oil filter car-

*

tridge

* Cooling system

Primary and sec-

*

ondary clutches

* Drive chain

* Drive chain oil

* Shift lever

Brake and parking

*

brake

Control cables

Disc brake installa-

*

tion

Extrovert drive

*

sprocket

• Change (warm engine before
draining).

• Replace.

• Check coolant level.

• Bleed the cooling system if
necessary.

• Check engagement and shift
speed.

• Adjust if necessary.

• Inspect sheaves for wear and
damage.

• Inspect weights/rollers and
bushings for wear for primary.

• Inspect ramp shoes/bushings
for wear for secondary.

• Replace if necessary.

• Lubricate with specified
grease.

• Check chain slack.

• Adjust if necessary.

• Check oil level. 77

• Change. 77

• Lubricate with specified
grease.

• Adjust free play and/or replace
pads if necessary.

• Change brake fluid.

• Make sure that operation is
smooth.

• Lubricate if necessary.

• Check for slight free play.

• Lubricate shaft with specified
grease as required.

• Check for wear and damage.

• Replace if necessary.

1 month

or 800 km

(500 mi)

(40 hr)

Whenever operating ele-

Initial at 500 km (300 mi)

and every 800 km (500

See TIP following this

Every 1600 km (1000

Seasonally

or

4000 km

(2500 mi)

(200 hr)

Every

20000 km

(12000 mi)

vation is changed.

mi) thereafter.

chart.

mi)

PAG E

67

67

71

—

—

—

—

77

—

78

78

87

—

81

51

Periodic maintenance and adjustment

TIP

INITIAL EVERY

Seasonally

mi) thereafter.

ITEM REMARKS

* Slide runners

Skis and ski run-

*

ners

* Steering system

* Steering bearings

Skis and front

*

shock absorbers

Suspension compo-

*

nent

* Drive track

Fittings and fasten­ers

* Battery

• Check for wear and damage.

• Replace if necessary.

• Check for wear and damage.

• Replace if necessary.

• Check toe-out.

• Adjust if necessary.

• Check bearing assemblies for
looseness.

• Lubricate with specified
grease.

• Lubricate with specified
grease.

• Lubricate with specified
grease.

• Check the deflection.

• Adjust if necessary.

• Make sure that all nuts, bolts
and screws are properly tight­ened.

• Tighten if necessary.

• Check condition.

• Charge if necessary.

1 month

or 800 km

(500 mi)

(40 hr)

Initial at 500 km (300 mi)

and every 800 km (500

or

4000 km

(2500 mi)

(200 hr)

PAG E

83

81

83

—

87

87

83

91

91

Brake system:

● After disassembling the master cylinder or caliper cylinder, always change the brake fluid.

Regularly check the brake fluid level and add fluid if necessary.

● Replace the oil seals of the master cylinder and caliper cylinder every two years.

● Replace the brake hose every four years, or if cracked or damaged.

52

Periodic maintenance and adjustment

NOTICE

TIP

NOTICE

NOTICE

TIP

1

ESU14112

Tool kit

RS90PLT

The owner’s tool kit is located in the storage
compartment. (See page 27 for information
on how to access the storage compartment.)
The service information included in this man­ual and the tools provided in the owner’s tool
kit are intended to assist you in the perfor­mance of preventive maintenance and minor
repairs. However, additional tools such as a
torque wrench may be necessary to perform
certain maintenance work correctly.

1. Tool kit

ECS00360

The service information included in this man­ual and the tools provided in the owner’s tool
kit are intended to assist you in the perfor­mance of preventive maintenance and minor
repairs. However, additional tools such as a
torque wrench may be necessary to perform
certain maintenance work correctly.

1. Tool kit

ECS00781

Before starting the engine, make sure that
the tool kit is securely fastened and that
the storage pouch zipper is completely
closed.

ECS00940

Before starting the engine, make sure that
the tool kit is properly seated in its holder
and is securely fastened.

If you do not have a torque wrench available
during a service operation requiring one, take
your snowmobile to a Yamaha dealer to
check the torque settings and adjust them if
necessary.

RST90PGT / RST90PTF

The owner’s tool kit is located in the storage
pouch. (See page 27 for information on how
to access the storage compartment.)

● Be sure to slide the covers onto the

short end of each hexagon wrench be­fore placing the wrenches in the tool kit.

● Securely tie the strap around the tool kit.

If you do not have a torque wrench available
during a service operation requiring one, take
your snowmobile to a Yamaha dealer to
check the torque settings and adjust them if
necessary.

53

Periodic maintenance and adjustment

WARNING

1

2

34

3

2

1

1. Hexagon wrench cover

2. Hexagon wrench

3. Tool kit

4. Strap

ESU14230

Recommended equipment

It is good practice to carry the spare parts and
other necessary equipment with you while
riding the snowmobile so that minor repairs
can be done if necessary. The following
should be carried at all times:

● Flashlight

● Roll of plastic tape

● Steel wire

● Tow rope

● V-belt

● Light bulbs

When you start out for a long distance trip, ex­tra fuel should be carried as well.

ESU14143

Removing and installing the shroud and covers

EWS00091

Be sure shroud and covers are secured
before operation. A loose shroud or cover
could move and cause loss of control.

1. Fastener

2. Shroud

3. Shroud stay

To install the shroud
Hook the end of the shroud onto the shroud
stay, slowly lower it to the original position,
and then tighten the fasteners.

1. Shroud stay

Left and right side covers

To remove a side cover

1. Remove the shroud. (See the above pro­cedure.)

2. Loosen the fasteners, pull outward on the
areas shown, and then slide the side cov­er forward to remove it.

Shroud

To remove the shroud
Loosen the fasteners, slowly raise the shroud,
and then unhook the shroud from the shroud
stay.

54

Periodic maintenance and adjustment

1

2

1

1

2

1. Fastener

2. Left side cover

To install a side cover

1. Fit the projection on the rear of the side
cover into the hole in the fuel tank cover.

Top cover (RS90PLT)

To remove the top cover

1. Remove the shroud and the left side cov­er. (See the above procedures.)

2. Disconnect the auxiliary DC jack coupler.

1. Auxiliary DC jack coupler

3. Remove the screws, and then remove
the cable guide.

2. Fit the projections on the side cover into
the slots as shown.

3. Tighten the fasteners.

4. Install the shroud.

1. Screw

2. Cable guide

4. Loosen the quick fastener screws.

55

Periodic maintenance and adjustment

NOTICE

2

1

1

1

1. Quick fastener screw

2. Top cover

5. Lift up the rear of the top cover, discon­nect the main switch coupler, and then
remove the cover.

1. Top cover

2. Main switch coupler

To install the top cover

1. Connect the main switch coupler.

2. Place the top cover in the original posi­tion, making sure to fit the projections on
the cover into the slots in the headlight
unit.

1. Top cover

3. Tighten the quick fastener screws.

4. Pass the brake hose, throttle cable, park­ing brake cable and wire harness through
the cable guide, place the cable guide in
the original position, and then install the
screws.

1. Cable guide

5. Connect the auxiliary DC jack coupler.

6. Install the left side cover and the shroud.

ECS00372

● Make sure that all cables, hoses and

leads are routed properly before install­ing the shroud and covers.

● When installing the shroud and covers,

be sure to tighten the fasteners secure­ly.

56

Periodic maintenance and adjustment

1

1

2

1

1

2

Top cover (RST90PGT / RST90PTF)

To remove the top cover

1. Remove the shroud and the left side cov­er. (See the above procedures.)

2. Disconnect the auxiliary DC jack coupler.

1. Auxiliary DC jack coupler

3. Remove the screws, and then remove
the cable guide.

1. Windshield stay rubber cover

5. Loosen the quick fastener screws.

6. Lift up the rear of the top cover, discon­nect the main switch coupler, and then
remove the cover.

1. Screw

2. Cable guide

4. Pull the windshield stay rubber covers
upward.

1. Top cover

2. Main switch coupler

To install the top cover

1. Connect the main switch coupler.

2. Place the top cover in the original posi­tion, making sure to fit the projections on
the cover into the slots in the headlight
unit.

57

Periodic maintenance and adjustment

NOTICE

WARNING

could indicate an intake track air leak or car­buretion problem for that cylinder. Do not at­tempt to diagnose such problems yourself.
Instead, take the snowmobile to a Yamaha
dealer for inspection and possible repairs.
You should periodically remove and inspect
the spark plugs because heat and deposits
will cause any spark plug to slowly break
down and erode. Consult a Yamaha dealer
before changing to a different type of spark

3. Tighten the quick fastener screws.

4. Place the windshield stay rubber covers
in their original position.

5. Pass the brake hose, throttle cable, park­ing brake cable and wire harness through
the cable guide, place the cable guide in
the original position, and then install the
screws.

6. Connect the auxiliary DC jack coupler.

7. Install the left side cover and the shroud.

ECS00372

plug.

Specified spark plug:

Manufacturer:

NGK

Model:

CR8E

EWS00710

Be sure to use the specified spark plug
and spark plug cap. Otherwise, the
T.O.R.S. may not work properly.

● Make sure that all cables, hoses and

leads are routed properly before install­ing the shroud and covers.

● When installing the shroud and covers,

be sure to tighten the fasteners secure­ly.

ESU11784

Checking the spark plugs

The spark plugs are important engine compo­nents and are easy to inspect. The condition
of the spark plugs can indicate the condition of
the engine.
Check the coloration on the white porcelain
insulator around the center electrode. The
ideal coloration at this point is a medium-to­light tan color for a snowmobile that is being
ridden normally. If any spark plug shows a
distinctly different color, there could be some­thing wrong with the engine. For example, a
very white center electrode porcelain color

58

Spark plugs are produced in several different
thread lengths. The thread length or reach is
the distance from the spark plug gasket seat
to the end of the threaded portion. If the reach
is too long, overheating and engine damage
may result. If the reach is too short, spark plug
fouling and poor performance may result. Al­so, if the reach is too short, carbon will form on
the exposed threads resulting in combustion
chamber hot spots and thread damage. Al­ways use a spark plug with the specified
reach.

Spark plug reach:

19.0 mm (0.75 in)

Periodic maintenance and adjustment

NOTICE

1

1

1. Spark plug gap

2. Spark plug reach

Before installing any spark plug, measure the
spark plug gap with a wire thickness gauge
and adjust to specification.

Spark plug gap:

0.7–0.8 mm (0.028–0.031 in)

When installing the spark plug, always clean
the gasket surface. Wipe off any grime from
the threads and tighten the spark plug to the
specified torque.

3. Remove the headlight unit bolt on each
side of the snowmobile.

1. Headlight unit bolt

4. Unhook the headlight unit as shown, then
lift it up and move it forward, away from
the handlebar. NOTICE: Be careful not

to scratch the snowmobile when mov­ing the headlight unit.

[ECS00920]

Spark plug tightening torque:

13 Nm (1.3 m·kgf, 9.4 ft·lbf)

ECS00382

Make sure that the spark plug caps are se­curely installed. Otherwise the spark plug
caps could be damaged due to engine vi­bration.

ESU14531

Adjusting the throttle lever free play

RS90PLT

1. Place the snowmobile on a level surface
and apply the parking brake.

2. Remove the shroud, the left and right
side covers, and the top cover. (See page
54 for removal procedures.)

1. Headlight unit

5. Loosen the locknut.

6. To increase the throttle lever free play,
turn the adjusting bolt in direction (a). To
decrease the throttle lever free play, turn
the adjusting bolt in direction (b).

59

Periodic maintenance and adjustment

3

1

2

(a)

(b)

1

2

1

9. Fit the weatherstrip on the headlight unit
into the recess in the top of the air filter
case cover.

1. Weatherstrip

10. Install the headlight unit bolts, and then
tighten them to the specified torque.

Tightening torque:

Headlight unit bolt:

3.0 Nm (0.30 m·kgf, 2.2 ft·lbf)

1. Locknut

2. Throttle lever free play adjusting bolt

3. Throttle lever free play

Throttle lever free play:

2.0–3.0 mm (0.08–0.12 in)

7. Tighten the locknut.

8. Install the headlight unit, making sure to
fit the slots on its bottom onto the projec­tions on its stay.

1. Slot

2. Projection

60

11. Install the top cover, the left and right side
covers, and the shroud.

RST90PGT / RST90PTF

1. Place the snowmobile on a level surface
and apply the parking brake.

2. Remove the shroud, the left and right
side covers, and the top cover. (See page
54 for removal procedures.)

3. Remove the headlight unit bolt and the
windshield stay bolts on each side of the
snowmobile.

Periodic maintenance and adjustment

1

2

1

3

2

1

(a)

(b)

1

2

1. Headlight unit bolt

2. Windshield stay bolt

4. Unhook the headlight unit as shown, then
lift it up and move it forward, away from
the handlebar. NOTICE: Be careful not

to scratch the snowmobile when mov­ing the headlight unit.

1. Headlight unit

5. Loosen the locknut.

6. To increase the throttle lever free play,
turn the adjusting bolt in direction (a). To
decrease the throttle lever free play, turn
the adjusting bolt in direction (b).

[ECS00920]

1. Locknut

2. Throttle lever free play adjusting bolt

3. Throttle lever free play

Throttle lever free play:

2.0–3.0 mm (0.08–0.12 in)

7. Tighten the locknut.

8. Install the headlight unit, making sure to
fit the slots on its bottom onto the projec­tions on its stay.

1. Slot

2. Projection

9. Fit the weatherstrip on the headlight unit
into the recess in the top of the air filter
case cover.

61

Periodic maintenance and adjustment

WARNING

TIP

1

1. Weatherstrip

10. Install the headlight unit bolts and wind­shield stay bolts, and then tighten them to
their specified torques.

Tightening torques:

Headlight unit bolt:

3.0 Nm (0.30 m·kgf, 2.2 ft·lbf)

Windshield stay bolt:

14 Nm (1.4 m·kgf, 10 ft·lbf)

11. Install the top cover, the left and right side
covers, and the shroud.

ESU11863

Checking the throttle override system (T.O.R.S.)

EWS00352

When checking the T.O.R.S., take precau­tions to avoid snowmobile movement
which could cause an accident:

● Make sure that the throttle lever moves

smoothly with the engine off before
checking the T.O.R.S.

● Make sure that the parking brake is ap-

plied.

● Do not rev the engine to the point that

the clutch engages.

Check the T.O.R.S. for proper operation.

1. Start the engine.

Refer to the “Starting the engine” section on
page 41.

2. Hold the pivot point of the throttle lever
away from the throttle switch by putting
your thumb (above) and forefinger (be­low) between the throttle lever pivot and
the engine stop switch housing.
While holding the pivot point as described
above, squeeze the throttle lever gradu­ally.

62

Periodic maintenance and adjustment

1

1

1. Throttle lever pivot

2. Engine stop switch housing

3. Throttle lever

The T.O.R.S. will be activated and the
engine speed will be limited to less than
the clutch engagement speed. (See page
103 for the clutch engagement speed.)

WARNING! If the engine speed does
not decrease to less than the clutch
engagement speed, stop the engine
by turning the main switch to the off
position and consult a Yamaha dealer.
Operating the snowmobile with a mal­functioning T.O.R.S. could result in
loss of control.

ESU14541

Checking the air filter

Check that there is no snow under the air filter
element frame after each ride. In addition,
snow may need to be cleaned during a ride
depending on the riding conditions.

[EWS00362]

RS90PLT

1. Place the snowmobile on a level surface
and apply the parking brake.

2. Remove the shroud, the left and right
side covers, and the top cover. (See page
54 for removal procedures.)

3. Remove the headlight unit bolt on each
side of the snowmobile.

1. Headlight unit bolt

4. Unhook the headlight unit as shown, then
lift it up and move it rearward, away from
the air filter case cover. NOTICE: Be

careful not to scratch the snowmobile
when moving the headlight unit.

[ECS00920]

1. Headlight unit

5. Remove the air filter case cover by un­hooking the fasteners.

63

Periodic maintenance and adjustment

1

1

1

1

2

1

8. Install the headlight unit, making sure to
fit the slots on its bottom onto the projec­tions on its stay.

1. Air filter case cover fastener

6. Lift up the air filter element frame and
check the air filter element. If there is any
snow on the air filter element, remove the
element, brush off the snow, and then in­stall the air filter element.

1. Slot

2. Projection

9. Fit the weatherstrip on the headlight unit
into the recess in the top of the air filter
case cover.

1. Air filter element frame

7. Place the air filter element frame in the
original position, and then install the air
filter case cover by hooking the fasteners.

64

1. Weatherstrip

10. Install the headlight unit bolts, and then
tighten them to the specified torque.

Tightening torque:

Headlight unit bolt:

3.0 Nm (0.30 m·kgf, 2.2 ft·lbf)

11. Install the top cover, the left and right side
covers, and the shroud.

RST90PGT / RST90PTF

1. Place the snowmobile on a level surface
and apply the parking brake.

Periodic maintenance and adjustment

1

2

1

1

1

1

2. Remove the shroud, the left and right
side covers, and the top cover. (See page
54 for removal procedures.)

3. Remove the headlight unit bolt and the
windshield stay bolts on each side of the
snowmobile.

1. Headlight unit bolt

2. Windshield stay bolt

4. Unhook the headlight unit as shown, then
lift it up and move it rearward, away from
the air filter case cover. NOTICE: Be

careful not to scratch the snowmobile
when moving the headlight unit.

[ECS00920]

1. Air filter case cover fastener

6. Lift up the air filter element frame and
check the air filter element. If there is any
snow on the air filter element, remove the
element, brush off the snow, and then in­stall the air filter element.

1. Headlight unit

5. Remove the air filter case cover by un­hooking the fasteners.

1. Air filter element frame

7. Place the air filter element frame in the
original position, and then install the air
filter case cover by hooking the fasteners.

65

Periodic maintenance and adjustment

1

2

1

8. Install the headlight unit, making sure to
fit the slots on its bottom onto the projec­tions on its stay.

1. Slot

2. Projection

9. Fit the weatherstrip on the headlight unit
into the recess in the top of the air filter
case cover.

1. Weatherstrip

10. Install the headlight unit bolts and wind­shield stay bolts, and then tighten them to
their specified torques.

Tightening torques:

Headlight unit bolt:

3.0 Nm (0.30 m·kgf, 2.2 ft·lbf)

Windshield stay bolt:

14 Nm (1.4 m·kgf, 10 ft·lbf)

11. Install the top cover, the left and right side
covers, and the shroud.

ESU11931

High-altitude settings

Operating at high altitude reduces the perfor­mance of a gasoline engine about 3% for ev­ery 305 m (1000 ft) of elevation. This is
because there is less air as altitude increases.
Less air means less oxygen available for
combustion.
Your snowmobile utilizes an electronic fuel in­jection system that delivers the optimal air/fu­el ratio required by the engine. Therefore, the
fuel injection system does not need to be ad­justed, even for operation at high altitude.

Remember:

Less air at higher altitude means there is less
horsepower available, even with the optimal
air/fuel ratio. Expect acceleration and top
speed to be reduced at higher altitudes.
To overcome operating with less power at
high altitudes, your snowmobile may also re­quire different settings for the drive chain
gears and V-belt clutch to avoid poor perfor­mance and rapid wear. If you plan to operate
your snowmobile at an altitude different from
the area where you bought it, be sure to con­sult a Yamaha dealer. The dealer can tell you
if there are any changes necessary for the al­titude where you plan to ride. NOTICE: The

drive chain gears and V-belt clutch should
be adjusted when operating above a high
altitude of 900 m (3000 ft). Consult a
Yamaha dealer.

ESU11950

[ECS00431]

Valve clearance

The valve clearance changes with use, result­ing in improper air-fuel mixture and/or engine
noise. To prevent this from occurring, the
valve clearance must be adjusted by a
Yamaha dealer at the intervals specified in
the periodic maintenance chart.

66

Periodic maintenance and adjustment

WARNING

NOTICE

TIP

2

1

ESU14550

Engine oil and oil filter cartridge

The engine oil level should be checked before
each use. In addition, the oil must be changed
and the oil filter cartridge replaced at the inter­vals specified in the periodic maintenance
and lubrication chart.

EWS00370

Engine oil is extremely hot immediately af­ter the engine is turned off. Coming into
contact with or getting any engine oil on
your clothes could result in burns.

ECS00482

● Do not run the engine with too much or

not enough oil in the oil tank. Oil could
spray out or the engine could be dam­aged.

● Be sure to change the engine oil after

the first 800 km (500 mi) of operation,
and every 4000 km (2500 mi) thereafter
or at the start of a new season, other­wise the engine will wear quickly.

● The oil filter cartridge should be re-

placed after the first 800 km (500 mi) of
operation, and every 20000 km (12000
mi) of operation thereafter.

To check the engine oil level

1. Place the snowmobile on a level surface
and apply the parking brake.

2. Start the engine, warm it up for 10–15
minutes, and then turn it off.

● The engine can also be warmed up by driv-

ing the snowmobile for 10–15 minutes.

● After operating the snowmobile, allow the

engine to idle for at least 10 seconds before
turning it off.

3. Remove the shroud and the right side
cover (See page 54 for removal proce­dures).

4. Disconnect the oil level gauge coupler.

NOTICE: Disconnect the oil level

gauge coupler before removing the oil
filler cap, otherwise the cable could
twist and break.

1. Oil level gauge coupler

2. Oil filler cap

[ECS00452]

5. Remove the oil filler cap, wipe the dipstick
clean, insert it back into the oil filler hole
(without screwing it in), and then remove
it again to check the oil level.

67

Periodic maintenance and adjustment

TIP

21

1

3

2

1

To change the engine oil (with or with­out oil filter cartridge replacement)

1. Place the snowmobile on a level surface
and apply the parking brake.

2. Start the engine, warm it up for several
minutes, and then turn it off.

3. Remove the shroud, the right side cover,
and the top cover (See page 54 for re­moval procedures).

1. Oil filler cap

2. Dipstick

The engine oil should be between the “H” and
“L” level marks on the dipstick.

1. “H” level mark

2. “L” level mark

6. If the engine oil is below the “L” level
mark, add sufficient oil of the recom­mended type to raise it to the “H” level
mark. (See page 103 for the recommend­ed oil.) NOTICE: When adding the en-

gine oil, be careful not to fill above the
“H” level mark on the dipstick. Use
only the recommended oil. (See page

103.) Make sure that no foreign materi­al enters the engine oil tank.

7. Insert the dipstick into the oil filler hole,
and then tighten the oil filler cap.

8. Connect the oil level gauge coupler.

9. Install the right side cover and the shroud.

[ECS00462]

4. Remove the screws and the bolts, and
then pull the right lower cover outward to
remove it.

1. Screw

2. Bolt

3. Right lower cover

5. Remove the bottom panel by removing
the bolts.

1. Bolt

2. Bottom panel

6. Place an oil pan under the oil tank to col­lect the used oil.

7. Disconnect the oil level gauge coupler.

68

Periodic maintenance and adjustment

TIP

TIP

2

1

1

1

2

10. Remove the engine oil drain bolt and its
gasket to drain the oil from the crank­case.

1. Oil level gauge coupler

2. Oil filler cap

8. Remove the oil filler cap and the cylinder
head cap, and then remove the engine oil
drain bolt and its gasket to drain the oil
from the oil tank.

1. Cylinder head cap

2

3

1

1. Engine oil drain bolt (crankcase)

2. Gasket

3. “ ” mark

● A “ ” mark is stamped on the crankcase

near the engine oil drain bolt for easy iden­tification.

● Dispose of used oil according to local regu-

lations.

● Skip steps 11–13 if the oil filter cartridge is

not being replaced.

11. Remove the oil filter cartridge with an oil
filter wrench.

1. Engine oil drain bolt (oil tank)

2. Gasket

9. Place an oil pan under the engine to col­lect the used oil.

1

1. Oil filter cartridge

An oil filter wrench is available at a Yamaha
dealer.

69

Periodic maintenance and adjustment

TIP

1

2

12. Apply a thin coat of engine oil to the O­ring of the new oil filter cartridge.

1. O-ring

Make sure that the O-ring is properly seated.

13. Install the new oil filter cartridge with an
oil filter wrench, and then tighten it to the
specified torque.

Tightening torque:

Oil filter cartridge:

17 Nm (1.7 m·kgf, 12 ft·lbf)

14. Install the engine oil drain bolts and their
new gasket, and then tighten the bolts to
the specified torques.

Tightening torques:

Engine oil drain bolt (crankcase):

10 Nm (1.0 m·kgf, 7.2 ft·lbf)

Engine oil drain bolt (oil tank):

16 Nm (1.6 m·kgf, 12 ft·lbf)

15. Add 2.0 L (2.11 US qt, 1.76 Imp.qt) of the
recommended engine oil to the oil tank,
and then install and tighten the oil filler
cap and the cylinder head cap.

Recommended engine oil:

See page 103.

16. Start the engine, warm it up for several
minutes, and then turn it off.

70

17. Remove the oil filler cap, and then add
sufficient oil of the recommended type to
raise it to the “H” level mark on the dip­stick. NOTICE: When adding the en-

gine oil, be careful not to fill above the
“H” level mark on the dipstick. Use
only the recommended oil. (See page

103.) Make sure that no foreign materi­al enters the engine oil tank.

1. “H” level mark

2. “L” level mark

Recommended engine oil:

See page 103.

Oil quantity:

With oil filter cartridge replacement:

3.3 L (3.49 US qt, 2.90 Imp.qt)
Without oil filter cartridge replace­ment:

3.1 L (3.28 US qt, 2.73 Imp.qt)

Total amount:

4.0 L (4.23 US qt, 3.52 Imp.qt)

18. Install and tighten the oil filler cap.

19. Start the engine, and then let it idle for
several minutes while checking it for oil
leakage. If oil is leaking, immediately turn
the engine off and make sure that the en­gine oil drain bolts, the cylinder head cap,
and the oil filler cap are installed correct­ly.

20. Turn the engine off, and then connect the
oil level gauge coupler. NOTICE: If oil is

leaking or the oil level warning indica­tor comes on when the engine is run-

[ECS00462]

Periodic maintenance and adjustment

WARNING

1

1

1

ning, immediately turn the engine off
and have a Yamaha dealer check the
snowmobile. Continuing to operate
the engine under such conditions
could cause severe engine damage.

[ECS00471]

21. Place the bottom panel in the original po­sition, and then install the bolts.

22. Place the right lower cover in the original
position, and then install the screws and
the bolts.

1. Right lower cover

23. Install the top cover, the right side cover,
and the shroud.

ESU14562

Cooling system

The coolant level should be checked before
each ride. In addition, the cooling system
must be bled at the intervals specified in the
periodic maintenance and lubrication chart.

EWS00380

Do not remove the coolant reservoir cap
when the engine is hot. Scalding hot fluid
and steam may be blown out under pres­sure, which could cause serious injury.
When the engine has cooled, place a thick
rag or towel over the coolant reservoir
cap, and slowly rotate the cap counter­clockwise to the detent. This procedure al­lows any residual pressure to escape.

When the hissing sound has stopped,
press down on the cap while turning coun­terclockwise and remove it.

RS90PLT

1. Coolant reservoir cap

RST90PGT / RST90PTF

1. Coolant reservoir cap

RS90PLT
To check the coolant level

1. Place the snowmobile on a level surface
and apply the parking brake.

2. Remove the top cover and the right side
cover. (See page 54 for removal proce­dures.)

3. Check the coolant level in the coolant re­covery tank when the engine is cold. If the
coolant level is below the “COLD LEVEL”
mark, add coolant until it reaches the
“COLD LEVEL” mark. (See the following
section “Replenishing the coolant” for
more details.) NOTICE: If coolant is not

71

Periodic maintenance and adjustment

NOTICE

121

2

1

2

available, use distilled water or soft
tap water instead. Do not use hard wa­ter or salt water since it is harmful to
the engine. If water has been used in­stead of coolant, replace it with cool­ant as soon as possible, otherwise the
cooling system will not be protected
against frost and corrosion. If water
has been added to the coolant, have a
Yamaha dealer check the antifreeze
content of the coolant as soon as pos­sible, otherwise the effectiveness of
the coolant will be reduced.

1. Coolant recovery tank

2. “COLD LEVEL” mark

4. Install the top cover and the right side
cover.

[ECS00492]

2. Remove the top cover and the right side
cover. (See page 54 for removal proce­dures.)

3. Remove the coolant reservoir cap, fill the
reservoir with the recommended coolant,
and then install the cap.

1. Coolant reservoir cap

2. Coolant recovery tank cap

4. Remove the coolant recovery tank cap,
add the recommended coolant until it
reaches the “COLD LEVEL” mark, and
then install the cap.

Bleeding the cooling system

The cooling system must be bled if the cool­ant reservoir becomes empty, if air can be
seen in the cooling system, or if there is a
cooling system leak. Consult a Yamaha deal­er.

ECS00500

Operating the engine with an improperly
bled cooling system can cause overheat­ing and severe engine damage.

Replenishing the coolant

1. Place the snowmobile on a level surface
and apply the parking brake.

72

Recommended antifreeze:

High-quality ethylene glycol antifreeze
containing corrosion inhibitors

Antifreeze and water mixing ratio:

3:2

Total amount:

RS90PLT 6.10 L (6.45 US qt,

5.37 Imp.qt)

5. Start the engine, allow it to idle for several
minutes, and then turn it off.

Periodic maintenance and adjustment

TIP

NOTICE

1

6. Check for any coolant leakage. If coolant
is leaking, check for the cause.

If you find any leaks, consult a Yamaha deal­er.

7. Check the coolant level in the coolant
reservoir. If it is not full, remove the cool­ant reservoir cap, fill the reservoir with the
recommended coolant, and then install
the cap.

8. Install the top cover and the right side
cover.

RST90PGT / RST90PTF
To check the coolant level

1. Place the snowmobile on a level surface
and apply the parking brake.

2. Remove the shroud and the right side
cover (See page 54 for removal proce­dures.)

3. Check the coolant level in the coolant
reservoir when the engine is cold. If the
coolant level is below the “COLD LEVEL”
mark, add coolant until it reaches the
“COLD LEVEL” mark. (See the following
section “Replenishing the coolant” for
more details.) NOTIC E: If coolant is not

available, use distilled water or soft
tap water instead. Do not use hard wa­ter or salt water since it is harmful to
the engine. If water has been used in­stead of coolant, replace it with cool­ant as soon as possible, otherwise the
cooling system will not be protected
against frost and corrosion. If water
has been added to the coolant, have a
Yamaha dealer check the antifreeze
content of the coolant as soon as pos­sible, otherwise the effectiveness of
the coolant will be reduced.

[ECS00492]

1. “COLD LEVEL” mark

4. Install the right side cover and the shroud.

Bleeding the cooling system

The cooling system must be bled if the cool­ant reservoir becomes empty, if air can be
seen in the coolant reservoir, or if there is a
cooling system leak. Consult a Yamaha deal­er.

ECS00500

Operating the engine with an improperly
bled cooling system can cause overheat­ing and severe engine damage.

Replenishing the coolant

1. Place the snowmobile on a level surface
and apply the parking brake.

2. Remove the shroud, the right side cover,
and the top cover (See page 54 for re­moval procedures.)

3. Remove the coolant reservoir cap and
add coolant until it reaches the “COLD
LEVEL” mark.

73

Periodic maintenance and adjustment

TIP

WARNING

NOTICE

2

1

8. Install the top cover, the right side cover,
and the shroud.

ESU14571

V-belt

EWS00402

● Coming in contact with the rotating V-

belt or clutch parts can cause severe in­jury or death. Never run the engine with
the drive guard removed.

1. “COLD LEVEL” mark

2. Coolant reservoir cap

● Make sure that the drive guard is in-

stalled securely before operating the
snowmobile to protect against severe
injury or death from a broken V-belt or
other part should it come off the snow­mobile while it is in operation.

ECS00830

Never run the engine with the V-belt re­moved. Clutch components can be dam­aged.

Recommended antifreeze:

High-quality ethylene glycol antifreeze
containing corrosion inhibitors

Antifreeze and water mixing ratio:

3:2

Total amount:

5.40 L (5.71 US qt, 4.75 Imp.qt)

4. Start the engine and add coolant until the
coolant level stabilizes, and then stop the
engine.

5. Check for any coolant leakage. If coolant
is leaking, check for the cause.

If you find any leaks, consult a Yamaha deal­er.

6. Fill the coolant reservoir with coolant until
it reaches the “COLD LEVEL” mark.

7. Install the coolant reservoir cap.

74

The V-belt should be checked before each
ride.

To check the V-belt

1. Remove the shroud and the left side cov­er, and then remove the drive guard.
(See page 24 for drive guard removal
procedures.)

2. Check the V-belt for wear and damage.
Replace if necessary.

1. V-belt wear limit

Periodic maintenance and adjustment

WARNING

NOTICE

21

1

3

New V-belt width:

34.5 mm (1.36 in)

V-belt wear limit width:

32.5 mm (1.28 in)

3. Install the drive guard, and then install the
left side cover and the shroud.

To replace and adjust the V-belt

EWS00411

When installing a new V-belt, make sure
that it is positioned properly. Otherwise,
the V-belt clutch engagement speed will
be changed and the snowmobile may
move unexpectedly when the engine is
started, which could cause an accident.

ECS00511

As the V-belt wears, the position of the V­belt will change. If the V-belt position is out
of specification, it must be adjusted to en­sure proper clutch performance.
Have a Yamaha dealer make this adjust­ment.

1. Place the snowmobile on a level surface
and apply the parking brake.

2. Remove the shroud and the left side cov­er, and then remove the drive guard.
(See page 24 for drive guard removal
procedures.)

3. Remove the screws and the bolts, and
then pull the left lower cover outward to
remove it.

1. Screw

2. Bolt

3. Left lower cover

4. Rotate the secondary sliding sheave
clockwise and push it so that it separates
from the secondary fixed sheave.

1. Secondary sliding sheave

2. Secondary fixed sheave

5. Pull the V-belt up over the secondary
fixed sheave.

1. V-belt

75

Periodic maintenance and adjustment

2

1

6. Remove the V-belt from the secondary
sheave assembly and primary sheave
assembly.

7. Temporarily install the new V-belt on the
secondary sheave assembly only, and
then measure the V-belt position. Do not
force the V-belt between the sheaves; the
secondary sliding and fixed sheaves
must touch each other.

1. V-belt position adjusting bolt

2. Spacer

1. Edge of the secondary sheave assembly

2. Standard V-belt position

Standard V-belt position:

From 1.5 mm (0.06 in) above the
edge of the secondary sheave as­sembly to 0.5 mm (0.02 in) below the
edge

8. If the V-belt position is incorrect, adjust it
by removing or adding a spacer on each
V-belt position adjusting bolt.

76

V-belt position Adjustment

More than 1.5 mm
(0.06 in) above the
edge

From 1.5 mm (0.06 in)
above the edge to 0.5
mm (0.02 in) below
the edge

More than 0.5 mm
(0.02 in) below the
edge

Remove a spacer.

Not necessary (it is
correct).

Add a spacer.

9. Tighten the V-belt position adjusting
bolts.

V-belt position adjusting bolt tightening
torque:

10 Nm (1.0 m·kgf, 7.2 ft·lbf)

10. Install the V-belt over the primary sheave
assembly.

Periodic maintenance and adjustment

1

1

11. Rotate the secondary sliding sheave
clockwise and push it so that it separates
from the secondary fixed sheave.

1. Secondary sliding sheave

2. Secondary fixed sheave

12. Install the V-belt between the secondary
sliding and fixed sheaves.

1. V-belt

13. Place the left lower cover in the original
position, and then install the screws and
the bolts.

14. Install the drive guard, and then install the
left side cover and the shroud.

ESU12106

Drive chain housing

To check the drive chain housing oil
level

1. Place the snowmobile on a level surface
and apply the parking brake.

2. Remove the shroud and the right side
cover. (See page 54 for removal proce­dures.)

3. Remove the dipstick, wipe it off with a
clean rag, and then insert it back into the
filler hole.

1. Dipstick

4. Remove the dipstick and check that the
oil is between the maximum and mini­mum level marks on the “REVERSE”
side of the dipstick. If the oil is below the
minimum level mark, add sufficient oil of
the recommended type to raise it to the
maximum level mark. NOTICE: Make

sure that no foreign material enters
the drive chain housing.

[ECS00531]

1. Left lower cover

77

Periodic maintenance and adjustment

WARNING

1

2

1

2

To adjust the chain tension

1. Remove the shroud and the right side
cover. (See page 54 for removal proce­dures.)

2. Loosen the locknut.

3. Turn the chain tension adjusting bolt
clockwise until it is finger tight, and then
loosen it 1/4 turn.

1. Maximum level mark

2. Minimum level mark

1. Locknut

2. Chain tension adjusting bolt

4. While holding the chain tension adjusting
bolt with a wrench, tighten the locknut to

Recommended drive chain oil:

SAE 75W or 80W API GL-3 Gear oil

5. Install the dipstick, making sure to align
the notch in the dipstick handle with the
projection on the drive chain housing.

the specified torque.

Tightening torque:

Locknut:

25 Nm (2.5 m·kgf, 18 ft·lbf)

5. Install the right side cover and the shroud.

ESU14581

Brake and parking brake

EWS00440

1. Notch

2. Projection

6. Install the right side cover and the shroud.

78

● A soft, spongy feeling in the brake lever

indicates a failure in the brake system.

● Do not operate the snowmobile if you

find any problems in the brake system.
You could lose braking ability, which
could lead to an accident. Ask a Yamaha
dealer to inspect and repair the brake
system.

Periodic maintenance and adjustment

NOTICE

ECS00060

Make sure that the brake lever end does
not project out over the handlebar end.
This will help prevent brake lever damage
when the snowmobile is placed on its side
for service.

Test the brake at a low speed when starting
out to make sure that it is working properly. If
the brake does not provide proper braking
performance, inspect the brake for wear or
brake fluid leakage. (See the following section
for more details.)

Checking the brake pads

Check the brake pads for wear according to
the following procedure.

1. Place the snowmobile on a level surface
and apply the parking brake.

2. Remove the shroud and the right side
cover (See page 54 for removal proce­dures).

3. Check the brake pads for wear.
If the brake pads reach the wear limit, ask
a Yamaha dealer to replace them.

Checking the parking brake pads

Check the parking brake pads for wear ac­cording to the following procedure.

1. Remove the shroud and the right side
cover (See page 54 for removal proce­dures).

2. Check the parking brake pads for wear by
measuring the thickness of the pads. If
the parking brake pads reach the wear
limit, ask a Yamaha dealer to replace
them.

1. Parking brake pad wear limit

Parking brake pad wear limit:

1.2 mm (0.047 in)

3. Install the right side cover and the shroud.

1. Brake pad wear limit

Brake pad wear limit:

7.5 mm (0.30 in)

4. Install the right side cover and the shroud.

To adjust the parking brake
As the parking brake pads wear, adjustment
may be necessary to ensure proper brake
performance.

1. Remove the shroud and the right side
cover (See page 54 for removal proce­dures).

2. Loosen the parking brake pad adjusting
bolt locknut and the parking brake pad
adjusting bolt.

3. Loosen the parking brake cable locknut.

4. Turn the parking brake cable adjusting
bolt in or out to adjust the cable length.

79

Periodic maintenance and adjustment

WARNING

5

4

3

2

1

4

3

8. Install the right side cover and the shroud.

Checking the brake fluid level

Before riding, check that the brake fluid is
above the lower level. Check the brake fluid
level with the top of the reservoir level. Re­plenish the brake fluid if necessary.

1. Parking brake pad adjusting bolt locknut

2. Parking brake pad adjusting bolt

3. Parking brake cable locknut

4. Parking brake cable adjusting bolt

5. Parking brake cable length

Parking brake cable length:

43.0–46.5 mm (1.693–1.831 in)

1. Lower level

5. Tighten the parking brake cable locknut.

6. Turn the parking brake pad adjusting bolt
in or out to adjust the clearance between
the parking brake pads and the brake
disc.

1. Parking brake pad

2. Brake disc

3. Parking brake pad adjusting bolt

4. Parking brake pad adjusting bolt locknut

Parking brake pad to brake disc clear­ance (a) + (b):

1.5–2.0 mm (0.059–0.079 in)

7. Tighten the parking brake pad adjusting
bolt locknut.

Specified brake fluid:

DOT 4

EWS00820

Improper maintenance can result in loss
of braking ability. Observe these precau­tions:

● Insufficient brake fluid may allow air to

enter the brake system, reducing brak­ing performance.

● Clean the filler cap before removing. Use

only DOT 4 brake fluid from a sealed
container.

● Use only the specified brake fluid; other-

wise, the rubber seals may deteriorate,
causing leakage.

● Refill with the same type of brake fluid.

Adding a brake fluid other than DOT 4
may result in a harmful chemical reac­tion.

80

Periodic maintenance and adjustment

NOTICE

WARNING

NOTICE

1

2

3

● Be careful that water does not enter the

brake fluid reservoir when refilling. Wa­ter will significantly lower the boiling
point of the fluid and may result in vapor
lock.

ECS01050

Brake fluid may damage painted surfaces
or plastic parts. Always clean up spilled
fluid immediately.

As the brake pads wear, it is normal for the
brake fluid level to gradually go down. A low
brake fluid level may indicate worn brake
pads and/or brake system leakage; therefore,
be sure to check the brake pads for wear and
the brake system for leakage. If the brake fluid
level goes down suddenly, have a Yamaha
dealer check the cause before further riding.

1. Drive sprocket tooth

2. Measuring line

3. Drive sprocket tooth width

ESU14510

Skis and ski runners

Checking the skis and ski runners

Check the skis and ski runners for wear and
damage. Replace if necessary.

ECS00560

Changing the brake fluid

EWS00471

Make sure that the brake fluid and the fol­lowing parts are replaced by a Yamaha
dealer.

Brake fluid replacement is necessary when
the following components are replaced during
the periodic maintenance or if they are dam­aged or leaking.

● All oil seals of the master cylinder and cali-

per cylinder

● The brake hose

ESU14270

Extrovert drive sprocket

Check the extrovert drive sprocket for wear
and damage. Replace if necessary.

To measure the drive sprocket wear

Measure the drive sprocket tooth width at the
measuring line shown. If the tooth width is 13
mm (0.51 in) or less, replace the drive sprock­et.

Avoid scratching the skis when loading
and unloading the snowmobile, when
riding in areas with little or no snow, or on
sharp edges such as concrete, curbs, etc.
This will wear or damage the skis.

RST90PTF

1

1. Ski runner wear limit

81

Periodic maintenance and adjustment

1

2

1

1

3

2 2

1. Ski wear limit

2. Ski runner

Ski runner wear limit:

8.0 mm (0.31 in)

Ski wear limit:

24.0 mm (0.94 in)

1. Ski wear limit (front)

2. Ski runner

3. Ski wear limit (rear)

RS90PLT / RST90PGT

1. Ski runner wear limit

82

Ski runner wear limit:

6.0 mm (0.24 in)

Ski wear limit (front):

13.0 mm (0.51 in)

Ski wear limit (rear):

8.0 mm (0.31 in)

Aligning the skis

1. Turn the handlebar so the skis face
straight ahead.

2. Check the following for ski alignment:

● Skis are facing forward.

● Ski toe-out (distance A – distance B) is

within specification.

1. Distance A

2. Distance B

Periodic maintenance and adjustment

TIP

WARNING

WARNING

Ski toe-out (distance A – distance B):

0.0–15.0 mm (0.00–0.59 in)

Move the front tip of each ski fully inward be­fore measuring or aligning.

3. If the alignment is not correct, consult a
Yamaha dealer.

ESU12152

Steering system

Check the handlebar for excessive free play.

To check the handlebar

1. Push the handlebar up and down and
back and forth.

2. Turn the handlebar slightly to the right
and left.

If excessive free play is felt, consult a Yamaha
dealer.

ESU13702

Drive track and slide runners

Drive track

EWS00481

● When the rear of the snowmobile is

raised to allow the drive track to spin, a
suitable stand must be used to support
the rear of the snowmobile. Never allow
anyone to hold the rear of the snowmo­bile off the ground to allow the drive
track to spin. Never allow anyone near a
rotating drive track.

● Inspect the drive track condition fre-

quently. Replace any damaged slide
metal. Replace the drive track if it is
damaged to the depth where fabric rein­forcement material is visible or support
rods are broken. Otherwise, track dam­age or failure could result in loss of
braking ability and snowmobile control,
which could cause an accident.

Checking the drive track

EWS00490

Do not operate the snowmobile if you find
damage to the drive track, or if it has been
maladjusted. Drive track damage or failure
could result in loss of braking ability and
snowmobile control, which could cause
an accident.

Check the drive track alignment and deflec­tion, and check the track for wear and dam­age.
Adjust or replace if necessary. (See the fol­lowing section for more details.)

A broken track, track fittings or debris
thrown by the drive track could be danger­ous to an operator or bystanders. Observe
the following precautions:

● Do not allow anyone to stand behind the

snowmobile when the engine is running.

83

Periodic maintenance and adjustment

TIP

1

2

1

Checking the drive track alignment

1. Lift the rear of the snowmobile onto a suit­able stand to raise the drive track off the
ground.

2. Start the engine and rotate the drive track
one or two turns. Stop the engine.

3. Check the drive track alignment with the
slide runners. If the alignment is incorrect,
adjust the drive track.

1. Drive track deflection

2. Slide runner

Standard drive track deflection:

30.0–35.0 mm (1.18–1.38 in)

3. If the deflection is incorrect, adjust the
drive track.

Adjusting the drive track alignment and de-

1. Slide runner

Measuring the drive track deflection

1. Lay the snowmobile on its side.

2. Measure the drive track deflection with a
spring scale. Pull at the center of the drive
track with a force of 100 N (10 kgf, 22 lbf).

flection (RS90PLT)

1. Loosen the rear axle nut.

1. Spring scale

Measure the gap between the slide runner
and the edge of the track window on both
sides.

84

1. Rear axle nut

2. Lift the rear of the snowmobile onto a suit­able stand to raise the drive track off the
ground.

3. Start the engine and rotate the drive track
one or two turns. Stop the engine.

4. Loosen the locknut on the left and the
right sides of the snowmobile, then align
the drive track by turning the adjusting
bolt on each side.

Periodic maintenance and adjustment

31 23

Drive track

alignment

Left adjusting
bolt

Right adjust­ing bolt

1. Left adjusting bolt

2. Right adjusting bolt

3. Locknut

Shifted to right

Shifted to

right

Tur n ou t Tu r n i n

Turn in Turn out

Shifted to left

Shifted to left

1. Forward

2. Gap

3. Slide runner

4. Drive track

5. Slide metal

5. Adjust the drive track deflection to speci­fication. NOTICE: The right and left ad-

justing bolts should be turned an
equal amount.

Drive track

deflection

Left adjusting
bolt

Right adjust­ing bolt

[ECS00970]

More than

specified

Tur n in Tur n ou t

Tur n in Tur n ou t

Less than

specified

1. Forward

2. Gap

3. Slide runner

4. Drive track

5. Slide metal

6. Tighten the locknuts to their specified
torque.

Locknut tightening torque:

59 Nm (5.9 m·kgf, 43 ft·lbf)

7. Recheck alignment and deflection. If nec­essary, repeat steps 3 to 6 until the prop­er adjustment is achieved.

8. Lower the snowmobile to the ground.

9. Tighten the rear axle nut.

Rear axle nut tightening torque:

75 Nm (7.5 m·kgf, 54 ft·lbf)

Adjusting the drive track alignment and de­flection (RST90PGT / RST90PTF)

1. Loosen the rear axle nut.

85

Periodic maintenance and adjustment

Shifted to right

1. Rear axle nut

2. Lift the rear of the snowmobile onto a suit­able stand to raise the drive track off the
ground.

3. Start the engine and rotate the drive track
one or two turns. Stop the engine.

4. Align the drive track by turning the left
and right adjusting nuts.

Drive track

alignment

Left adjusting
nut

Right adjust­ing nut

1. Left adjusting nut

2. Right adjusting nut

Shifted to

right

Tur n ou t Tu r n i n

Turn in Turn out

Shifted to left

1. Forward

2. Gap

3. Slide runner

4. Drive track

5. Slide metal

Shifted to left

1. Forward

2. Gap

3. Slide runner

4. Drive track

5. Slide metal

5. Adjust the drive track deflection to speci­fication. NOTICE: The right and left ad-

justing nuts should be turned an equal
amount.

Drive track

deflection

Left adjusting
nut

Right adjust­ing nut

[ECS00592]

More than

specified

Tur n in Tur n ou t

Tur n in Tur n ou t

Less than

specified

86

Periodic maintenance and adjustment

NOTICE

WARNING

TIP

12

1

6. Recheck alignment and deflection. If nec­essary, repeat steps 3 to 5 until the prop­er adjustment is achieved.

7. Lower the snowmobile to the ground.

8. Tighten the rear axle nut.

Rear axle nut tightening torque:

75 Nm (7.5 m·kgf, 54 ft·lbf)

Slide runners

Check the slide runners for wear and dam­age.
If the slide runners reach the wear limit, they
should be replaced.

1. Slide runner

2. Wear limit height

Slide runner wear limit height:

10.5 mm (0.41 in)

EWS00511

Do not grease the throttle cable because it
could become frozen, which could cause
loss of control. Apply a dab of grease onto
the cable end only.

For parts equipped with a grease nipple, use
a grease gun.

Lubricants:

Brake lever:

Silicone grease

Other lubrication points:

Low-temperature grease

1. Lubrication point

ECS00350

Ride on fresh snow frequently. Operating
on ice or hard-packed snow will rapidly
wear the slide runners.

ESU12198

Lubrication

Lubricate the following points with the speci­fied grease.

1. Throttle cable end

87

Periodic maintenance and adjustment

1

1

1

1

RST90PGT

1. Grease nipple

1. Grease nipple

RS90PLT

1. Grease nipple

1. Grease nipple

RST90PTF

1. Grease nipple

ESU14590

Replacing a headlight bulb

RS90PLT

1. Remove the top cover. (See page 54 for
removal procedures.)

2. Remove the screws, and then remove
the headlight access panel.

88

1

1. Screw

Periodic maintenance and adjustment

1

2

1

1

2

1. Screw

2. Headlight access panel

3. Disconnect the headlight coupler.

4. Remove the bulb holder cover.

1. Headlight coupler

2. Bulb holder cover

5. Unhook the bulb holder, and then remove
the burnt-out bulb.

the glass part of the bulb or its life and
illumination will be affected. If the
glass is oil stained, thoroughly clean it
with a cloth moistened with alcohol or
lacquer thinner.

1. Do not touch the glass part of the bulb.

Bulb type:

Halogen bulb

7. Install the bulb holder cover, and then
connect the headlight coupler.

8. Install the headlight access panel, and
then install the screws.

9. Install the top cover.

[ECS00621]

RST90PGT / RST90PTF

1. Remove the shroud and the top cover.
(See page 54 for removal procedures.)

2. Remove the headlight unit bolt and the
windshield stay bolts on each side of the
snowmobile.

1. Bulb holder

6. Install a new bulb, and then hook the bulb
holder onto the headlight unit. NOTICE:

Keep oil and your hands away from

1. Headlight unit bolt

2. Windshield stay bolt

89

Periodic maintenance and adjustment

1

1

2

1

1

3. Unhook the headlight unit as shown, then
lift it up and move it forward, away from
the handlebar. NOTICE: Be careful not

to scratch the snowmobile when mov­ing the headlight unit.

1. Headlight unit

4. Disconnect the headlight coupler.

5. Remove the bulb holder cover.

[ECS00920]

1. Bulb holder

7. Install a new bulb, and then hook the bulb
holder onto the headlight unit. NOTICE:

Keep oil and your hands away from
the glass part of the bulb or its life and
illumination will be affected. If the
glass is oil stained, thoroughly clean it
with a cloth moistened with alcohol or
lacquer thinner.

[ECS00621]

1. Headlight coupler

2. Bulb holder cover

6. Unhook the bulb holder, and then remove
the burnt-out bulb.

90

1. Do not touch the glass part of the bulb.

Bulb type:

Halogen bulb

8. Install the bulb holder cover, and then
connect the headlight coupler.

9. Install the headlight unit, making sure to
fit the slots on its bottom onto the projec­tions on its stay.

Periodic maintenance and adjustment

WARNING

1

2

1

1

(b)

(a)

1. Slot

2. Projection

10. Fit the weatherstrip on the headlight unit
into the recess in the top of the air filter
case cover.

1. Weatherstrip

11. Install the headlight unit bolts and wind­shield stay bolts, and then tighten them to
their specified torques.

Tightening torques:

Headlight unit bolt:

3.0 Nm (0.30 m·kgf, 2.2 ft·lbf)

Windshield stay bolt:

14 Nm (1.4 m·kgf, 10 ft·lbf)

headlight beams, turn the headlight
beam adjusting screw in direction (a). To
raise the headlight beams, turn the head­light beam adjusting screw in direction
(b).

1. Headlight beam adjusting screw

3. Install the top cover.

ESU12290

Fittings and fasteners

Check the tightness of the fittings and fasten­ers.
Tighten in proper sequence and torque if nec­essary.

ESU14020

Battery

The battery is located under the air filter case.
(See page 92.)
This model is equipped with a VRLA (Valve
Regulated Lead Acid) battery. There is no
need to check the electrolyte or to add distilled
water. However, the battery lead connections
need to be checked and, if necessary, tight­ened.

EWS00540

12. Install the top cover and the shroud.

ESU12270

Adjusting the headlight beams

1. Remove the top cover. (See page 54 for
removal procedures.)

2. Use a Phillips screwdriver to turn the
headlight beam adjusting screw and ad­just the headlight beams. To lower the

Battery electrolyte is poisonous and dan­gerous. It contains sulfuric acid and can
cause severe burns. Avoid contact with
skin, eyes, or clothing.
ANTIDOTE:

● EXTERNAL: Flush with water.

91

Periodic maintenance and adjustment

WARNING

NOTICE

WARNING

NOTICE

1

● INTERNAL: Drink large quantities of wa-

ter or milk. Follow with milk of magne­sia, beaten egg, or vegetable oil. Call
physician immediately.

● EYES: Flush with water for 15 minutes

and get prompt medical attention.
Batteries produce explosive gases. Keep
sparks, flame, cigarettes, etc. away. Venti­late when charging or using in an en­closed space. Always shield your eyes
when working near batteries.
KEEP OUT OF THE REACH OF CHILDREN.

Charge or have a Yamaha dealer charge the
battery as soon as possible if it seems to have
discharged. Keep in mind that the battery
tends to discharge more quickly if the snow­mobile is equipped with electrical accesso­ries.

EWS00610

● Never smoke around the battery while it

is being charged. Sparks may ignite the

hydrogen gas created by the battery.

● Disconnect the negative lead first, then

the positive lead from the battery.

● Connect the positive lead first, then the

negative lead to the battery when install-

ing the battery.

● Never connect the battery to or discon-

nect it from the snowmobile while it is

being charged. Sparks may ignite the

hydrogen gas created by the battery.

● Make sure that the battery terminals are

tight.

ECS00843

● Do not charge the battery quickly.

ESU14600

Replacing a fuse

EWS00550

Be sure to use the specified fuse. A wrong
fuse could cause electrical system dam­age or A FIRE HAZARD.

ECS00631

Be sure to turn the main switch to the off
position and disconnect the negative bat­tery lead to prevent accidental short-cir­cuiting.

The main fuse and the fuel injection system
fuse are located under the air filter case. The
fuse box, which contains the fuses for the in­dividual circuits, is located behind the right
side cover.

1. Remove the shroud, the left and right
side covers, and the top cover. (See page
54 for removal procedures.)

2. Remove the headlight unit bolt and the
windshield stay bolts (RST90PGT /
RST90PTF) on each side of the snowmo­bile.

RS90PLT

● To charge a VRLA (Valve Regulated

Lead Acid) battery, a special (constant­voltage) battery charger is required. Us­ing a conventional battery charger will
damage the battery.

92

1. Headlight unit bolt