Ski-Doo 750 Plus 1979, 1979 Blizzard 7500 Plus Operator's Manual

Trademark of Bombardier Limited

model

V.I.N.

purchase date

warranty expiry date

DEALER IMPRINTAREA

MOTO-SKI
FUTURA
SPIRIT
NUVIK
SONIC

Text by:

Technical Information Centre
After Sales Service Department
Bombardier Limited
Valcourt, Quebec

Canada, JOE2LO
Suggested Retail Price: $2.75

(First copy free with unit purchased)

The following are trademarks of Bom­bardier Limited.

BOMBARDIER EVEREST
SKI-DOO MIRAGE
ALPINE NORDIC

BLIZZARD OLYMPIQUE

CARRY-BOOSE SKI-BOOSE

ELAN

T'NT

ELITE

BOMBARDIER

LTEE/LTD

Groupe

des

produits

recreatifs

Recreational

Products

Group

Mar

chI,

1 9 79

Valcourt, Oue., Canada,

JOE

2LO

Telephone

1514)

532-2211

Cable Bombarsnow, Telex

05/832550

Valcourt, Que.. Canada, JOE

2L.O

Telephone (514)

532-2211

Cable Bombarsnow, Telex05

/832550

ERRATUM

Dear

Customer,

As

an

owner

of

a

1979

Blizzard

7500

or

1979

Super

Sonic

LC,

we

wish

to

advise

you

of

a

couple

of

errors

that

were

made

in

the

spec-

ifications

given

on

page

26

of

the

Operator

manual.

Would

you

please

correct

the

following

items:

carburetor

adjustments

air

screw

1

1/2

turns!

1/8

engine

head

nuts

(torque)

22

N.m

(16

ft-lbs)

We

thank

you

for

your

understanding

and

coop-

eration

and

wish

you

pleasant

spring

snowmo-

biling.

TECHNICAL INFORMATION CENTER

GROUPE

BOMBARDIER

MLW

BOM

Mi W

l;HOUP

This manual
formation

r1nt"'~"'Tl

..

r<

symbols:

....

WARNING:

Identifies an instruc-

...

tion

which,ifnot

followed, could

cause injury.

...

CAUTION: Denotes an instruc-

" tlon

which,ifnot

followed, could

severely

damage

vehicle components.

O

NOTE: Indicates
information

needed to

plete an instruction.
Although the mere reading of such

in-

formation does

not

eliminate the haz-

your understanding of the infer-

YY\~'TIr\,n

will promote its correct use.

Ride safe and have fun.
Recreational Products Group

Bombardier Limited,

Valcourt, Canada

mind.

The information has been to

the owner

I

of

a

new

snowmobile

with

various

ve·-

hide

owner-related mainte­nance/ and instructions.
This

is

"Ihe

Snow­mobile Safety Booklet' and
the Manual'. Each is insepa-

use of the product,

with the vehicle at

CONGRATULATIONS

...

You

are

now

the owner of a nevv 1979snow-

vehicle

is the result of in-

comoarabte teamwork between Bom-

rt.r..,..

...

nr>i'"\'-C'

and tech-

this vehicle

is

enomeereo

with

Observe

the

following

precautions:

@l

Throttle

mechanism

should

be
checked for free movement before
starting engine.

@l Engineshould be running only when

pulley guard is secured in place.

@l Never run engine

without

drive belt

installed. Running an unloaded

en-

gine can prove to be dangerous.

@l Never run the engine when the track

of the vehicle is raised

off

the

ground.

@l It can be dangerous to run engine

with the cab open.

@) Since engine cooling is fully ineffect

only when the vehicle is in motion
and driven on snow, it is

not

recom-

mended that you allow the engine
to idle for more than brief periods
and

lor

you drive the vehicle on icy

surface. Prolonged idling and

lor

continuous driving on ice may cause
engine damage.

@! Gasoline is flammable and explosive

under certain conditions. Always
perform procedures in a well ventila-

ted area. Do not smoke or allow

open flames or sparks in the vicinity.
If gasoline fumes are noticed while
driving, the cause should be

deter-

mined and corrected

without

delay.

@) Your snowmobile is not designed to

be operated on public streets, road
or highways. In most States and

Provinces, it is considered an ille-

galoperation.

@) Maintain your vehicle in top mocha-

nical condition at all times.

@! Your snowmobile is not designed to

be driven or operated on black top,
bare earth, or other abrasive surfa­ces. On such surfaces abnormal and
excessive wear of critical parts is
inevitable.

2

@) Only perform procedures as detailed

in this manual. Unless otherwise
specified, engine should be turned
OFF for all lubrication and mainte­nance procedures.

@! Installation

of

other than

"stock"
equipment, including ski-spreaders,
bumpers, pack

racks, etc., could
severely affect the stability and
safety of your vehicle. Avoid ad­ding

on"

accessories that alter the

basic vehicle configuration.

@! When removing coolant tank cap,

first place a cloth over cap

then turn

cap to its f rst step to release

pressure.

@!

The snowmobile engine can be
stopped by activating the

emergen-

cy

cut-out

or tether switches, or

turning

off

the key,

@) This vehicle is designed tor the

driver only. No provisions have

been

made for a passenger.

Please

read and understand all other

warnings contained elsewhere.

CONTROLSI INSTRUMENTS

Throttle control lever, brake control lever, ignition switch, headlamp dimmer
switch, emergency cut-out switch, tether cut-out switch, rewind starter handle,
primer, tachometer, temperature gauge, cab opening, tool compartment, fuel

gauge

4

BREAK

lIN

PERIOD

Inspection, inspection check list.

. 1

fUEL

MIXING

Recommended gasoline, recommended oil, fuel mixture ratio, fuel mixing proce-

dure

1

PRE-STARTCHECK

Check points .

......................

.9

STARTING PROCEDURE

Ernerqencv starting . . . .

..

.· 1«)

lUBRICATION

Frequency, pullev guard removal, drive belt removal, steering mechanism, chain-

case oilleve!, slide suspension, rotary valve system _ 11

MAINTENANCE

Spark plugs, suspension condition, track condition, suspension adjustment, track
tension and alignment, carburetor adjustment, drive belt, steering mechanism,
steering adjustment, cooling system, brake, engine head nuts, engine

mount

nuts,

exhaust

system, vehicle general inspection, headlamp beam aiming, bulb re-

placement . o. .

....•.

0

•••••••••••••••••

,

•••

,

•••••••••••••••••••

13

STORAGE

Cooling system. track, slide suspension, ski assembly, controls, chaincase, fuel

carburetors, cylinder lubrication, drive pulley, chassis, general inspection

.18

PRE-8EASON PREPARATION

Pre-season preparation

chart.

. . . . . . . . . . . . . . . .

..

. , 22

TROUBUE SHOOTING GUUlE

_. .

..

. , , _ 23

TOOLS,

.. , , . . . . 25

SPECIfICATIONS,

.. , . 26

HOW

TO

IDENTIfY

YOUR SNOWMOBILE. . , ..21

1~19

"UMBTED

WARRANTY"...

.. .. .. .. .. . , . ' , . , . 28

OfTEN

ASKED

QUESTIONS.

_ _ 30

CONSUMER

GUIDE.

. . . . . . . . . . . . . . . . . . . . . . . 32

USTING

Of

AREA

DISTRIBUTORS . . . . . . . . . . . , _

..

33

CHANGE

Of

ADDRESS

AND

OWNERSHIP , 35

3

F) Tether Cut-Out

Switch

G) Rewind Starter Handle

H) Primer
I)

Tachometer

J) Coolant Temperature Gauge

r-----------.-.-.~.-----,-

.......

A) Throttle Control Lever
B)

Brake Controt Lever

C) Ignition Switch

D)

Headlamp Dimmer

Switch

E) Emergency Cut-Out

Switch

,-

,

--.1

Located on right side of handlebar.

When compressed, it controls the

en-

gine speed

and the engagementofthe
transmission. When released, enqmo
speed returns automatically to idle.

Located on the left side of handlebar.

When compressed, the brake is ap··

olied. When released, it automatically

returns to its

original position. Braking

effect is proportionate to the pressure
applied on the lever.

4

OFF

,."..

ON

Key operated,

2 position switch (OFF /

ON). To start engine, first turn key
clockwise to ON position. To stop

en"
gine, turn key counter-clockwise
OFF position.

O

NOTE: When

the

key is turned to

the ON position the

lights will

also be on as soon as the engine will be

turning.

The dimmer switch, located on left side
of handlebar, allows correct selection
of headlamp beam. To obtain high or

low

beam simply depress switch.

A push button switch located on right
side of handlebar. To stop the engine
in an emergency, press button

down

into

lower

position. Before re-starting

engine always depress button into re

..
leased upper position. The driver of
this vehicle should familiarize himself

with

the function of this device by

using it several times on first outing.
Thereby being mentally prepared for
emergency situations requiring its use.

WARNiNG:

If

the

button

has

been used in an emergency situa-

tion

the source

of

malfunction should

be determined and corrected before

restarting engine.

Attach tether

cora to wrist or other

convenient location then snap tether

cut-out

cap over receptacle before

starting engine.

If emergency engine

"shut-off"

is re-

quired completely pull

Gap

from safety

switch and engine power will.

be auto-

matically shut

"off".

O

NOTE: The cap must be installed
on the safety switch at all times

in order to operate the vehicle.

WARNING: If

the

switch

is used

in an emergency situation

the

source

of

malfunction should be de-

termined

and corrected before re-

starting engine.

Auto

rewind type located on right hand
side of vehicle. To start engine, pull
handle.

A push-pull button located alongside
manual starter handle. Pull and push
button (2-3

times) to activate primer.
The primer should always be used for
cold engine starts. After engine is
warm however, it is

not

necessary to

use primer when starting.

The tachometer registers the impulses
of magneto. Direct-reading dial indi­cates, in thousands,

the

number of re-

volutions per minute

(F-lPM)

of the

engine.

_ CAUTION: The tachometer

is

."..

protected by a fuse. If tachome­ter stops operating, check fuse condi­tion

and if necessary, replace. The fuse

is

0.1 amps. Do

not

use a higher rated

fuse as this

can cause severe dam-

age to

the

tachometer.

The gauge indicates engine coolant
temperature. Normal operating

tem-

perature is between 50° to 80° C

(120°

to 180

0

F), (coolanttemperature

can vary depending on driving and

snow

conditions). However, should

the
pointer of the temperature gauge touch
the red zone, reduce speed and run
vehicle in loose

snow

or stop engine

immediately.

WARNING:

Before removing

the

cap always release

the

pressure
by placing a cloth over the cap and by
partially unscrewing it (first step). If
this

is disregarded loss of fluid and

possibility

of

severe burns could occur.

To open cab, unfasten latches on

both

sides near footrest where cab meets

frame. Always lift cab gently up until
stopped by restraining device.

WARNING:

It is dangeroustorun

engine

with

cab open. Personal

injury could result.

5

Located under the cab. To gain access,

tilt cab. Ideal location for spare plugs,

belt, rope,

etc.

To

check fuel level, simply unscrew

fuel tank cap and

withdraw

dipstick.

WARNING:

Never use a lite

match or open flame to check

fuel level,

6

With

Bornbardier-Hotax engines, a

break-in period

of

6 to 10 operating

hours is required before running the
vehicle

at full throttle. During this pe-

riod, brief full throttle accelerations
and constant speed variation will

con­tribute to a good break-in. Continued
wide open throttle accelerations can be
detrimental. Never let your engine
overheat.

CAUTION:

Incorrect or lack a

break-in

period

will result in engine

horsepower loss.

As

with

any precision piece of mechen-

ieal equipment, we suggest

that

after

the first 10 hours of operation or 30

days after the

purchase, whichever
comes first, that your vehicle be
checked by your

dealer. This inel'st>

tion will give you the opportunity to

discuss the unanswered questions

you

may have encountered during the first
hours

of

operation. Remember that it

is easier to remedy at this time than to
allow the snowmobile to operate until

a possible breakage occurs.

The 10

hours

inspection is at

the

ex··

of

the

vehicle owner.

Engine

mount

nuts

Muffler

attachment

Chain

case oil level

Engine coolant level

,---------_.

Rotary valve reservoir oil level

---,

Brake operation and lining condition

._------------

Skis alignment (runners condition)
Pulley alignment and drive belt condition

-,,~-----,-,---------------------_+-_l

Track condition. tension and alignment

._-----,------,---_._-------------------+--

lubricate

(steering suspension)

"-----

Electrical wiring (loose connections, stripped wires, damaged insulation), tighten all loose

bolts,

nuts

and linkage

eration of lighting system {HI / LO beam, brake light,

etc.). test operation of emergency

t-out

switch

We

recommend

that

you

have

your

dealer

sign

this

inspttetion.

Dateof10 hour inspection Dealer

7

Oil must be added to the gasoline in
pre-measured amounts then both oil
and gasoline should be thoroughly
mixed together before fueling the tank,

The correct gasoline is regular gasoline

(not less than

92 octane), available

from all service stations.

CAUTION:

Never

experiment

with

different fuel Or fuel ratios.

Never use

low

lead or non leaded gaso-

line, naphtha, methanol or similar

products.

Use concentrated Bombardier

snow­mobile oil available from your dealer.
This type of

oil has specially formulated

oil bases to meet the lubrication

re­quirements of the Bombardier-Hotax
engine.

If Bombardier snowmobile oil is un-

available substitute

with

a high-quality

2 cycle snowmobile

oil.~he

oil /

~as

mix must meet the vehicle require­ments, See oil manufacturer

recom-

mendations on container.

CAUTION:

Never use outboard

or

straight mineral oils.

The

importance of using the correct

fuel.rnixture cannot be overstressed. An

incorrect fuel ratio

results in serious en-

~Jine

damage. Recommended fuel ratio

is 50

/1.

S.l. Measure

500 mL oil to 25 liters

= 50/1

Imperial Measure

1 can 16 oz oil to 5 Imp. gals 50/1

U.S. Measure

1 can 12 oz oil to 5 U.S, gals = 50/1

O

N. OTE: To facilitate fuel mixing oil

should be kept at

room temper-

ature.

8

To mix the gasoline and oil always USe
a separate clean container. Never mix
directly in your snowmobile tank. For

best results, acquire

two

containers, ei-

ther plastic or metal. Draw from one
until empty then use the second one.

WARNING:

Gasoline is flarnma-

ble and explosive

conditions.

Always perform

Pf()CEldurea

in a well ventilated area.

00

not
or allow open flames or sparks in
vicinity.

If gasoline fumes are

noitice'(1

while driving, the cause should

termmed and corrected

without

Never add fuel while engine is rurmllnq,
Avoid skin contact

with

fuel at

freezing temperatures.

1. Pour approximately one gallon of
qasoline into a

clean container,

2. Add the full amount of oil.