How it Works
YAMAHA
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YFM45FXZ
User Manual
156 pgs15.12 Mb0
Table of contents
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YAMAHA YFM45FXZ User Manual

READ THIS MANUAL CAREFULLY!
It contains important safety information.
OWNER’S MANUAL
YFM45FXZ
WARNING
This ATV should not be ridden by anyone under 16 years of age.
3C2-F8199-14LIT-11626-23-24
Read this manual carefully before operating this vehicle. This manual should stay with this ve-
hicle if it is sold.

INTRODUCTION

Congratulations on your purchase of the Yamaha YFM45FXZ. This ATV represents the result of many years of Yamaha experience in the production of fine sporting, touring, and pacesetting racing machines. With the purchase of this Yamaha, you can now appreciate the high degree of craftsmanship and reliability that have made Yamaha a leader in these fields. This manual will provide you with a good basic understanding of the features and operation of this ATV.
This manual includes important safety information. It provides information about special tech­niques and skills necessary to ride the ATV. It also includes basic maintenance and inspection proce-
dures. If you have any questions regarding the operation or maintenance of your ATV, please consult a Yamaha dealer.
AN IMPORTANT SAFETY MESSAGE:
● Read this manual together with TIPS FOR THE ATV RIDER carefully and completely before operating
your ATV. Make sure you understand all instructions.
● Pay close attention to the warning and notice labels on the ATV.
● Never operate an ATV without proper training or instruction. Free training is available to anyone who buys
a new ATV. Call 1-800-887-2887 for more information.
● This ATV should not be ridden by anyone under 16 years of age.
● This ATV is a high-performance ATV for off-road use only, for sport-type recreational and competitive use
by experienced operators.

IMPORTANT MANUAL INFORMATION

FAILURE TO FOLLOW THE WARNINGS CONTAINED IN THIS MANUAL CAN RESULT IN SERIOUS IN­JURY OR DEATH. 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.
WARNING
NOTICE
TIP
A WARNING indicates a hazardous situation which, if not avoided, could result in death or serious injury.
A NOTICE indicates special precautions that must be taken to avoid damage to the vehicle or other property.
A TIP provides key information to make procedures easier or clearer.
* Product and specifications are subject to change without notice.

IMPORTANT NOTICE

This ATV is designed and manufactured for off-road use only. It is illegal and unsafe to operate this ATV on any public street, road or highway. This ATV complies with all applicable off-road noise level and spark arrester laws and regulations in effect at the time of manufacture. Please check your local riding laws and regulations before operating this ATV.
EBU17402
YFM45FXZ
OWNER’S MANUAL
©2009 by Yamaha Motor Corporation, U.S.A.
1st edition, June 2009
All rights reserved.
Any reprinting or unauthorized use
without the written permission of
Yamaha Motor Corporation, U.S.A.
is expressly prohibited.
Printed in U.S.A.
P/N LIT-11626-23-24
EWB00011
WARNING
Indicates a hazardous situation which, if not avoided, could result in death or serious injury.

TABLE OF CONTENTS

LOCATION OF THE WARNING AND
SPECIFICATION LABELS ............................ 1-1
SAFETY INFORMATION .............................. 2-1
Speed limiter ...............................................4-7
Front brake lever .........................................4-7
Brake pedal and rear brake lever ...............4-8
Drive select lever ........................................4-9
Fuel tank cap ..............................................4-9
Fuel .............................................................4-9
Fuel cock ..................................................4-11
Starter (choke) ..........................................4-12
Seat ..........................................................4-13
Storage compartment ...............................4-14
Adjusting the front shock absorber
assemblies ..............................................4-15
Adjusting the rear shock absorber
assembly .................................................4-16
DESCRIPTION .............................................. 3-1
Left view ...................................................... 3-1
Right view.................................................... 3-1
Controls and instruments ............................ 3-2
INSTRUMENT AND CONTROL
FUNCTIONS .................................................. 4-1
Main switch ................................................ 4-1
Indicator lights and warning light ................ 4-2
Speedometer unit ....................................... 4-3
Handlebar switches .................................... 4-4
Throttle lever .............................................. 4-6
PRE-OPERATION CHECKS ..........................5-1
Fuel .............................................................5-3
Engine oil ....................................................5-3
Final gear oil ...............................................5-3
Differential gear oil ......................................5-3
Coolant .......................................................5-3
Front and rear brakes .................................5-3
Throttle lever ...............................................5-4
Tires ............................................................5-4
Chassis fasteners .......................................5-6
Instruments, lights and switches .................5-6
OPERATION .................................................. 6-1
Starting a cold engine ................................ 6-1
Starting a warm engine .............................. 6-3
Operating the drive select lever and
driving in reverse ...................................... 6-3
Engine break-in .......................................... 6-4
Parking ....................................................... 6-5
Parking on a slope ..................................... 6-5
Accessories and loading ............................ 6-6
RIDING YOUR ATV ...................................... 7-1
GETTING TO KNOW YOUR ATV............... 7-2
RIDE WITH CARE AND
GOOD JUDGMENT .................................. 7-2
BE CAREFUL WHERE YOU RIDE............. 7-9
TURNING YOUR ATV .............................. 7-12
CLIMBING UPHILL ................................... 7-13
RIDING DOWNHILL.................................. 7-16
CROSSING A SLOPE............................... 7-17
CROSSING THROUGH SHALLOW
WATER ................................................... 7-18
RIDING OVER ROUGH TERRAIN ........... 7-21
SLIDING AND SKIDDING ......................... 7-21
WHAT TO DO IF... .................................... 7-22
WHAT TO DO... ........................................ 7-23
PERIODIC MAINTENANCE AND
ADJUSTMENT................................................8-1
Owner’s manual and tool kit .......................8-1
Periodic maintenance chart
for the emission control system ................8-3
General maintenance and
lubrication chart ........................................8-5
Removing and installing cowlings and
panels .....................................................8-10
Checking the spark plug ...........................8-17
Engine oil and oil filter cartridge ................8-19
Final gear oil .............................................8-23
Changing the differential gear oil ..............8-26
Coolant .....................................................8-27
Cleaning the air filter element ...................8-31
Cleaning the spark arrester ......................8-34
V-belt cooling duct check hose .................8-36
V-belt case drain plug ...............................8-36
Adjusting the carburetor ............................8-37
Adjusting the engine idling speed .............8-37
Adjusting the throttle cable free play .........8-38
Valve clearance ........................................8-39
Adjusting the drive select lever safety
system cable ...........................................8-39
Brakes .......................................................8-39
Checking the front and rear brake pads ...8-39
Checking the brake fluid level ...................8-41
Changing the brake fluid .......................... 8-42
Checking the front brake lever
free play ................................................. 8-42
Adjusting the rear brake lever free play
and checking the brake pedal position ... 8-42
Axle boots ................................................ 8-44
Brake light switches ................................. 8-44
Checking and lubricating the cables ........ 8-45
Checking and lubricating the front and
rear brake levers .................................... 8-45
Checking and lubricating
the brake pedal ...................................... 8-46
Checking the wheel hub bearings ............ 8-47
Lubricating the steering shaft ................... 8-47
Battery ...................................................... 8-48
Replacing a fuse ...................................... 8-50
Replacing a headlight bulb ....................... 8-52
Adjusting a headlight beam ...................... 8-53
Replacing the tail/brake light bulb ............ 8-54
Removing a wheel .................................... 8-55
Installing a wheel ...................................... 8-55
Troubleshooting ....................................... 8-56
Troubleshooting charts ............................. 8-57
CLEANING AND STORAGE.......................... 9-1
Cleaning ..................................................... 9-1
Storage ....................................................... 9-2
SPECIFICATIONS .......................................10-1
CONSUMER INFORMATION.......................11-1
Identification numbers ...............................11-1
Noise regulation ........................................11-4
Maintenance record ..................................11-5
YAMAHA MOTOR CORPORATION,
U.S.A. ATV LIMITED WARRANTY .........11-6
YAMAHA EXTENDED SERVICE
(Y.E.S.) ...................................................11-8

LOCATION OF THE WARNING AND SPECIFICATION LABELS

12 34 65
1
1-1
Read and understand all of the labels on your ATV. These labels contain important information for safe and
1
proper operation. Never remove any labels from your ATV. If a label becomes difficult to read or comes off, request a replace­ment label from your Yamaha dealer.
12
5.8 psi, (40 kPa)
5.8 psi, (40 kPa)
5.3 psi, (37 kPa)
5.3 psi, (37 kPa)
220 lbs, (100 kg)
3C2-F816M-00
1-2
34
UNDER
16
16
16.
1
1-3
56
1
Certification of Compliance This ATV complies with applicable provisions of ANSI/SVIA1-2007 and is subject to an approved ATV action plan submitted by YAMAHA and on file with the U.S. Consumer Product Safety Commission.
YAMAHA MOTOR CORPORATION U.S.A.
6555 Katella Avenue, Cypress, California 90630-5101, U.S.A.
37S-F817J-20
1-4

SAFETY INFORMATION

AN ATV IS NOT A TOY AND CAN BE HAZARD­OUS TO OPERATE.
An ATV handles differently from other vehicles, in­cluding motorcycles and cars. A collision or roll­over can occur quickly, even during routine maneuvers such as turning and riding on hills or over obstacles, if you fail to take proper precau­tions. SEVERE INJURY OR DEATH can result if you do not follow these instructions:
● Read this manual and all labels carefully and fol-
low the operating procedures described.
● Never operate an ATV without proper training or
instruction. Take a Training Course.
Beginners should receive training from a certified instruc­tor. Contact an authorized ATV dealer or call 1­800-887-2887 to find out about the training courses nearest you.
● Always follow the age recommendation:
– A child under 16 years old should never oper­ate an ATV with engine size greater than 90 cc.
● Never allow a child under age 16 to operate an
ATV without adult supervision, and never allow continued use of an ATV by a child if he or she does not have the abilities to operate it safely.
● Never carry a passenger on an ATV.
● Always avoid operating an ATV on any paved
surfaces, including sidewalks, driveways, park­ing lots and streets.
● Never operate an ATV on any public street, road
or highway, even a dirt or gravel one.
● Never operate an ATV without wearing an ap-
proved motorcycle helmet that fits properly. You should also wear eye protection (goggles or face shield), gloves, boots, a long-sleeved shirt or a jacket, and long pants.
● Never consume alcohol or drugs before or while
operating this ATV.
● Never operate at speeds too fast for your skills
or the riding conditions. Always go at a speed that is proper for the terrain, visibility, operating conditions, and your experience.
● Never attempt wheelies, jumps, or other stunts.
2-1
2
● Always inspect your ATV each time you use it to
make sure it is in safe operating condition. Al­ways follow the inspection and maintenance procedures and schedules described in this
2
manual.
● Always keep both hands on the handlebars and
both feet on the footboards of the ATV during operation.
● Always go slowly and be extra careful when op-
erating on unfamiliar terrain. Always be alert to changing terrain conditions when operating the ATV.
● Never operate on excessively rough, slippery or
loose terrain until you have learned and prac­ticed the skills necessary to control the ATV on such terrain. Always be especially cautious on these kinds of terrain.
● Always follow proper procedures for turning as
described in this manual. Practice turning at low speeds before attempting to turn at faster speeds and never turn at excessive speeds.
● Never operate the ATV on hills too steep for the
ATV or for your abilities. Practice on smaller hills before attempting larger hills.
● Always follow proper procedures for climbing
hills as described in this manual. Check the ter­rain carefully before you start up any hill. Never climb hills with excessively slippery or loose sur­faces. Shift your weight forward. Never open the throttle suddenly. Never go over the top of a hill at high speed.
● Always follow proper procedures for going down
hills and for braking on hills as described in this manual. Check the terrain carefully before you start down any hill. Shift your weight backward. Never go down a hill at high speed. Avoid going down a hill at an angle that would cause the ve­hicle to lean sharply to one side. Go straight down the hill where possible.
● Always follow proper procedures for crossing
the side of a hill as described in this manual. Avoid hills with excessively slippery or loose sur­faces. Shift your weight to the uphill side of the ATV. Never attempt to turn the ATV around on any hill until you have mastered the turning tech­nique described in this manual on level ground. Avoid crossing the side of a steep hill if possible.
● Always use proper procedures if you stall or roll
backwards when climbing a hill. To avoid stall­ing, maintain a steady speed when climbing a
2-2
hill. If you stall or roll backwards, follow the spe­cial procedure for braking described in this man­ual. Dismount on the uphill side or to a side if pointed straight uphill. Turn the ATV around and remount, following the procedure described in this manual.
● Always check for obstacles before operating in a
new area.
● Never attempt to operate over large obstacles,
such as large rocks or fallen trees. Always follow proper procedures when operating over obsta­cles as described in this manual.
● Always be careful when skidding or sliding.
Learn to safely control skidding or sliding by practicing at low speeds and on level, smooth terrain. On extremely slippery surfaces, such as ice, go slowly and be very cautious in order to re­duce the chance of skidding or sliding out of con­trol.
● Never operate an ATV in fast flowing water or in
water deeper than that recommended in this manual. Remember that wet brakes may have reduced stopping ability. Test your brakes after leaving water. If necessary, apply them several times to let friction dry out the linings.
● Always be sure there are no obstacles or people
behind you when you operate in reverse. When it is safe to proceed in reverse, go slowly.
● Always use the size and type of tires specified in
this manual.
● Always maintain proper tire pressure as de-
scribed in this manual.
● Never modify an ATV through improper installa-
tion or use of accessories.
● Never exceed the stated load capacity for an
ATV. Cargo should be properly distributed and securely attached. Reduce speed and follow in­structions in this manual for carrying cargo. Al­low greater distance for braking.
2
2-3
EWB00071
WARNING
Avoid Carbon Monoxide Poisoning All engine exhaust contains carbon monoxide,
2
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 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 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 engine in poorly ventilated or par-
tially enclosed areas such as barns, garages, or carports.
● Do not run engine outdoors where engine
exhaust can be drawn into a building through openings such as windows and doors.
EWB02591
WARNING
When transporting the ATV in another vehicle, be sure it is kept upright and that the fuel cock is in the “OFF” position. Otherwise, fuel may leak out of the carburetor or fuel tank.
2-4
FOR MORE INFORMATION ABOUT ATV SAFE­TY, call the Consumer Products Safety Commis-
sion at 1-800-638-2772, or the ATV Distributor’s Safety Hotline at 1-800-852-5344.
2
2-5

DESCRIPTION

Left view

3
1. Front shock absorber assembly spring preload adjusting ring
2. Fuel cock
3. Air filter case
4. Fuses
5. Storage compartment and tool kit
6. Seat lock lever
7. Rear shock absorber assembly spring preload adjusting ring
8. Engine oil filler cap
9. Oil filter cartridge
10.Coolant reservoir
11.V-belt cooling duct check hose

Right view

1. Spark arrester
2. Tail/brake light
3. Battery
4. Spark plug
5. Rear brake fluid reservoir
6. Radiator cap
7. Front shock absorber assembly spring preload adjusting ring
8. Rear brake light switch
9. Brake pedal
10.V-belt case drain plug
3-1

Controls and instruments

1. Rear brake lever
2. Handlebar switches
3. Starter (choke)
4. Drive select lever
5. Main switch
6. Speedometer unit
7. Fuel tank cap
8. Front brake fluid reservoir
9. On-Command four-wheel-drive switch
10.Front brake lever
11.Throttle lever
TIP
The ATV you have purchased may differ slightly from the figures shown in this manual.
3
3-2

INSTRUMENT AND CONTROL FUNCTIONS

EWB00011
WARNING
Indicates a hazardous situation which, if not avoided, could result in death or serious injury.
4

Main switch

The positions of the main switch are as follows:
ON
All electrical systems are supplied with power. The headlights and taillight come on when the light switch is on, and the engine can be started. The key cannot be removed.
OFF
All electrical systems are off. The key can be re­moved.
1. Main switch
4-1

Indicator lights and warning light

1. Coolant temperature warning light “”
2. Neutral indicator light “N”
3. Reverse indicator light “R”
4. Park indicator light “P”
5. On-Command four-wheel-drive indicator “”
Reverse indicator light “”
This indicator light comes on when the transmis­sion is in the reverse position. Furthermore, this indicator light flashes when the engine is being raced for 10 seconds or more.
TIP
If the indicator light flashes under any other circum­stances or the speedometer does not show the speed while riding, have a Yamaha dealer check the speed sensor circuit.
Neutral indicator light “”
This indicator light comes on when the transmis­sion is in the neutral position.
Coolant temperature warning light “”
This warning light comes on when the engine over­heats. When this occurs during operation, stop the engine as soon as it is safe to do so and allow it to cool down for about 10 minutes. The electrical circuit of the warning light can be checked by turning the key to “ON”. The warning light should come on for a few seconds, and then go off. If the warning light does not come on initially when the key is turned to “ON”, or if the warning light re­mains on, have a Yamaha dealer check the electri­cal circuit.
4
4-2
NOTICE
● The engine may overheat if the ATV is over-
loaded. In this case, reduce the load to spec­ification.
● Start the engine after making sure that the
warning light is out. Continuous use while the warning light is on may cause damage to
4
the engine.
On-Command four-wheel-drive indicator “”
This indicator comes on when the On-Command four-wheel-drive switch is set to the “4WD” posi­tion.
TIP
Due to the synchronizing mechanism in the differ­ential gear case, the indicator may not come on un­til the ATV starts moving.
Park indicator light “”
This indicator light comes on when the transmis­sion is in the park position.

Speedometer unit

1. Speedometer
2. Odometer/tripmeter
3. “SELECT” button
The speedometer unit is equipped with the follow­ing:
● a speedometer
● an odometer
● a tripmeter (which shows the distance traveled
since it was last set to zero)
Odometer and tripmeter modes
Pushing the “SELECT” button switches the display between the odometer mode “ODO” and the trip­meter mode “TRIP” in the following order:
4-3
ODO → TRIP → ODO To reset the tripmeter, select it by pushing the “SE- LECT” button, and then push the “SELECT” button for at least three seconds. The tripmeter can be used to estimate the distance that can be traveled with a full tank of fuel. This information will enable you to plan future fuel stops.

Handlebar switches

TIP
Pushing and holding in the “SELECT” button, then turning the key to “ON” while the button is pushed, switches the display between “mph” and “km/h”.
4
1. Light switch “ //OFF”
2. Engine stop switch “ / ”
3. Start switch “”
Engine stop switch “ / ”
Set this switch to “” before starting the engine. The engine stop switch controls the ignition and stops the engine when it is running. Use this switch to stop the engine in an emergency situation. The engine will not start or run when this switch is set to “”.
4-4
Start switch “”
Push this switch to crank the engine with the start­er. See the starting instructions on page 6-1 prior to starting the engine.
Light switch “ //OFF”
Set this switch to “” to turn on the low beams
4
and the taillight. Set the switch to “” to turn on the high beams and the taillight. Set the switch to “OFF” to turn off all the lights.
NOTICE
Do not use the headlights with the engine turned off for an extended period of time, oth­erwise the battery may discharge to the point that the starter motor will not operate properly. If this should happen, remove the battery and recharge it. See page 8-48 for battery charging information.
On-Command four-wheel-drive switch “2WD”/“4WD”
EWB00163
WARNING
Always stop the ATV before changing from two-wheel drive to four-wheel drive and vice versa. The ATV handles differently in two­wheel drive than in four-wheel drive in some circumstances. Changing from two-wheel drive to four-wheel drive or vice versa while moving may cause the ATV to unexpectedly handle differently. This could distract the oper­ator and increase the risk of losing control and of causing an accident.
This ATV is equipped with a switch to change from two-wheel drive to four-wheel drive and vice versa. Select the appropriate drive according to the ter­rain and the conditions.
● “2WD” (two-wheel drive): Power is supplied to
the rear wheels.
● “4WD” (four-wheel drive): Power is supplied to
the rear and front wheels.
4-5
To change from two-wheel drive to four-wheel drive, stop the ATV and push the switch in to the “4WD” position. Then, the four-wheel-drive indicator “” comes on in the speedometer unit display. To change from four-wheel drive to two-wheel drive, stop the ATV and push the switch in to the “2WD” position.
1. On-Command four-wheel-drive switch “2WD”/“4WD”

Throttle lever

Once the engine is running, pushing the throttle le­ver will increase the engine speed.
Regulate the speed of the ATV by varying the throttle position. Because the throttle is spring­loaded, the ATV will decelerate, and the engine will return to an idle any time the throttle lever is re­leased.
4
1. Throttle lever
Before starting the engine, check the throttle to be sure it is operating smoothly. Make sure it returns to the idle position as soon as the lever is released.
4-6

Speed limiter

Your ATV is equipped with an adjustable speed limiter. The speed limiter keeps the throttle from fully opening, even when the throttle lever is pushed to the maximum.
1. Loosen the locknut.
2. To increase the maximum engine power avail-
4
able and the maximum speed of the ATV, turn the adjusting screw in direction (a). To de­crease the maximum engine power available and the maximum speed of the ATV, turn the adjusting screw in direction (b). Do not turn the adjusting screw out more than 12 mm (0.47 in) or the throttle cable could be dam­aged. Always make sure the throttle lever free play is adjusted to 3.0–5.0 mm (0.12–0.20 in). (See page 8-38.) WARNING! Improper ad-
justment of the speed limiter and throttle could cause throttle cable damage or im­proper throttle operation. You could lose control, resulting in an accident.
[EWB00241]
1. Locknut
2. Adjusting screw
3. No more than 12 mm (0.47 in)
3. Tighten the locknut.

Front brake lever

The front brake lever is located on the right handle­bar. To apply the front brake, pull the brake lever toward the handlebar grip.
4-7
1. Front brake lever 1. Brake pedal

Brake pedal and rear brake lever

The brake pedal is located on the right side of the ATV and the rear brake lever is located on the left handlebar. To apply the rear brake, push down on the brake pedal or pull the brake lever toward the handlebar grip.
1. Rear brake lever
4-8
4

Drive select lever

The drive select lever is used to shift your ATV into the forward, neutral, reverse and park positions. See the “Operating the drive select lever and driv­ing in reverse” section on page 6-3 for the drive se­lect lever operation.
4
1. Drive select lever

Fuel tank cap

Remove the fuel tank cap by turning it counter­clockwise.
1. Fuel tank cap

Fuel

Make sure there is sufficient gasoline in the tank.
EWB02521
WARNING
Gasoline and gasoline vapors are extremely flammable. To avoid fires and explosions and to reduce the risk of injury when refueling, fol­low these instructions.
1. Before refueling, turn off the engine and be sure that no one is sitting on the vehicle. Nev­er refuel while smoking, or while in the vicinity
4-9
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. When refueling, be sure to insert the pump nozzle into the fuel tank filler hole. 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. Maximum fuel level
2. Fuel tank filler tube
Recommended fuel:
UNLEADED GASOLINE ONLY
Fuel tank capacity:
14.5 L (3.83 US gal, 3.19 Imp.gal)
Fuel reserve amount:
4.5 L (1.19 US gal, 0.99 Imp.gal)
3. Wipe up any spilled fuel immediately.
NOTICE: Immediately wipe off spilled fuel with a clean, dry, soft cloth, since fuel may deteriorate painted surfaces or plastic parts.
[ECB00981]
4. Turn the fuel tank cap fully clockwise to make sure it is securely closed.
EWB02531
WARNING
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.
4
4-10
NOTICE
Use only unleaded gasoline. The use of leaded gasoline will cause severe damage to internal engine parts, such as the valves and piston rings, as well as to the exhaust system.

Fuel cock

The fuel cock supplies fuel from the tank to the car­buretor while also filtering it. The fuel cock lever positions are explained as fol­lows and shown in the illustrations.
Your Yamaha engine has been designed to use
4
regular unleaded gasoline with a pump octane number [(R+M)/2] of 86 or higher, or a research oc­tane number of 91 or higher. If knocking (or ping­ing) occurs, use a gasoline of a different brand. Use of unleaded fuel will extend spark plug life and reduce maintenance costs.
Gasohol
There are two types of gasohol: gasohol contain­ing ethanol and that containing methanol. Gasohol containing ethanol can be used if the ethanol con­tent does not exceed 10% (E10). Gasohol contain­ing methanol is not recommended by Yamaha because it can cause damage to the fuel system or vehicle performance problems.
OFF
1. Arrow mark positioned over “OFF”
With the fuel cock lever in this position, fuel will not flow. Always turn the fuel cock lever to this position when the engine is not running.
4-11
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