Page 1 READ THIS MANUAL CAREFULLY! It contains important safety information. OWNER’S MANUAL YFM660FR WARNING This ATV should not be ridden by anyone under 16 years of age. LIT-11626-16-34 5KM-28199-11...
Page 2 EBU00776...
Page 3 Yamaha experience in the production of fine sporting, touring, and pace-setting racing machines. With the purchase of this Yamaha, you can now appreciate the high degree of crafts- manship and reliability that have made Yamaha a leader in these fields.
Page 4: Warning
EBU00801 I MPORTANT 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: The Safety Alert Symbol means ATTENTION! BECOME ALERT! YOUR SAFETY IS INVOLVED! Failure to follow WARNING instructions could result in severe WARNING...
Page 5 Please check your local riding laws and regulations before operating this machine. EBU00981 YFM660FR OWNER’S MANUAL ©2002 by Yamaha Motor Corporation, AFFIX DEALER U.S.A. 1st edition, May 2002 LABEL HERE All rights reserved.
Page 6: Table Of Contents
EBU00014 CONTROL FUNCTIONS....4-1 WARNING Main switch ........4-1 Indicates a potential hazard that could Indicator and warning lights .....4-2 result in serious injury or death. Speedometer unit ......4-5 Fuel gauge ........4-6 Handlebar switches ......4-7 CONTENTS Throttle lever ........4-12 Speed limiter ........4-13 Front brake lever......4-14 LOCATION OF THE WARNING Rear brake pedal and lever ...4-14...
Page 7 PRE-OPERATION CHECKS ... 5-1 Engine break-in ....... 6-7 Front and rear brakes ..... 5-2 Parking..........6-8 Fuel ..........5-4 Parking on a slope......6-9 Engine oil ........5-6 Accessories and loading ....6-10 Final gear oil........5-7 Differential gear oil ......5-7 RIDING YOUR ATV ......
Page 8 PERIODIC MAINTENANCE AND Front brake adjustment....8-39 ADJUSTMENT........8-1 Rear brake lever and pedal Owner’s manual and tool kit.... 8-1 adjustment ........8-40 Periodic maintenance/lubrication ..8-3 Adjusting the rear brake light Panel removal and installation ..8-5 switch ...........8-42 Engine oil........8-12 Cable inspection and lubrication..8-43 Final gear oil ........
Page 9 CLEANING AND STORAGE.... 9-1 A. Cleaning........9-1 B. Storage ........9-3 SPECIFICATIONS......10-1 NOISE REGULATION....11-1 MAINTENANCE RECORD .... 12-1 ATV LIMITED WARRANTY ... 13-1 YAMAHA EXTENDED SERVICE (Y.E.S.) ........... 14-1...
Page 10: Location Of The Warning And Specification Labels
EBU00464 LOCATION OF THE WARNING AND SPECIFICATION LABELS...
Page 11 NEVER sit here. 3MX-24875-A0 Never remove any labels from your ATV. If a label becomes difficult to read or comes off, a replacement label is available from your Yamaha dealer. LOAD LIMIT 85 kg {187 lbs} 4WV-24877-A0 MAXIMUM LOADING LIMIT...
Page 13 WARNING UNDER Operating this ATV if you are under the age of 16 increases your chance of severe injury or death. NEVER operate this ATV if you are under age 16. 5FE-21697-01 WARNING Turning the ATV in 4WD-LOCK(“DIFF. LOCK”) takes more effort. Operate at a slow speed and allow extra time and distance for maneuvers to avoid loss of control.
Page 14: Safety Information
EBU01129 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.
Page 15 Never operate an ATV without wearing an approved motorcycle helmet that fits properly. You should also wear eye protection (goggles or face shield), gloves, boots, long-sleeved shirt or 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 conditions.
Page 16 Always follow proper procedures for climbing hills as described in this manual. Check the ter- rain 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.
Page 17 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 op- erating over obstacles as described in this manual. Always be careful when skidding or sliding. Learn to safely control skidding or sliding by prac- ticing at low speeds and on level, smooth terrain.
Page 18 WARNING When transporting the ATV in another vehicle, be sure it is kept upright and POTENTIAL HAZARD that the fuel cock is in the “OFF” posi- Improper handling of gasoline. tion. Otherwise, fuel may leak out of the WHAT CAN HAPPEN carburetor or fuel tank.
Page 19 WARNING POTENTIAL HAZARD Starting or running the engine in a closed area. WHAT CAN HAPPEN Exhaust fumes are poisonous and may cause loss of consciousness and death within a short time. HOW TO AVOID THE HAZARD Always operate your ATV in an area with adequate ventilation.
Page 20: Description And Machine Identification
EBU00032 DESCRIPTION AND MACHINE IDENTIFICATION 1. Rear shock absorber spring 15. Engine oil dipstick preload adjusting ring 16. Recoil starter 2. Storage compartment and tool kit 17. Coolant reservoir 3. Air filter case 18. Drive select lever box check hose 4.
Page 21: Identification Number Records
This number can be used for ordering a new when ordering spare parts from a Yamaha key. dealer or for reference in case the vehicle is stolen.
Page 22: Vehicle Identification Number
Record the information on this la- bel in the space provided. This information will be needed to order spare parts from your Yamaha dealer. 1. Vehicle identification number NOTE: The vehicle identification number is used to 1.
Page 23: Control Functions
EBU00039 CONTROL FUNCTIONS WARNING Indicates a potential hazard that could result in serious injury or death. EBU00942 Main switch Functions of the respective switch positions are as follows: 1. Main switch The engine can be started only at this position and the headlights and taillight come on when the light switch is on.
Page 24: Indicator And Warning Lights
EBU00802 EBU01130 Indicator and warning lights Differential gear lock indicator light “DIFF. LOCK” This indicator light comes on along with the differential gear lock indicator in the display when the differential gear lock switch is set to the “LOCK-4WD” position. EBU01122 Low-range indicator light “L”...
Page 25 If the indicator light flashes or the speedome- when the “LOCK”-“4WD” switch is set to the ter does not show the speed while riding, “LOCK-4WD” position. have a Yamaha dealer check the speed sen- sor circuit. NOTE: Due to the synchronizing mechanism in the...
Page 26 EBU00860 Coolant temperature warning light “ ” When the coolant temperature reaches a specified level, this light comes on to warn that the coolant temperature is too hot. If the light comes on during operation, stop the en- gine as soon as it is safe to do so and allow the engine to cool down for about 10 minutes.
Page 27: Speedometer Unit
EBU01132 Speedometer unit a clock an hour meter (which shows the total time the key has been turned to “ON”) Odometer and tripmeter modes Pushing the “TRIP/ODO” button switches the display between the odometer mode “ODO” and the tripmeter modes “A” and “B” in the fol- lowing order: ODO→TRIP A→TRIP B→ODO To reset a tripmeter, select it by pushing the...
Page 28: Fuel Gauge
EBU00843 Clock mode Fuel gauge Pushing the “ ”/“ ” button for at least two The fuel gauge indicates the amount of fuel in seconds switches the display between the the fuel tank. The display segments of the fuel clock mode “CLOCK” and the hour meter gauge disappear towards “E”...
Page 29: Handlebar Switches
EBU00053 Handlebar switches CAUTION: Do not use the headlights with the engine turned off for more than thirty minutes. 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. EBU00849 Engine stop switch “...
Page 30 EBU00607 Start switch “ ” The starter motor cranks the engine when this switch is pushed. CAUTION: See starting instructions prior to starting the engine. (See page 6-1 for details.) 1. On-command four-wheel drive switch “2WD”/“4WD” 2. Differential gear lock switch “LOCK”/“4WD” EBU00842 On-command four-wheel drive and differ- ential gear lock switches...
Page 31 Four-wheel drive (4WD): Power is supplied WARNING to the rear and front wheels. POTENTIAL HAZARD Four-wheel drive with the differential gear Changing from 2WD to 4WD or from locked (4WD-LOCK): Power is supplied to 4WD to 4WD-LOCK (“DIFF.LOCK”), or the rear and front wheels when the differen- vice-versa while the ATV is moving.
Page 32 1. Lever 1. Differential gear lock switch “LOCK”/“4WD” 2. On-command four-wheel drive switch “2WD”/“4WD” 2. Lever On-command four-wheel drive switch Differential gear lock switch “LOCK”/ “4WD” “2WD”/“4WD” To lock the differential gear in 4WD, make sure To change from 2WD to 4WD, stop the ATV, the on-command four-wheel-drive switch is set and then set the switch to “4WD”.
Page 33 NOTE: WARNING When the switch is set to “LOCK”, the dif- POTENTIAL HAZARD ferential gear lock indicator light will flash Riding too fast while the ATV is in 4WD- until the differential gear is locked. LOCK. When the indicator light is flashing, turn- WHAT CAN HAPPEN ing the handlebar back and forth will help All wheels turn at the same speed when...
Page 34: Throttle Lever
Check the operation of the throttle lever before you start the engine. If it does not work smoothly, check for the cause. Correct the problem before riding the ATV. Consult a Yamaha dealer if you 1. Throttle lever can’t find or solve the problem yourself. 4-12...
Page 35: Speed Limiter
EBU00066 Speed limiter WARNING The speed limiter keeps the throttle from fully POTENTIAL HAZARD opening, even when the throttle lever is Improper adjustment of the speed limit- pushed to the maximum. Screwing in the ad- er and throttle. juster limits the maximum engine power avail- WHAT CAN HAPPEN able and decreases the maximum speed of The throttle cable could be damaged.
Page 36: Front Brake Lever
EBU00070 Front brake lever The front brake lever is located on the right handlebar. Pull it toward the handlebar to ap- ply the front brake. 1. Rear brake pedal 1. Front brake lever EBU00073 Rear brake pedal and lever The brake pedal is located on the right side of the machine and the brake lever is located on the left handlebar.
Page 37: Drive Select Lever
EBU00608 Drive select lever The drive select lever is used to shift your ma- chine into the low, high, neutral, reverse and park positions. (Refer to page 6-4 for the drive select lever operation.) 1. Drive select lever 4-15...
Page 38: Recoil Starter
EBU00855 Recoil starter WARNING Firmly grasp the handle and pull slightly until POTENTIAL HAZARD engagement can be felt. Then pull forcefully, Starting the engine without setting the being careful not to pull the rope all the way drive select lever to the park position out.
Page 39: Fuel Tank Cap
EBU00092 Fuel tank cap Remove the fuel tank cap by turning it coun- terclockwise. 1. Fuel tank cap 4-17...
Page 40: Fuel Cock
EBU00093 Fuel cock OFF Position The fuel cock supplies fuel from the fuel tank to the carburetor. The fuel cock has three positions. OFF: With the lever in this position fuel will not flow. Always turn the lever to this position when the engine is not running.
Page 41: Starter (Choke)
EBU00095 Starter (choke) “ ” RES Position Starting a cold engine requires a richer air-fuel mixture. A separate starter circuit supplies this mixture. Move in direction a to turn on the starter (choke). Move in direction b to turn off the starter (choke).
Page 42: Seat
EBU00567 Seat To install the seat, insert the projections on To remove the seat, pull the seat lock lever the front of the seat into the seat holders and upward and pull up the seat at the rear. push down on the seat at the rear. NOTE: Make sure that the seat is securely fitted.
Page 43: Storage Compartment
EBU00858 EBU00582 Storage compartment Front carrier The storage compartment is located under Maximum load limit: 45 kg (99 lb) the seat. (See page 4-20 for seat removal and installation procedures.) When storing the owner’s manual or other EBU00583 documents in the storage compartment, be Rear carrier sure to wrap them in a plastic bag so that they Maximum load limit: 85 kg (187 lb)
Page 44: Front And Rear Shock Absorber Adjustment
NOTE: To decrease the spring preload, turn the ad- A special wrench can be obtained at a justing ring in direction b. Yamaha dealer to make this adjustment. Standard position: B A- Minimum (soft) E- Maximum (hard) 4-22...
Page 45 WARNING POTENTIAL HAZARD Improper shock absorber adjustment. WHAT CAN HAPPEN Uneven adjustment can cause poor handling and loss of stability, which could lead to an accident. HOW TO AVOID THE HAZARD Always adjust the shock absorbers on 1. Special wrench the left and right side to the same set- ting.
Page 46: Auxiliary Dc Jack
EBU01002 Auxiliary DC jack The auxiliary DC jack is located at the front right side of the ATV. The auxiliary DC jack can be used for suitable work lights, radios, etc. The auxiliary DC jack should only be used when the engine is running. 1.
Page 47 4. When the auxiliary DC jack is not being used, cover it with the cap. CAUTION: Do not use accessories requiring more than the above maximum capac- ity. This may overload the circuit and cause the fuse to blow. If accessories are used without the engine running or with the headlights turned on, the battery will lose its charge and engine starting may be-...
Page 49: Pre-Operation Checks
PRE-OPERATION CHECKS Before using this machine, check the following points: ITEM ROUTINE PAGE • Check operation, free play, fluid level and fluid leakage. 5-2–5-3, Brakes • Fill with DOT 4 brake fluid if necessary. 8-36–8-42 • Check fuel level. Fuel 5-4–5-5 •...
Page 50: Front And Rear Brakes
If not, have the machine inspect- HOW TO AVOID THE HAZARD ed by a Yamaha dealer. Always inspect your ATV each time you use it to make sure the ATV is in safe op- Brake fluid level erating condition.
Page 51 If there is any brakes. leaking, have the machine inspected by a WHAT CAN HAPPEN Yamaha dealer. You could lose braking ability, which could lead to an accident. Brake operation HOW TO AVOID THE HAZARD...
Page 52: Fuel
Yamaha because it may cause fuel system and piston rings, as well as to the exhaust damage or vehicle performance problems.
Page 53 WARNING POTENTIAL HAZARD Improper care when refueling. WHAT CAN HAPPEN Fuel can spill, which can cause a fire and severe injury. Fuel expands when it heats up. If the fuel tank is overfilled, fuel could spill out due to heat from the engine or the sun. 1.
Page 54: Engine Oil
EBU01084 Engine oil CAUTION: Make sure the engine oil is at the specified In order to prevent clutch slippage level. Add oil as necessary. (See page 8-12.) (since the engine oil also lubricates the clutch), do not mix any chemical Recommended oil: additives.
Page 55: Final Gear Oil
EBU00493 EBU00678 Final gear oil Differential gear oil Make sure the final gear oil is at the specified Make sure the differential gear oil is at the level. Add oil as necessary. (See pages 8-16– specified level. Add oil as necessary. (See 8-17 for details.) pages 8-18–8-19 for details.) Recommended oil:...
Page 56 WARNING CAUTION: POTENTIAL HAZARD Hard water or salt water is harmful to the Removing the radiator cap when the en- engine. You may use distilled water if you gine and radiator are still hot. cannot get soft water. WHAT CAN HAPPEN You could be burned by hot fluid and Coolant reservoir capacity: steam blown out under pressure.
Page 57: Throttle Lever
EBU00152 Fittings and Fasteners Always check the tightness of chassis fittings and fasteners before a ride. Take the machine to a Yamaha dealer or refer to the Service Manual for correct tightening torque. EBU00991 Lights Check the headlights and tail/brake light to make sure they are in working condition.
Page 58: Tires
HOW TO AVOID THE HAZARD riding conditions. 1. The tires listed below have been ap- The following are minimums: proved by Yamaha Motor Co., Ltd. Front 32 kPa (0.32 kgf/cm , 4.6 psi) for this model. Other tire combina- Rear 27 kPa (0.27 kgf/cm , 3.9 psi)
Page 59 4. Use no more than the following pressures when seating the tire beads. Front 250 kPa (2.5 kgf/cm , 36 psi) Rear 250 kPa (2.5 kgf/cm , 36 psi) Higher pressures may cause the tire to burst. Inflate the tires very slowly and carefully.
Page 60: How To Measure Tire Pressure
EBU00159 How to measure tire pressure Use the low-pressure tire gauge. NOTE: The low-pressure tire gauge is included as standard equipment. Make two measure- ments of the tire pressure and use the second reading. Dust or dirt in the gauge could cause the first reading to be incorrect.
Page 61: Tire Wear Limit
EBU00160 Tire wear limit When the tire groove decreases to 3 mm (0.12 in) due to wear, replace the tire. a. 3 mm (0.12 in) 5-13...
Page 62: Operation
3. Turn the main switch to “ON” and the en- there is a control or function you do not gine stop switch to “ ”. understand, ask your Yamaha dealer. 4. Shift the drive select lever into the neutral or park position.
Page 63 25 °C (80 °F) and warm engine does not come on, ask a Yamaha dealer start position. to inspect its electric circuit. The engine can be started in any gear if the rear brake lever is applied.
Page 64: Starting A Warm Engine
NOTE: CAUTION: If the engine fails to start, release the See the “Engine break-in” section prior to start switch, then push the start switch operating the engine for the first time. again. Pause a few seconds before the next attempt. Each cranking should be as short as possible to preserve battery en- EBU00180 ergy.
Page 65: Drive Select Lever Operation And Reverse Driving
EBU00846 Drive select lever operation and reverse driving CAUTION: Before shifting, you must stop the ma- chine and return the throttle lever to the closed position. Otherwise, the transmis- sion may be damaged. Shifting: Neutral to High and High to Low 1.
Page 66 If the light does not the drive select lever along the shift come on, ask a Yamaha dealer to inspect guide. the reverse indicator light electrical cir- cuit.
Page 67 5. Open the throttle lever gradually and con- tinue to watch to the rear while backing. WARNING POTENTIAL HAZARD Improperly operating in reverse. WHAT CAN HAPPEN You could hit an obstacle or person be- hind you, resulting in serious injury. HOW TO AVOID THE HAZARD When you shift into reverse, make sure there are no obstacles or people behind...
Page 68: Engine Break-In
For this reason, we ask that you carefully read build up of heat. If any abnormality is noticed the following material. Because the engine is during this period, consult a Yamaha dealer. brand new, you must not put an excessive 1. 0–10 hours: load on it for the first several hours of running.
Page 69: Parking
EBU00612 2. 10–20 hours: Parking Avoid prolonged operation above 3/4 When parking, stop the engine and shift the throttle. Rev the machine freely but do drive select lever into the park position, then not use full throttle at any time. turn the fuel cock to the “OFF”...
Page 70: Parking On A Slope
EBU00615 Parking on a slope 1. Bring the machine to a stop by applying the brakes. WARNING 2. Stop the engine. POTENTIAL HAZARD 3. With the rear brake applied, shift the Parking on a hill or other incline. drive select lever to the park position. WHAT CAN HAPPEN The ATV could roll out of control, in- creasing the chance of an accident.
Page 71: Accessories And Loading
Choose only accessories designed for your dlebars which could make steering difficult, ATV. Your Yamaha dealer has a variety of an accessory that limits your ability to move genuine Yamaha accessories. Other ac-...
Page 72 EBU00960 Loading Do not exceed the maximum tongue Cargo or a trailer can change the stability and weight. You can measure tongue weight handling of an ATV. with a bathroom scale. Put the tongue of You must use common sense and good judg- the loaded trailer on the scale with the ment when carrying cargo or towing a trailer.
Page 73 Ride more slowly than you would without a WARNING load. The more weight you carry, the slow- POTENTIAL HAZARD er you should go. Although conditions vary, Overloading this ATV or carrying or tow- it is good practice not to exceed low range ing cargo improperly.
Page 74 EBU00956 WARNING Indicates a potential hazard that could result in serious injury or death. 6-13...
Page 75: Riding Your Atv
Riding Your...
Page 77: Getting To Know Your Atv
WARNING Indicates a potential hazard that could result in serious injury or death. ride, be sure you have read this Owner’s Man- GETTING TO KNOW YOUR ATV ual completely and understand the operation of This ATV is mainly for utility use, but may also the controls.
Page 78: Ride With Care And Good Judgement
JUDGEMENT Beginning and inexperienced operators should complete the certified training Get training if you are inexperienced. course offered by Yamaha. They should Beginners should get training from a certified then regularly practice the skills learned instructor. in the course and the operating tech- Become familiar with this ATV at slow speeds niques described in this Owner’s Manu-...
Page 79 Not recommended for children under 16 years of age. WARNING POTENTIAL HAZARD Failure to follow the age recommenda- tions for this ATV. WHAT CAN HAPPEN Use by children of ATVs that are not rec- ommended for their age can lead to se- vere injury or death of the child.
Page 80 This machine is designed to carry operator and cargo only - passengers prohibited. WARNING POTENTIAL HAZARD Carrying a passenger on this ATV. WHAT CAN HAPPEN Greatly reduces your ability to balance and control this ATV. Could cause an accident, resulting in harm to you and/ or your passenger.
Page 81 Apparel Operating without protective clothing WARNING increases your chances of severe injury in the event of an accident. Apparel HOW TO AVOID THE HAZARD POTENTIAL HAZARD Always wear an approved motorcycle Operating this ATV without wearing an helmet that fits properly. approved motorcycle helmet, eye pro- You should also wear: tection and protective clothing.
Page 82 Do not operate after consuming alcohol or WARNING drugs. POTENTIAL HAZARD Operator’s performance capability is reduced Operating this ATV after consuming al- by the influence of alcohol or drugs. cohol or drugs. WHAT CAN HAPPEN Could seriously affect your judgment. Could cause you to react more slowly.
Page 83 Pre-operation checks WARNING Always perform the pre-operation checks list- POTENTIAL HAZARD ed on page 5-1 before riding for safety and Operating this ATV with improper tires, proper care of the machine. or with improper or uneven tire pres- WARNING sure. POTENTIAL HAZARD WHAT CAN HAPPEN Failure to inspect the ATV before oper-...
Page 84 Speed limiter WARNING For riders less experienced with this model, Indicates a potential hazard that could this model is equipped with a speed limiter in result in serious injury or death. the throttle lever housing. The speed limiter keeps the throttle from fully opening, even Do not operate at speeds too fast for your when the throttle lever is pushed to the maxi- skills or the conditions.
Page 85 Loading and accessories WARNING Use extra caution when riding the machine POTENTIAL HAZARD with additional loads, such as accessories or Overloading this ATV or carrying or tow- cargo. The machine’s handling may be ad- ing cargo improperly. versely affected. Reduce your speed when WHAT CAN HAPPEN adding additional loads.
Page 86 During operation WARNING Always keep your feet on the footboards dur- POTENTIAL HAZARD ing operation. Otherwise your feet may con- Removing hands from handlebars or tact the rear wheels. feet from footboards during operation. WHAT CAN HAPPEN Removing even one hand or foot can re- duce your ability to control the ATV or could cause you to lose your balance and fall off of the ATV.
Page 87 Avoid wheelies and jumping. You may lose control of the machine or overturn. WARNING POTENTIAL HAZARD Attempting wheelies, jumps, and other stunts. WHAT CAN HAPPEN Increases the chance of an accident, in- cluding an overturn. HOW TO AVOID THE HAZARD Never attempt stunts, such as wheelies or jumps.
Page 88 Never modify this ATV through improp- er installation or use of accessories. All parts and accessories added to this ve- hicle should be genuine Yamaha or equivalent components designed for use on this ATV and should be installed and used according to instructions. If you have questions, consult an autho- rized ATV dealer.
Page 89 Exhaust system Do not touch the hot exhaust system. The exhaust system on the machine is very Do not park the machine in a place hot during and following operation. To prevent where others might be likely to touch it. burns, avoid touching the exhaust system.
Page 90: Be Careful Where You Ride
BE CAREFUL WHERE YOU RIDE This machine is designed for off-road use only. Riding on paved surfaces can cause loss of control. WARNING POTENTIAL HAZARD Operating this ATV on paved surfaces. WHAT CAN HAPPEN ATVs are designed for off-road use only. Paved surfaces may seriously affect handling and control of the ATV, and may cause the vehicle to go out of con-...
Page 91 Do not ride on any public road, street, or high- way. Riding on public roads can result in collisions with other vehicles. WARNING POTENTIAL HAZARD Operating this ATV on public streets, roads or highways. WHAT CAN HAPPEN You can collide with another vehicle. HOW TO AVOID THE HAZARD Never operate this ATV on any public street, road or highway, even a dirt or...
Page 92 Know the terrain where you ride. Ride cau- tiously in unfamiliar areas. Stay alert for holes, rocks, or roots in the terrain, and oth- er hidden hazards which may cause the ma- chine to upset. WARNING POTENTIAL HAZARD Failure to use extra care when operating this ATV on unfamiliar terrain.
Page 93 WARNING POTENTIAL HAZARD Failure to use extra care when operating on excessively rough, slippery or loose terrain. WHAT CAN HAPPEN Could cause loss of traction or vehicle control, which could result in an acci- dent, including an overturn. HOW TO AVOID THE HAZARD Do not operate on excessively rough, slippery or loose terrain until you have learned and practiced the skills neces-...
Page 94 When riding in an area where you might not WHAT CAN HAPPEN easily be seen, such as desert terrain, mount You could be in a collision. You could a caution flag on the machine. DO NOT use be injured. the flag pole bracket as a trailer hitch. HOW TO AVOID THE HAZARD Always mount a caution flag on the ma- chine to make you more visible.
Page 95 Select a large, flat area off-road to become fa- With the engine idling, shift the drive select le- miliar with your ATV. Make sure that this area ver to the low position “L” or the high position is free of obstacles and other riders. You “H”.
Page 96: Turning Your Atv
TURNING YOUR ATV HOW TO AVOID THE HAZARD To achieve maximum traction while riding off- Always follow proper procedures for road in 2WD or 4WD, the two rear wheels are turning as described in this Owner’s mounted solidly on one axle and turn together Manual.
Page 97 Once you have learned this technique you should be able to perform it at higher speeds or in tighter curves. Improper riding procedures such as abrupt throttle changes, excessive braking, incorrect body movements, or too much speed for the sharpness of the turn may cause the ATV to tip.
Page 98: Climbing Uphill
CLIMBING UPHILL HOW TO AVOID THE HAZARD Use proper riding techniques to avoid vehicle Never operate the ATV on hills too steep overturns on hills. Be sure that you can ma- for the ATV or for your abilities. Practice neuver your ATV well on flat ground before at- on smaller hills before attempting large tempting any incline and then practice riding hills.
Page 99 WARNING An obstacle, a sharp drop, or another vehicle or person could be on the other POTENTIAL HAZARD side of the hill. Climbing hills improperly. WHAT CAN HAPPEN Could cause loss of control or cause the ATV to overturn. HOW TO AVOID THE HAZARD Always follow proper procedures for climbing hills as described in this Own- er’s Manual.
Page 100 If you are climbing a hill and you find that you WARNING have not properly judged your ability to make POTENTIAL HAZARD it to the top, you should turn the ATV around Improperly crossing hills or turning on while you still have forward motion (provided hills.
Page 101 When crossing the side of a hill: Always follow proper procedures as de- scribed in the Owner’s Manual. Avoid hills with excessively slippery or loose surfaces. Shift your weight to the uphill side of the ATV. 7-27...
Page 102 If your ATV has stalled or stopped and you the front and rear brakes gradually, or dis- believe you can continue up the hill, restart mount the ATV immediately on the uphill side. carefully to make sure you do not lift the front WARNING wheels which could cause you to lose control.
Page 103 If you begin rolling backwards: Keep weight uphill. 2WD: Never apply the rear brake while rolling backwards. Apply the front brake. 4WD or 4WD-LOCK: Apply both front and rear brakes gradually. When fully stopped, shift to the park- ing position “P”. Dismount on uphill side or to a side if pointed straight uphill.
Page 104: Riding Downhill
RIDING DOWNHILL When this ATV is in 4WD or 4WD-LOCK, all When riding your ATV downhill, shift your wheels (front and rear) are interconnected by weight as far to the rear and uphill side of the the drive train. This means that applying either ATV as possible.
Page 105 WARNING POTENTIAL HAZARD Going down a hill improperly. WHAT CAN HAPPEN Could cause loss of control or cause the ATV to overturn. Always follow proper procedures for go- ing down hills as described in this Own- er’s Manual. Note: a special technique is required when braking as you go down a hill.
Page 106: Crossing A Slope
CROSSING A SLOPE WARNING Traversing a sloping surface on your ATV re- POTENTIAL HAZARD quires you to properly position your weight to Improperly crossing hills or turning on maintain proper balance. Be sure that you hills. have learned the basic riding skills on flat WHAT CAN HAPPEN ground before attempting to cross a sloping Could cause loss of control or cause the...
Page 107 7-33...
Page 108: Crossing Through Shallow Water
CROSSING THROUGH SHALLOW WATER Remember that wet brakes may have re- The ATV can be used to cross slow moving, duced stopping ability. Test your brakes shallow water of up to a maximum of 35 cm after leaving water. If necessary, apply (14 inches) in depth.
Page 109 Test your brakes after leaving the water. Do CAUTION: not continue to ride your ATV without verifying After riding your ATV in water, be sure to that you have regained proper braking ability. drain the trapped water by removing the check hose at the bottom of the air filter case and the check hose on the V-belt cooling duct.
Page 110 1. V-belt cooling duct check hose (Left side) 1. Drive select lever box check hose 1. V-belt case drain plug 7-36...
Page 111: Riding Over Rough Terrain
RIDING OVER ROUGH TERRAIN WARNING Riding over rough terrain should be done with POTENTIAL HAZARD caution. Look out for obstacles which could Improperly operating over obstacles. cause damage to the ATV or could lead to an WHAT CAN HAPPEN upset or accident. Be sure to keep your feet Could cause loss of control or a colli- firmly mounted on the footboards at all times.
Page 112: Sliding And Skidding
SLIDING AND SKIDDING If the rear wheels of your ATV start to slide Care should be used when riding on loose or sideways, control can usually be regained (if slippery surfaces since the ATV may slide. If there is room to do so) by steering in the direc- unexpected and uncorrected, sliding could tion of the slide.
Page 113 With practice, over a period of time, skill at WARNING controlled sliding can be developed. The ter- POTENTIAL HAZARD rain should be chosen carefully before at- Skidding or sliding improperly. tempting such maneuvers, since both stability WHAT CAN HAPPEN and control are reduced. Bear in mind that You may lose control of this ATV.
Page 114: What To Do If
WHAT TO DO IF ... If your ATV starts to slide sideways: This section is designed to be a reference Steer in the direction of the slide if you have guide only. Be sure to read each section on the room. Applying the brakes or accelerat- riding techniques completely.
Page 115 If your ATV is traversing a sloping surface: Be sure to ride with your weight positioned towards the uphill side of the ATV to main- tain proper balance. If the ATV starts to tip, steer down the hill (if there are no obstacles in your way) to regain balance.
Page 116: Periodic Maintenance And Adjustment
EBU00515 PERIODIC MAINTENANCE AND Have a Yamaha dealer perform service if ADJUSTMENT you are not familiar with machine service. Periodic inspection, adjustment and lubrica- tion will keep your machine in the safest and EBU00562 most efficient condition possible. Safety is an Owner’s manual and tool kit...
Page 117 HOW TO AVOID THE HAZARD during a service operation requiring one, take Never modify this ATV through improp- your machine to a Yamaha dealer to check er installation or use of accessories. All the torque settings and adjust them as neces- parts and accessories added to this ve- sary.
Page 118: Periodic Maintenance/Lubrication
EBU00261 PERIODIC MAINTENANCE/LUBRICATION INITIAL EVERY Whichever mile 1,500 1,500 3,000 ITEM ROUTINE comes first (km) (320) (1,200) (2,400) (2,400) (4,800) hours • Check valve clearance. Valves* • Adjust if necessary. • Check coolant leakage. Cooling system • Repair if necessary. •...
Page 119 • Check for cracks or damage. • Check all chassis fittings and fasteners. Fittings and Fasteners* • Correct if necessary. * It is recommended that these items be serviced by a Yamaha dealer. ** Lithium-soap-based grease NOTE: • Recommended brake fluid: DOT 4 •...
Page 120: Panel Removal And Installation
EBU00614 Panel removal and installation The panels illustrated need to be removed to perform some of the maintenance described in this chapter. Refer to this section each time a panel has to be removed or reinstalled. 4. Panel D 5. Panel E 6.
Page 121 EBU00879 Panels A and D To remove 1. Remove the seat. (See page 4-20 for seat removal and installation proce- dures.) 2. Pull outward on the area shown, and then pull upward as shown. 1. Panel D 1. Panel A...
Page 122 To install 1. Insert the panel projections in the numer- ical order shown in the illustration, and then push inward on the area shown. 2. Install the seat. 1. Panel D 1. Panel A...
Page 123 EBU00962 Panel B CAUTION: To remove When installing the panel, be sure not to Remove the bolts. pinch the cables or wires. To install Place the panel in the original position and in- stall the bolts. 1. Panel B 2. Bolt (× 2)
Page 124 EBU01141 Panel C To remove 1. Remove the front carrier by removing the stay covers at the rear, then by removing the bolts. 2. Remove the quick fasteners and pull the panel upward. 1. Bolt (× 2) 1. Front carrier stay cover (× 2) 1.
Page 125 To install 1. Place the panel in the original position and install the quick fasteners. 2. Install the front carrier by installing the bolts and tightening them to the specified torques. Tightening torques: Carrier bolt (top): 26 Nm (2.6 m·kgf, 19 ft·lbf) 1.
Page 126 EBU01013 EBU00638 Panel E Panel F To remove To remove Remove the bolts, and then take the panel off. Pull outward on the areas shown. To install Place the panel in the original position, and then install the bolts. 1. Panel F 1.
Page 127: Engine Oil
EBU01099 To install Engine oil Place the panel in its original position. Engine oil level measurement 1. Remove panel F. (See page 8-11 for panel removal and installation proce- dures.) 2. Place the ATV on a level surface and warm up the engine for several minutes. 3.
Page 128 Engine oil and oil filter cartridge replace- NOTE: ment Wait a few minutes until the oil level settles 1. Remove panels E and F. (See page 8-11 before checking. for panel removal and installation proce- 6. The oil level should be between the max- dures.) imum and minimum marks.
Page 129 5. Remove the oil filter cartridge by using an NOTE: oil filter wrench. An oil filter wrench is available at a nearby Yamaha dealer. 6. Install the drain bolt and tighten it to the specified torque. Tightening torque: Drain bolt: 30 Nm (3.0 m·kgf, 22 ft·lbf)
Page 130 9. Fill the engine with sufficient oil to reach the specified level. Install the engine oil filler cap and tighten it. Recommended engine oil: See page 10-2. Oil quantity: Total amount: 2.2 L (1.94 Imp qt, 2.33 US qt) Periodic oil change: 1.
Page 131: Final Gear Oil
In order to prevent clutch slippage leakage before each ride. If any leakage is (since the engine oil also lubricates found, have a Yamaha dealer check and re- the clutch), do not mix any chemical pair the ATV. additives. Do not use oils with a diesel specification of “CD”...
Page 132 Recommended oil: See page 10-3. Oil quantity: Periodic oil change: 0.25 L (0.22 Imp qt, 0.26 US qt) Total amount: 0.30 L (0.26 Imp qt, 0.32 US qt) CAUTION: 1. Final gear oil drain bolt Be sure no foreign material enters the final 4.
Page 133: Differential Gear Oil
EBU00706 Differential gear oil 3. Install the oil filler bolt and tighten it to the Differential gear oil measurement specified torque. 1. Place the machine on a level place. Tightening torque: 2. Remove the oil filler bolt and check the oil Oil filler bolt: level.
Page 134 4. Install the drain bolt and tighten it to the CAUTION: specified torque. Be sure no foreign material enters the dif- ferential gear case. Tightening torque: Drain bolt: 6. Install the filler bolt and tighten it to the 10 Nm (1.0 m·kgf, 7.2 ft·lbf) specified torque.
Page 135: Cooling System
EBU01068 Cooling system 3. Remove the coolant reservoir cap, and 1. Check the coolant level in the coolant then add coolant or distilled water to raise reservoir when the engine is cold as the it to the specified level. coolant level will vary with engine tem- 4.
Page 136 EBU00887 Changing the coolant NOTE: If water is added, have a Yamaha dealer WARNING check the antifreeze content of the cool- POTENTIAL HAZARD ant as soon as possible. Removing the radiator cap when the en- The radiator fan operation is completely gine and radiator are still hot.
Page 137 1. Place the ATV on a level surface. 2. Remove panels E and F. (See page 8-11 for panel removal and installation proce- dures.) 3. Place a container under the engine, and then remove the coolant drain bolt. (Use a trough or a similar object as shown to prevent coolant from spilling on the foot- rest.) 1.
Page 138 1. Radiator cap 1. Coolant reservoir drain hose 5. Remove the radiator cap. 8. After draining the coolant, thoroughly 6. Remove the coolant reservoir cap. flush the cooling system with clean tap 7. Disconnect the hose on the coolant res- water.
Page 139 Total amount: NOTE: 1.8 L (1.58 Imp qt, 1.90 US qt) If any leakage is found, have a Yamaha deal- Coolant reservoir capacity er check the cooling system. (up to the maximum level mark): 0.3 L (0.26 Imp qt, 0.32 US qt) 16.
Page 140: Axle Boots
EBU00862 Axle boots Check the protective boots for holes or tears. If any damage is found, have them replaced by a Yamaha dealer. 1. Rear axle boot (× 2 each side) 1. Front axle boot (× 2 each side) 8-25...
Page 141: Spark Plug Inspection
EBU00864 Spark plug inspection Removal 1. Remove panel A. (See pages 8-6–8-7 for panel removal and installation proce- dures.) 2. Remove the spark plug cap. 1. Spark plug wrench 1. Spark plug cap 3. Use the spark plug wrench in the tool kit to remove the spark plug as shown.
Page 142 ATV that is being ridden normally. Do not attempt to diagnose such problems yourself. Instead, take the ATV to a Yamaha dealer. You should periodically re- move and inspect the spark plug because heat and deposits will cause the spark plug to slowly break down and erode.
Page 143 Tightening torque: Spark plug: 17.5 Nm (1.75 m·kgf, 12.5 ft·lbf) NOTE: If a torque wrench is not available when you are installing a spark plug, a good estimate of the correct torque is 1/4 to 1/2 turn past finger tight. Have the spark plug tightened to the specified torque as soon as possible.
Page 144: Air Filter Element Cleaning
EBU00792 Air filter element cleaning NOTE: There is a check hose at the bottom of the air filter case. If dust or water collects in this hose, empty the hose and clean the air filter element and air filter case. 1.
Page 145 WARNING POTENTIAL HAZARD Using low flash point solvents or gaso- line to clean the air filter element. WHAT CAN HAPPEN Low flash point solvents or gasoline can catch fire or explode. HOW TO AVOID THE HAZARD Use parts cleaning solvent to clean the 1.
Page 146 7. Apply Yamaha foam air filter oil or other NOTE: The air filter element should be cleaned every quality foam air filter oil to the element. If 20–40 hours. It should be cleaned and lubri- foam air filter oil is not available, motor oil may be used.
Page 147: Spark Arrester Cleaning
EBU01066 Spark arrester cleaning Be sure the exhaust pipe and muffler are cool before cleaning the spark arrester. 1. Remove the bolts. 2. Remove the tailpipe by pulling it out of the muffler. 3. Tap the tailpipe lightly, and then use a wire brush to remove any carbon depos- its from the spark arrester portion of the tailpipe.
Page 148: V-Belt Cooling Duct Check Hose
EBU00874 V-belt cooling duct check hose WARNING If dust or water collects in the V-belt cooling POTENTIAL HAZARD duct check hose, remove the hose and clean Improper cleaning of the spark arrester. Hot exhaust system WHAT CAN HAPPEN Could injure the eyes. Could cause burns.
Page 149: Carburetor Adjustment
V-belt case, remove this plug to requires very sophisticated adjustment. Most drain the water from the case. adjusting should be left to a Yamaha dealer who has the professional knowledge and ex- NOTE: perience to do so. However, the idling speed...
Page 150: Idle Speed Adjustment
To prevent this, the valve clear- crease engine speed. ance must be adjusted regularly. This adjust- ment however, should be left to a professional Specified idle speed: Yamaha service technician. 1,450–1,550 r/min 8-35...
Page 151: Throttle Lever Adjustment
NOTE: If the thickness is less than the specified val- Adjust the engine idling speed before adjust- ue, have a Yamaha dealer replace the pads. ing the throttle lever free play. 1. Loosen the locknut. 2. Turn the adjusting bolt until the throttle le- ver free play is 3–5 mm (0.12–0.20 in).
Page 152: Rear Brake Pad Inspection
Insufficient brake fluid may let air enter the If the thickness is less than the specified val- brake system, possibly causing the brakes to ue, have a Yamaha dealer replace the pads. become ineffective. Before riding, check that the brake fluid is above the lower level and replenish when necessary.
Page 153 Observe these precautions: FRONT 1. When checking the fluid level, make sure the top of the master cylinder reservoir is level by turning the handlebars. 2. Use only the designated quality brake flu- id. Otherwise, the rubber seals may dete- riorate, causing leakage and poor brake performance.
Page 154: Brake Fluid Replacement
The front brake lever should have a free play spilled fluid immediately. of zero mm (zero in) at the lever end. If not, 6. Have a Yamaha dealer check the cause ask a Yamaha dealer to adjust it. if the brake fluid level goes down.
Page 155: Rear Brake Lever Free Play Adjustment
Make sure the brakes are not spongy. All air must be bled from 1. Locknut 2. Adjusting bolt c. Free play the brake system. Replacement of brake components re- quires professional knowledge. These procedures should be performed by a Yamaha dealer. 8-40...
Page 156 Yamaha dealer to make that adjustment. tioned 72 mm (2.8 in) above the top of the NOTE: footrest. If not, ask a Yamaha dealer to adjust When adjusting the rear brake lever free play: Be sure not to step on the brake pedal.
Page 157: Adjusting The Rear Brake Light Switch
Make sure the brakes do not drag. All air must be bled from the brake system. Replacement of brake components re- quires professional knowledge. These procedures should be performed by a Yamaha dealer. 1. Rear brake light switch 2. Adjusting nut 8-42...
Page 158: Cable Inspection And Lubrication
Inspect cables frequently. Replace dam- aged cables. Lubricate the inner cables and the cable ends. If the cables do not operate smoothly, ask a Yamaha dealer to replace them. Recommended lubricant: Yamaha chain and cable lube or SAE 10W30 motor oil 8-43...
Page 159: Rear Wheel Upper And Lower Knuckle Lubrication
EBU00877 Rear wheel upper and lower knuckle lubrication Lubricate the upper and lower wheel knuck- les. 1. Upper knuckle 2. Lower knuckle Recommended lubricant: Lithium-soap-based grease 8-44...
Page 160: Wheel Removal
EBU01112 EBU01121 Wheel removal Wheel installation 1. Loosen the wheel nuts. 1. Install the wheel and the nuts. 2. Elevate the ATV and place a suitable NOTE: stand under the frame. Tapered nuts are used for both the front 3. Remove the nuts from the wheel. and rear wheels.
Page 161 1. Tapered nut 2. Lower the ATV so that the wheel is on the ground. 3. Tighten the wheel nuts to the specified torque. Wheel nut torque: Front: 55 Nm (5.5 m·kgf, 40 ft·lbf) Rear: 55 Nm (5.5 m·kgf, 40 ft·lbf) 8-46...
Page 162: Battery
Keep out of reach of chil- tery. If the battery seems to have discharged, dren. consult a Yamaha dealer. Antidote: EXTERNAL: Flush with water. CAUTION: INTERNAL: Drink large quantities of wa- Do not try to remove the sealing caps of ter or milk.
Page 163: Battery Maintenance
EBU00385 Battery maintenance 1. When the machine is not used for a month or longer, remove the battery and store it in a cool, dark place. Completely recharge the battery before reinstallation. CAUTION: A special battery charger (constant volt- age/ampere or constant voltage) is re- quired recharging sealed-type...
Page 164: Fuse Replacement
2. If a fuse is blown, turn off the main switch and install a new fuse of the specified amperage. Then turn on the switches. If the fuse immediately blows again, con- sult a Yamaha dealer. 1. Main fuse 2. Spare fuse 3. Headlight fuse 4.
Page 165 WARNING POTENTIAL HAZARD Using an improper fuse. WHAT CAN HAPPEN An improper fuse can cause damage to the electrical system which could lead to a fire. HOW TO AVOID THE HAZARD Always use a fuse of the specified rat- ing. Never use a material in place of the proper fuse.
Page 166: Replacing A Headlight Bulb
EBU01125 Replacing a headlight bulb If a headlight bulb burns out, replace it as fol- lows. 1. Remove the bulb holder cover at the rear of the headlight by pulling it off. 1. Bulb holder cover 2. Remove the headlight bulb holder by turning it counterclockwise.
Page 167: Headlight Beam Adjustment
Headlight beam adjustment in and turning it counterclockwise. CAUTION: WARNING It is advisable to have a Yamaha dealer POTENTIAL HAZARD make this adjustment. A headlight bulb is hot when it is on and To raise the beam, turn the adjusting screw in immediately after it is turned off.
Page 168: Tail/Brake Light Bulb Replacement
EBU01105 Tail/brake light bulb replacement If the tail/brake light bulb burns out, have a Yamaha dealer replace it. 8-53...
Page 169: Troubleshooting
EBU00412 Troubleshooting WARNING Although Yamaha machines receive a rigid in- POTENTIAL HAZARD spection before shipment from the factory, Checking the fuel system while smok- trouble may occur during operation. Any prob- ing or near an open flame. lem in the fuel, compression, or ignition sys-...
Page 170: Troubleshooting Charts
No fuel. 2. Compression There is compression. Compression normal. Use the electric starter to see if there is compression. Ask a Yamaha dealer to No compression. inspect. 3. Ignition Wipe clean with dry cloth. Ignition system is Spark is good.
Page 171: Engine Overheating
Restart the engine. If the engine overheats again, ask a Level is OK. Yamaha dealer to inspect and/or repair the cooling system. NOTE: If it is difficult to get the recommended coolant, tap water can be temporarily used, provided that it is changed to the recommended coolant as soon as possible.
Page 172: Cleaning And Storage
EBU00419 CLEANING AND STORAGE CAUTION: ¯ Excessive water pressure may cause wa- A. CLEANING ter seepage and deterioration of wheel Frequent, thorough cleaning of your machine bearings, brakes, transmission seals and will not only enhance its appearance but will electrical devices. Many expensive repair improve its general performance and extend bills have resulted from improper high the useful life of many components.
Page 173 6. Clean the seat with a vinyl upholstery WARNING cleaner to keep the cover pliable and POTENTIAL HAZARD glossy. Operation with wet brakes after wash- 7. Automotive type wax may be applied to ing. all painted and chrome plated surfaces. WHAT CAN HAPPEN Avoid combination cleaner-waxes.
Page 174: Storage
Do not apply oil to fuel) any rubber parts or the seat cover. NOTE: Use of fuel stabilizer and conditioner elimi- nates the need to drain the fuel system. Con- sult a Yamaha dealer if the fuel system needs to be drained instead.
Page 175 7. Remove the battery and charge it. Store it in a dry place and recharge it once a month. Do not store the battery in an ex- cessively warm or cold place (less than 0 °C (30 °F) or more than 30 °C (90 °F)). NOTE: Make any necessary repairs before storing the machine.
Page 176: Specifications
EBU00428 SPECIFICATIONS Model YFM660F Dimensions: Overall length 2,085 mm (82.1 in) Overall width 1,150 mm (45.3 in) Overall height 1,210 mm (47.6 in) Seat height 880 mm (34.6 in) Wheelbase 1,275 mm (50.2 in) Minimum ground clearance 275 mm (10.8 in) Minimum turning radius 3,200 mm (126.0 in) Basic weight:...
Page 177 Model YFM660F Engine oil: 0° 10° 30° 50° 70° 90° 110° 130°F Type YAMALUBE 4 (20W40) or SAE 20W40 YAMALUBE 4 (10W30) or SAE 10W30 SAE 5W30 -20° -10° 0° 10° 20° 30° 40° 50°C Recommended engine oil classification API Service SE, SF, SG type or higher CAUTION: In order to prevent clutch slippage (since the en- gine oil also lubricates the clutch), do not mix any...
Page 178 Model YFM660F Final gear case oil: Type SAE80 API “GL-4” Hypoid gear oil Quantity: Periodic oil change 0.25 L (0.22 Imp qt, 0.26 US qt) Total amount 0.30 L (0.26 Imp qt, 0.32 US qt) Differential gear case oil: Type SAE80 API “GL-4”...
Page 179 Model YFM660F Spark plug: Type/manufacturer DPR8EA-9 / NGK Spark plug gap 0.8–0.9 mm (0.031–0.035 in) Clutch type Wet, centrifugal automatic Transmission: Primary reduction system V-belt Secondary reduction system Shaft drive 39/24 × 24/18 × 33/9 (7.944) Secondary reduction ratio Transmission type V-belt automatic Operation Left hand operation...
Page 180 Model YFM660F Brake: Front brake type Dual disc brake operation Right hand operation Rear brake type Single disc brake operation Left hand and right foot operation Suspension: Front suspension Double wishbone Rear suspension Double wishbone Shock absorber: Front shock absorber Coil spring / oil damper Rear shock absorber Coil spring / oil damper...
Page 181 Model YFM660F Bulb voltage, wattage × quantity: 12 V, 30 W / 30 W × 2 Headlight 12 V, 5 W / 21 W × 1 Tail/brake light Indicator light: LED × 1 Neutral indicator light LED × 1 Reverse indicator light LED ×...
Page 182: Noise Regulation
EBU00430 N OISE REGULATION TAMPERING WITH NOISE CONTROL SYSTEM PROHIBITED: Federal law prohibits the following acts or the causing thereof: (1) The removal or rendering inop- erative by any person other than for purposes of maintenance, repair, or replacement of any de- vice or element of design incorporated into any new vehicle for the purpose of noise control prior to its sale or delivery to the ultimate purchaser or while it is in use or (2) the use of the vehicle after such device or element of design has been removed or rendered inoperative by any person.
Page 183: Maintenance Record
EBU01126 M AINTENANCE RECORD Copies of work orders and/or receipts for parts you purchase and install will be required to docu- ment maintenance done in accordance with the warranty. The chart below is printed only as a re- minder to you that the maintenance work is required. It is not acceptable proof of maintenance work.
Page 184: Atv Limited Warranty
EBU00432 YAMAHA MOTOR CORPORATION, U.S.A. ATV LIMITED WARRANTY 13-1...
Page 185 13-2...
Page 186: Yamaha Extended Service (Y.e.s.)
EBU00435 YAMAHA EXTENDED SERVICE (Y.E.S.) 14-1...
Page 187 EBU00436 WARNING Indicates a potential hazard that could result in serious injury or death. 14-2...
Page 188 EBU00437...
Page 190 LOCATE AND READ OWNER’S MANUAL. FOLLOW ALL INSTRUCTIONS AND WARNINGS. (For replacement manual, call 1-800-532-1558) YAMAHA MOTOR CO., LTD. PRINTED ON RECYCLED PAPER PRINTED IN JAPAN 2002.06-7.8×1 CR...

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