5UG-F8199-11LIT-11626-18-46READ THIS MANUAL CAREFULLY!It contains important safety information.YXR660FATOWNER’S MANUALPRINTED IN USA2004.08-2.8×1 CR(E
1-1EVU000601-LOCATION OF THE WARNING AND SPECIFICATION LABELSEE.book Page 1 Tuesday, July 27, 2004 5:17 PM
8-13EVU00710Final gear oilChecking the final gear oil level1. Place the vehicle on a level surface.2. Remove the oil filler bolt, and then checkthe oi
8-14Changing the final gear oil1. Place the vehicle on a level surface.2. Place a container under the final gearcase to collect the used oil.3. Remove
8-15EVU00720Differential gear oilChecking the differential gear oil1. Place the vehicle on a level surface.2. Remove the differential gear oil filler
8-161. Differential gear oil drain bolt4. Install the differential gear oil drain bolt,and tighten it to the specified torque.5. Fill the differential
8-17EVU00730CoolantThe coolant level should be checked beforeeach ride.Checking the coolant level1. Place the vehicle on a level surface.2. Open the h
8-18CAUTION:_ Mix anti freeze with distilled water only.However, if distilled water is not available,soft water may be used for refilling._Changing th
8-19EVU00740Axle bootsCheck the protective boots for holes or tears.If any damage is found, have them replacedby a Yamaha dealer. 1. Front axle boot (
8-20EVU00750Spark plug inspectionRemoval1. Lift the cargo bed up. (See pages 4-18–4-21 for cargo bed lifting and loweringprocedures.)2. Remove the spa
8-21InspectionThe spark plug is an important engine compo-nent and is easy to inspect. The condition ofthe spark plug can indicate the condition ofthe
8-223. Install the spark plug and tighten it to thespecified torque.NOTE:_ If a torque wrench is not available when youare installing the spark plug,
1-21234567891011121314Read and understand all of the labels on yourvehicle. They contain important informationfor safe and proper operation of your ve
8-231. Air filter element 2. Air intake duct grill3. Remove any large particles from the airfilter element by hand.4. Tap the air filter element to re
8-24Cleaning the engine air filter elementNOTE:_ There is a check hose at the bottom of the airfilter case. If dust or water collects in thishose, emp
8-251. Air filter element1. Air filter frame 2. Air filter element3. Element retaining plate6. Wash the air filter element gently butthoroughly in sol
8-269. Thoroughly apply Yamaha foam air filteroil or other quality liquid foam air filter oil(not spray type) to the air filter element.NOTE:_ The air
8-27CAUTION:_ Never operate the engine with the air filterelement removed. This will allow unfilteredair to enter, causing rapid engine wear andpossib
8-28EVU00780V-belt case drain plugThe V-belt case drain plug is located underthe driver seat. (See page 4-15 for seat re-moval and installation proced
8-29EVU00790Spark arrester cleaningBe sure the exhaust pipe and muffler are coolbefore cleaning the spark arrester.1. Remove the bolts.2. Remove the t
8-30EVU00800Carburetor adjustmentThe carburetor is a vital part of the engine andrequires very sophisticated adjustment. Mostadjusting should be left
8-31EVU00810Idle speed adjustmentNOTE:_ A diagnostic tachometer must be used for thisprocedure. _1. Start the engine and warm it up for a fewminutes a
8-32EVU00830Front brake pad check Each brake pad is provided with wear indica-tor grooves, which allow you to check thebrake pad wear without having t
1-334WARNINGYAMAHA 5UG-K7764-00Keep hands, body, otherpersons away when closing bed.Do not operate the vehiclewith bed up.YAMAHA 5UG-F4897-00WARNINGSe
8-33EVU00840Rear brake pad check Each brake pad is provided with wear indica-tor grooves, which allow you to check thebrake pad wear without having to
8-34The brake fluid reservoir is located under thehood. (See pages 8-6–8-7 for hood openingand closing procedures.)Observe these precautions:●When che
8-35EVU01220Checking the brake pedalHave a Yamaha dealer check the brakes atthe intervals specified in the periodic mainte-nance and lubrication chart
8-36EVU00870Parking brake lever free play adjustmentPeriodically check the parking brake lever freeplay and adjust it if necessary.1. Shift the drive
8-371. Locknut 2. Adjusting nut6. Turn the adjusting nut in direction a toincrease the free play or in direction b todecrease the free play.7. Tighten
8-381. Brake light switch 2. Adjusting nut3. Close the hood.EVU00890Cable inspection and lubricationLubricate the inner cables and the cable ends.If t
8-39EVU00900Brake pedal and accelerator pedal lubricationLubricate the pivoting parts.EVU00910Rear knuckle upper and lower pivot lubrication Lubricate
8-40EVU00920Steering shaft lubrication Lubricate the pivot points.EVU00930Wheel removal1. Loosen the wheel nuts.2. Elevate the vehicle and place a sui
8-41EVU00940Wheel installation1. Install the wheel and the nuts.NOTE:_ ●The arrow mark on the tire must pointtoward the rotating direction of the wh
8-42EVU00950BatteryThis vehicle is equipped with a sealed-typebattery. Therefore it is not necessary to checkthe electrolyte or add distilled water in
1-456YAMAHA 5UG-F151J-00MAX 7.3 INCH(185MM)YAMAHA 5UG-F151K-02Improperly loading a trailer and failure to use extra care when pulling trailer can caus
8-43EVU00960Battery maintenance1. When the vehicle is not used for a monthor longer, remove the battery and store itin a cool, dark place. Completely
8-44EVU00970Fuse replacementThe main fuse and the fuse box are locatedunder the hood. (See pages 8-6–8-7 for hoodopening and closing procedures.)If a
8-454. Turn the key to “ON” and turn on theelectrical circuit in question to check if thedevice operates.5. If the fuse immediately blows again, havea
8-46EVU00980Replacing a headlight bulbIf a headlight bulb burns out, replace it as fol-lows.1. Lift the hood up. (See pages 8-6–8-7 forhood opening an
8-475. Insert a new headlight bulb into the bulbholder, and then hook the headlight bulbholder tabs.6. Install the headlight bulb holder by turn-ing i
8-48EVU01000Tail/brake light bulb replacementIf a tail/brake light bulb burns out, replace it asfollows:1. Remove panel A (if replacing the left tail/
8-492. Remove the bulb holder (together withthe bulb) by turning it counterclockwise.1. Tail/brake light bulb holder3. Push the defective bulb in and
8-50EVU01010TroubleshootingAlthough Yamaha vehicles receive a rigid in-spection before shipment from the factory,trouble may occur during operation. A
8-51EVU01020Troubleshooting chartsStarting problems or poor engine performance1. FuelCheck if there is fuelin the fuel tank.There is fuel.No fuel.Fuel
8-52Engine overheatingNOTE:_ If it is difficult to get the recommended coolant, tap water can be temporarily used, provided thatit is changed to the r
1-5785UG-F1558-00Turning the off road vehicle in 4WD-LOCK (“DIFF.LOCK”) takes more effort.Operate at a slow speed and allow extra time and distance fo
9-1EVU010301-CLEANING AND STORAGEA. CLEANINGFrequent, thorough cleaning of your vehiclewill not only enhance its appearance but willimprove its genera
9-212345678910111213146. Clean the seats with a vinyl upholsterycleaner to keep the cover pliable andglossy.7. Automotive type wax may be applied toal
9-3EVU01040B. STORAGELong term storage (60 days or more) of yourvehicle will require some preventive proce-dures to guard against deterioration. After
9-48. Remove the battery and charge it. Storeit in a dry place and recharge it once amonth. Do not store the battery in an ex-cessively warm or cold p
10-1EVU010501-SPECIFICATIONS Model YXR660FADimensions:Overall length 2,885 mm (113.6 in)Overall width 1,385 mm (54.5 in)Overall height 1,853 mm (73.0
10-21234567891011121314Engine oil:Type10° 30° 50° 70° 90° 110°0° 130°F-10° 0° 10° 20° 30° 40°-20° 50°CYAMALUBE 4 (20W40) or SAE 20W40YAMALUBE 4 (10W30
10-3Final gear case oil:Type SAE80 API GL-4 Hypoid gear oilQuantity: 0.25 L (0.22 Imp qt, 0.26 US qt)Differential gear case oil:Type SAE80 API GL-4 Hy
10-4Transmission:Primary reduction system V-beltSecondary reduction system Shaft driveSecondary reduction ratio 41/21 × 24/18 × 33/9 (9.544)Transmissi
10-5Brakes:System Front and rear unifiedType front Dual disc brakerear Single disc brakeOperation Foot operationSuspension:Front suspension Double wis
10-6Bulb voltage, wattage × quantity:Headlight 12 V 30 W/30.0 W × 2Tail/brake light 12 V 5 W/21.0 W × 2Indicator lights:Neutral indicator light 12 V 1
2-11234567891011121314SAFETY INFORMATIONEVU00070This off-highway utility vehicle handles differently from other vehicles including cars and ATVs.SEVER
11-1EVU010601-NOISE REGULATIONTAMPERING WITH NOISE CONTROL SYSTEM PROHIBITED:Federal law prohibits the following acts or the causing thereof: (1) The
12-11234567891011121314EVU010701-MAINTENANCE RECORDCopies of work orders and/or receipts for parts you purchase and install will be required to docu-m
13-1EVU01080YAMAHA MOTOR CORPORATION, U.S.A. SIDE × SIDE VEHICLE LIMITED WARRANTY Yamaha Motor Corporation, U.S.A. hereby warrants that new Yamaha Sid
14-11234567891011121314EVU01090YAMAHA EXTENDED SERVICE (Y.E.S.) EE.book Page 1 Tuesday, July 27, 2004 5:17 PM
14-2EE.book Page 2 Tuesday, July 27, 2004 5:17 PM
5UG-F8199-11LIT-11626-18-46READ THIS MANUAL CAREFULLY!It contains important safety information.YXR660FATOWNER’S MANUALPRINTED IN USA2004.08-2.8×1 CR(E
2-2●Always inspect your vehicle each time you use it to be sure it is in safe operating condition. Al-ways follow the inspection and maintenance proce
2-3●Never operate on hills that are slippery or ones where you will not be able to see far enoughahead of you. Never go over the top of a hill at spee
2-4WARNINGPOTENTIAL HAZARD Improper handling of gasoline. WHAT CAN HAPPEN Gasoline can catch fire and you couldbe burned. HOW TO AVOID THE HAZARD Alwa
2-5WARNINGPOTENTIAL HAZARD Starting or running the engine in aclosed area. WHAT CAN HAPPEN Exhaust fumes are poisonous and maycause loss of consciousn
3-1EVU000801-DESCRIPTION AND VEHICLE IDENTIFICATION1. Headlights2. Front shock absorber assembly adjusting ring3. Brake fluid reservoir4. Air filter e
3-2123456789101112131424. Light switch25. Steering wheel26. Starter (choke)27. Main switch28. On-Command four-wheel drive and differential gear lock s
3-3EVU00090Identification number recordsRecord the key identification number, vehicleidentification number and model label infor-mation in the spaces
3-4EVU00110Vehicle identification numberThe vehicle identification number is stampedinto the frame.1. Vehicle identification numberNOTE:_ The vehicle
4-1EVU001301-CONTROL FUNCTIONSEVU00140 Main switch 1. Main switchFunctions of the respective switch positionsare as follows: ON: All electrical circui
4-21234567891011121314CAUTION:_ ●Do not operate the electric startercontinuously for more than 5 sec-onds, or starter damage could occur.Wait at least
4-3EVU00150Indicator and warning lights 1. Parking brake indicator light “P”2. Reverse indicator light “R”3. Neutral indicator light “N”4. Four-wheel-
4-4EVU00200Four-wheel-drive indicator light “”This indicator light comes on when the “2WD/4WD” switch is in the “4WD” position.NOTE:_ Due to the synch
4-5EVU00190Coolant temperature warning light checking methodTurn the main switch to “ON”.Coolant temperature warning light does not come on.Coolant te
4-6EVU00230Switches1. Light switch “OFF/ / ”EVU00240 Light switch “OFF/ / ” Set the switch to “” to turn on the low beamand the taillights. Set the sw
EVU000101-INTRODUCTION Congratulations on your purchase of the Yamaha YXR660FA. It represents the result of manyyears of Yamaha experience in the prod
4-7EVU00250 On-Command four-wheel drive and differ-ential gear lock switches 1. On-Command four-wheel drive switch “2WD”/“4WD”2. Differential gear loc
4-8On-Command four-wheel drive switch“2WD”/“4WD” 1. Lever2. On-Command four-wheel drive switch “2WD”/“4WD”To change from 2WD to 4WD, stop the vehi-cle
4-9Differential gear lock switch “LOCK”/“4WD” 1. Differential gear lock switch “LOCK”/“4WD” 2. LeverTo lock the differential gear in 4WD, stop thevehi
4-10NOTE:_ ●If the differential gear lock is not engag-ing properly, turn the steering wheel backand forth to help it engage. ●Riding before the diffe
4-11Before starting the engine, check the acceler-ator pedal to be sure it is operating smoothly.Make sure the accelerator pedal fully returnsto the i
4-12EVU00280 Parking brake lever The parking brake lever is located at the rightside of the driver’s seat. It will help hold thevehicle from moving wh
4-13EVU00290Drive select leverThe drive select lever is used to shift your ve-hicle into the low, high, neutral and reversepositions. (Refer to pages
4-14EVU00310Fuel level check windowThe amount of fuel in the fuel tank can bechecked through the fuel level check window.If the fuel level is low, ref
4-15EVU00330 Seats To remove a seat, pull its seat lock lever up-ward, lift the front of the seat, and then slidethe seat forward and up.1. Driver sea
4-16EVU00340Seat beltsThis vehicle is equipped with three-point seatbelts for both the operator and passenger. Al-ways wear the seat belt while riding
EVU000201-IMPORTANT MANUAL INFORMATIONFAILURE TO FOLLOW THE WARNINGS CONTAINED IN THIS MANUAL CAN RESULT INSERIOUS INJURY OR DEATH.Particularly import
4-173. Put the lap portion of the belt low on yourhips. Push down on the buckle end of thebelt as you pull up on the shoulder part sothe belt is snug
4-18EVU01191Glove compartmentCAUTION:_ To protect from damage, do not put metalproducts, like tools or sharply edged prod-ucts directly in the glove c
4-19Opening and closing the tailgate1. Tailgate 2. Latch (× 2)To open Unhook the latches, and then lower the tail-gate. To close Place the tailgate in
4-20WARNINGPOTENTIAL HAZARDPinch points.WHAT CAN HAPPENYou or someone else could be pinchedbetween the cargo bed and the framewhen the bed is being lo
4-21EVU00360 Front and rear shock absorber adjustment The spring preload can be adjusted to suit theoperating conditions. You can reduce preload for a
4-221. Spring preload adjusting ring2. Position indicatorNOTE:_ A special wrench can be obtained at aYamaha dealer to make this adjustment. _1. Specia
4-23EVU00370 Trailer hitch bracket This vehicle is equipped with a 5 cm (2 in) re-ceiver bracket for a standard trailer hitch.Trailer towing equipment
4-24EVU00380Auxiliary DC jackThe auxiliary DC jack is located at the rightside of the front panel. The auxiliary DC jack can be used for suitablework
4-254. When the auxiliary DC jack is not beingused, cover it with the cap.CAUTION:_ ●Do not use accessories requiringmore than the above maximum capac
5-11234567891011121314EVU012001-PRE-OPERATION CHECKSBefore using this vehicle, check the following points:ITEM ROUTINE PAGEBrakes• Check operation, fr
AFFIX DEALERLABEL HEREEVU000302-IMPORTANT NOTICE ●This vehicle is designed and manufactured for off-road use only. It is illegal to operatethis vehicl
5-2EVU00390 Front and rear brakes Brake pedal Check for correct brake pedal free play. If thebrake pedal free play is incorrect, have aYamaha dealer a
5-3Brake fluid leakage Check to see if any brake fluid is leaking out ofthe pipe joints or the brake fluid reservoir. Ap-ply the brakes firmly for one
5-4EVU00400 Fuel Make sure there is sufficient gasoline in thetank.CAUTION:_ Use only unleaded gasoline. The use ofleaded gasoline will cause severe d
5-5EVU00410Engine oilMake sure the engine oil is at the specifiedlevel. Add oil as necessary. (See pages 8-9–8-12.)CAUTION:_ ●In order to prevent clut
5-6EVU00420Coolant Check the coolant level in the coolant reser-voir when the engine is cold. (The coolant lev-el will vary with engine temperature.)
5-7EVU00430Final gear oilMake sure the final gear oil is at the specifiedlevel. Add oil as necessary. (See pages 8-13–8-14 for details.)If desired, an
5-8EVU01230SteeringPark on level ground. Turn the steering wheelright and left. Check for excessive free play,abnormal noises, or a rough feeling. Hav
5-92. The tires should be set to the rec-ommended pressure:●Recommended tire pressureFront 70 kPa (0.70 kgf/cm2, 10 psi)Rear 98 kPa (0.98 kgf/cm2, 14
5-10EVU00510How to measure tire pressureUse the tire pressure gauge.NOTE:_ The tire pressure gauge is included as stan-dard equipment. Make two measur
5-11EVU00520Tire wear limitWhen the tire groove decreases to 3 mm(0.12 in) due to wear, replace the tire. a. Tire wear limitEE.book Page 11 Tuesday,
EVU00050CONTENTSLOCATION OF THE WARNING AND SPECIFICATION LABELS... 1-1SAFETY INFORMATION... 2-1DESCRIPTION AND VEHICLE IDENTIFICAT
6-1EVU005301-OPERATIONEVU00540 Starting a cold engine1. Apply the brake. 2. Shift the drive select lever into the neutralposition.WARNINGPOTENTIAL HAZ
6-21234567891011121314NOTE:_ ●When the drive select lever is in the neu-tral position, the neutral indicator lightshould come on. If the neutral indic
6-3NOTE:_ If the engine fails to start, release the key, andthen try starting again. Wait a few secondsbefore the next attempt. Each cranking shouldbe
6-44. Using a charged 12 V battery, connectthe positive lead of the jumper cable tothe positive terminal of the battery in thevehicle and the other en
6-5EVU00570 Warming up To get maximum engine life, always warm upthe engine before starting off. Never acceler-ate hard with a cold engine! To see whe
6-6Shifting: Neutral to Reverse 1. Stop the vehicle. Keep your foot off theaccelerator pedal.2. Apply the brake pedal. 3. Shift from neutral to revers
6-75. Press the accelerator pedal graduallyand continue to watch to the rear whilebacking.EVU00590Engine break-inThere is never a more important perio
6-8Each full throttle acceleration sequenceshould be followed with a substantial rest pe-riod for the engine by cruising at lower r/minso the engine c
6-9EVU01210ParkingWhen parking, stop the engine and shift thedrive select lever into the neutral position. Ap-ply the parking brake to help prevent th
6-101. Bring the vehicle to a stop by applying thebrakes. 2. Stop the engine. 3. With the brakes applied, set the parkingbrake.NOTE:Like many other ve
Switches... 5-8Tires ... 5-8How to measure tire pressure... 5-
6-11EVU00610Accessories and loading EVU00620 Accessories Accessories can affect the handling and con-trol of your vehicle. Keep the following in mindw
6-12EVU00630 Loading Cargo or a trailer can change the stability andhandling of a vehicle. You must use common sense and good judg-ment when carrying
6-13●Make sure the load does not interfere withcontrols or your ability to see where you aregoing.●Drive more slowly than you would without aload. The
7-11234567891011121314EVU006401-DRIVING YOUR VEHICLEGETTING TO KNOW YOUR VEHICLEThis off-highway utility vehicle will handle andmaneuver differently f
7-2The total weight of operator, passenger, ac-cessories, cargo, trailer tongue weight, andthe vehicle itself must not exceed 907 kg(2,000 lb). (See “
7-3The driver and passenger must always wear aseat belt and an approved motorcycle helmet.Also wear eye protection and protective cloth-ing, including
7-4WARNINGPOTENTIAL HAZARD Operating this vehicle without wearingan approved motorcycle helmet, eyeprotection, and protective clothing. WHAT CAN HAPPE
7-5LEARNING TO OPERATE YOUR VEHICLE You should become familiar with the perfor-mance characteristics of the vehicle in a large,flat area that is free
7-6CAUTION:_ Do not shift from low to high or vice versawithout coming to a complete stop andwaiting for the engine to return to normalidle speed. Dam
7-7BRAKING Braking ability is affected by the type of ter-rain. In most cases, gradually application ofthe brakes is more effective than abrupt brak-i
Cleaning the air filter elements... 8-22V-belt cooling duct check hose ... 8-27V-belt case drain plug... 8-28Spark arrester clea
7-8Before climbing the hill, first be sure you areoperating in low range 4WD or, if necessary,with 4WD Diff. Lock. To climb a hill, you needtraction,
7-9If you start to lose traction or momentumwhen climbing, and you decide you will be un-able to continue, use the brakes to come to astop. Do not att
7-10Before starting down hill, make sure the vehi-cle is in low-range 4WD. On most slopes, thiswill let you use engine braking to help you godownhill
7-11CROSSING THROUGH SHALLOW WATER If you must cross shallow, slow moving waterup to the depth of the vehicle’s floorboards,choose your path carefully
7-12CAUTION:_ After riding your vehicle in water, be sureto drain the trapped water by removing thecheck hose at the bottom of the air filtercase, the
7-131. Drive select lever box check hose1. V-belt case drain plugRIDING OVER ROUGH TERRAIN Operating over rough terrain should be donewith caution. Lo
7-14RIDING IN BRUSH OR WOODED AREAS When operating in areas with brush or trees,watch carefully on both sides and above thevehicle for obstacles such
7-15ENCOUNTERING OBSTACLES ON THE TRAIL If you cannot go around an obstacle such as afallen tree trunk or a ditch, stop the vehiclewhere it is safe to
8-1EVU006501-PERIODIC MAINTENANCE AND ADJUSTMENTPeriodic inspection, adjustment and lubrica-tion will keep your vehicle in the safest andmost efficien
8-212345678910111213141. Owner’s tool kit 2. Tire pressure gaugeThe service information included in this man-ual is intended to provide you, the owner
YAMAHA MOTOR CORPORATION, U.S.A. SIDE × SIDE VEHICLE LIMITED WARRANTY ... 13-1YAMAHA EXTENDED SERVICE (Y.E.S.) ...
8-3WARNINGPOTENTIAL HAZARDOperating this vehicle with impropermodifications.WHAT CAN HAPPENImproper installation of accessories ormodification of this
8-4EVU00670PERIODIC MAINTENANCE/LUBRICATIONNOTE:● For vehicles not equipped with an odometer or hour meter, follow the month maintenance intervals.● F
8-5* Since these items require special tools, data and technical skills have a Yamaha dealer perform the service.NOTE:● Recommended brake fluid: DOT 4
8-6EVU00680HoodTo openUnhook the hood latches, and then slowly tiltthe hood up until it stops.1. Latch (× 2)1. HoodEE.book Page 6 Tuesday, July 27,
8-7To closeLower the hood slowly to its original position,and then hook the hood latches.Secure projections 1 on the underside of thehood into slots 2
8-8EVU00690ConsoleTo remove1. Remove the seats. (See page 4-15 forseat removal and installation proce-dures.)2. Remove the parking brake lever boot.3.
8-9EVU00700Engine oil and oil filter cartridgeThe engine oil level should be checked beforeeach operation. In addition, the oil must bechanged and the
8-10To change the engine oil (with or withoutoil filter cartridge replacement)1. Remove the console. (See page 8-8 forconsole removal and installation
8-116. Apply a light coat of engine oil to theO-ring of the new oil filter cartridge.NOTE:_ Make sure the O-ring is seated properly. _1. O-ring7. Inst
8-12CAUTION:_ ●In order to prevent clutch slippage(since the engine oil also lubricatesthe clutch), do not mix any chemicaladditives. Do not use oils
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