1. Manuals
  2. Brands
  3. Yamaha Manuals
  4. Offroad Vehicle
  5. YFM 90 2021
  6. Owner's manual

Yamaha YFM 90 2021 Owner's Manual

Hide thumbs
Table of Contents

Advertisement

Quick Links

Download this manual
READ THIS MANUAL CAREFULLY!
It contains important safety information.
LIRE ATTENTIVEMENT CE MANUEL!
Il comprend d'importantes informations de sécurité.
¡LEA ESTE MANUAL ATENTAMENTE!
Contiene indicaciones importantes acerca de la seguridad.
MANUEL DU PROPRIÉTAIRE
MANUAL DEL PROPIETARIO
OWNER'S MANUAL
YFM90R
BD3-F8199-65

Advertisement

Table of Contents
loading

Related Manuals for Yamaha YFM 90 2021

Summary of Contents for Yamaha YFM 90 2021

  • Page 1 READ THIS MANUAL CAREFULLY! It contains important safety information. LIRE ATTENTIVEMENT CE MANUEL! Il comprend d’importantes informations de sécurité. ¡LEA ESTE MANUAL ATENTAMENTE! Contiene indicaciones importantes acerca de la seguridad. OWNER’S MANUAL MANUEL DU PROPRIÉTAIRE MANUAL DEL PROPIETARIO YFM90R BD3-F8199-65...
  • Page 2 Original instructions Notice originale Manual original PRINTED IN TAIWAN 2020.02 (E,F,S)
  • Page 3 READ THIS MANUAL CAREFULLY! It contains important safety information. OWNER’S MANUAL YFM90R WARNING This ATV should not be ridden by anyone under 10 years of age. BD3-F8199-65-E0...
  • Page 4 EBU28981 Read this manual carefully before operating this vehicle. This manual should stay with this ve- hicle if it is sold.
  • Page 5 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.
  • Page 6 Your ATV was delivered with an adjustable speed limiter. Yamaha recommends that all beginners start off to limit the amount of speed available while they learn. The adjusting screw may be gradually turned out as the beginner becomes more familiar with operating the ATV. Parents should decide when to adjust the ATV for more power as their youngster’s riding skills improve.
  • Page 7 EBU17331 IMPORTANT MANUAL INFORMATION EBU17344 FAILURE TO FOLLOW THE WARNINGS CONTAINED IN THIS MANUAL CAN RESULT IN SERIOUS IN- JURY 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 per- sonal injury hazards.
  • Page 8 Please check your local riding laws and regulations before operating this ATV. EBU33790 YFM90R OWNER’S MANUAL ©2021 by Yamaha Motor Co., Ltd. 1st edition, January 2020 All rights reserved. Any reprinting or unauthorized use without the written permission of Yamaha Motor Co., Ltd.

  • Page 9: Table Of Contents

    EBU17421 TABLE OF CONTENTS VEHICLE IDENTIFICATION ......1-1 Kickstarter ..........5-7 Identification numbers ........ 1-1 Fuel tank cap ..........5-8 Fuel ............. 5-9 LOCATION OF THE WARNING AND Fuel cock ..........5-10 SPECIFICATION LABELS ......2-1 Starter (choke) ......... 5-12 Seat ............
  • Page 10 Operating the drive select lever and Periodic maintenance chart: General driving in reverse........7-3 maintenance and lubrication ....9-5 Engine break-in ...........7-4 Checking the spark plug......9-9 Parking ............7-5 Engine oil ..........9-10 Parking on a slope ........7-5 Why Yamalube.......... 9-13 Accessories and loading ......7-6 Transmission oil........
  • Page 11 Replacing the fuse ........9-34 Removing a wheel........9-34 Installing a wheel........9-35 Troubleshooting ........9-36 Troubleshooting chart .......9-37 CLEANING AND STORAGE ......10-1 Cleaning ............ 10-1 Storage............10-2 SPECIFICATIONS ........11-1 INDEX............12-1...

  • Page 12: Vehicle Identification

    EBU38860 VEHICLE IDENTIFICATION EBU28205 Identification numbers Record the vehicle identification number and model label information in the spaces provided below. VEHICLE IDENTIFICATION NUMBER: MODEL LABEL INFORMATION: 1. Vehicle identification number EBU26053 Model label The model label is affixed at the location shown. EBU26032 Vehicle identification number The vehicle identification number is stamped into...
  • Page 13 1. Model label Your specific model can be identified by checking the model type code found on the model label. * * * * - * * * 1. Model type code 2. Production code 3. Color code...

  • Page 14: Location Of The Warning And Specification Labels

    Read and understand all of the labels on your ATV. These labels contain important information for safe and proper operation. Never remove any labels from your ATV. If a label becomes difficult to read or comes off, request a re- placement label from your Yamaha dealer.
  • Page 15 BD3-F816L-50 BW4-F817K-10 BD3-F816R-20...
  • Page 16 YAMAHA MOTOR CO., LTD. SHIZUOKA JAPAN YAMAHA BW4-F155A-00 25 kPa 25 kPa 0.25 kgf/cm² 0.25 kgf/cm² 3.6 psi 3.6 psi B8W-F816M-M0 BD3-F816P-50...
  • Page 17 Familiarize yourself with the following pictograms and read the explanatory text, then make sure to check the pictograms that apply to your model. Read the Owner’s manual. Use from 16 years old. Operating this ATV if you are under the age of 16 increases your chance of severe injury or death.
  • Page 18 This unit contains high-pressure nitrogen Measure the tire pressure when the tires are gas. cold. Mishandling can cause an explosion. Do not incinerate, puncture or open. EN228 fuel identification mark. Adjust the tire pressure. Gasoline of ethanol 5% or less can be used. Improper tire pressure can cause loss of control.

  • Page 19: Safety Information

    EBU17432 SAFETY INFORMATION SAFETY INFORMATION  Do not allow continued use of the ATV by a child EBU34093 if he or she does not have the abilities to operate AN ATV IS NOT A TOY AND CAN BE HAZARD- it safely. OUS TO OPERATE.
  • Page 20  Never operate at speeds too fast for your skills  Never operate the ATV on hills too steep for the or the riding conditions. Always go at a speed ATV or for your abilities. Practice on smaller hills that is proper for the terrain, visibility, operating before attempting larger hills.
  • Page 21  Never operate an ATV in fast flowing water or in technique described in this manual on level ground. Avoid crossing the side of a steep hill if water deeper than that recommended in this possible. manual. Remember that wet brakes may have ...
  • Page 22  Never maintain an ATV without proper knowl- vehicle. If the vehicle is in safe operating con- edge. Contact an authorized ATV dealer to in- dition and you can safely operate it, restart it form you on basic ATV maintenance. Certain and ride gently back to camp or other known maintenance can only be carried out by certified location where you can receive medical at-...
  • Page 23 While you may find aftermarket products similar in of the operator and may limit control ability, design and quality to genuine Yamaha accesso- therefore, such accessories are not recom- ries, recognize that some aftermarket accessories mended.
  • Page 24  Do not run engine in poorly ventilated or par- gerous loss of lights or engine power. Also, the battery tends to discharge more quickly if elec- tially enclosed areas such as barns, garages, trical accessories are added. or carports. ...

  • Page 26: Description

    EBU17681 DESCRIPTION EBU17691 EBU17701 Left view Right view 1 2 3 1. Fuel tank cap 1. Spark arrester 2. Fuel cock 2. Reflector 3. Air filter 3. Tool kit 4. Fuse 4. Front shock absorber 5. Battery 5. Spark plug 6.

  • Page 27: Controls And Instruments

    EBU17715 Controls and instruments 1. Rear brake lever 2. Handlebar switches 3. Parking brake lock plate 4. Starter (choke) lever 5. Main switch 6. Throttle lever 7. Front brake lever 8. Drive select lever...

  • Page 28: Instrument And Control Functions

    EBU17739 INSTRUMENT AND CONTROL FUNCTIONS EBU33850 EBU17794 Main switch Indicator lights The positions of the main switch are as follows: All electrical systems are supplied with power, and the engine can be started. The key cannot be re- moved. All electrical systems are off. The key can be re- moved.

  • Page 29: Handlebar Switches

    EBU18068 EBU18102 Start switch “ ” Handlebar switches Push this switch to crank the engine with the start- er. See the starting instructions on page 7-1 prior to starting the engine. EBU18286 Throttle lever 1. Engine stop switch “ ” 2.

  • Page 30: Speed Limiter

    2. To increase the maximum engine power vices. A vehicle speed limiter adjusting screw and available and the maximum speed of the ATV, a removable engine speed limiter plate. Yamaha turn the adjusting screw in direction (a). To recommends that all beginning riders start off with...
  • Page 31 1. Locknut 1. Screw 2. Adjusting screw 2. Engine speed limiter plate 3. No more than 14.5 mm (0.57 in) 3. Tighten the screws. 3. Tighten the locknut. 4. Install the seat. Engine speed limiter plate Store the engine speed limiter plate with the Own- When the engine speed limiter plate is installed, er’s Manual so that it is readily available whenever engine speed is limited to 4900 r/min.

  • Page 32: Front Brake Lever

    EBU18393 EBU18403 Front brake lever Rear brake lever 1. Front brake lever 1. Rear brake lever The front brake lever is located on the right han- The rear brake lever is located on the left handle- dlebar. To apply the front brake, pull the brake le- bar.

  • Page 33: Drive Select Lever

    braking performance which could cause an accident. You could also wear out the brakes prematurely. EBU18583 Drive select lever 1. Parking brake lock plate EWB00221 WARNING  Always set the parking brake before starting the engine. The ATV could start moving un- expectedly if the parking brake is not ap- 1.

  • Page 34: Kickstarter

    EBU33893 Kickstarter Use the kickstarter to start the engine when the battery voltage is low. 1. Remove the seat (page 5-13), and then re- move the kickstarter lever. 1. Kickstarter lever cap 3. Install the kickstarter lever. 4. Move the kickstarter lever down lightly with your foot until the gears engage, and then push it down smoothly but forcefully.

  • Page 35: Fuel Tank Cap

    EBU37980 Fuel tank cap 1. Fold out. 2. Push down. 1. Fuel tank cap 5. When the engine has started, remove the Remove the fuel tank cap by turning it counter- kickstarter lever and store it under the seat. clockwise. 6.

  • Page 36: Fuel

    of sparks, open flames, or other sources of 3. Wipe up any spilled fuel immediately. NOTICE: Immediately wipe off spilled fuel ignition such as the pilot lights of water heat- ers and clothes dryers. with a clean, dry, soft cloth, since fuel may 2.

  • Page 37: Fuel Cock

    About the recommended fuel Recommended fuel: This model’s engine has been designed to use Regular unleaded gasoline (Gasohol [E10] regular unleaded gasoline. The research octane acceptable) number should be 95 or higher. If knocking or Fuel tank capacity: pinging occurs, try a gasoline of a different brand 6.6 L (1.7 US gal, 1.5 Imp.gal) or higher octane.
  • Page 38 1. Arrow mark positioned over “OFF” 1. Arrow mark positioned over “ON” With the fuel cock lever in this position, fuel will not With the fuel cock lever in this position, fuel flows flow. Always turn the fuel cock lever to this posi- to the carburetor.

  • Page 39: Starter (Choke)

    1. Starter (choke) lever 1. Arrow mark positioned over “RES” To use the starter (choke) and enrich the air-fuel This indicates reserve. With the fuel cock lever in ratio, move the starter (choke) lever in direction (a). this position, the fuel reserve is made available. To decrease the starter (choke) or turn it off, move Turn the fuel cock lever to this position if you run the starter (choke) lever in direction (b).

  • Page 40: Seat

    To install the seat EBU34551 Seat To remove the seat 1. Projection 2. Seat holder Insert the projection on the front of the seat into 1. Seat the seat holder, and then push down on the seat 2. Seat lock lever at the rear to lock it in place.
  • Page 41 Adjust the spring preload as follows. Turn the spring preload adjusting ring in direction (a) to increase the spring preload and thereby A special wrench can be obtained at a Yamaha harden the suspension, and in direction (b) to de- dealer to make this adjustment.

  • Page 42: Rear Shock Absorber

    ECB01091 NOTICE Never turn the adjusting mechanism beyond the minimum and maximum settings. Adjust the spring preload as follows. Turn the spring preload adjusting ring in direction (a) to increase the spring preload and thereby harden the suspension, and in direction (b) to de- crease the spring preload and thereby soften the suspension.
  • Page 43 A special wrench can be obtained at a Yamaha dealer to make this adjustment. 1. Special wrench Spring preload setting: Minimum (soft): Standard: Maximum (hard): 5-16...

  • Page 44: Pre-Operation Checks

    Do not operate the vehicle if you find any problem. If a problem cannot be corrected by the procedures provided in this manual, have the vehicle inspected by a Yamaha dealer. Before using this vehicle, check the following points:...
  • Page 45 ITEM ROUTINE PAGE • Make sure that operation is smooth. Lubricate cable and lever Throttle lever housing if necessary. 6-3, 9-20 • Check lever free play, and adjust if necessary. Control cables • Make sure that operation is smooth. Lubricate if necessary. 9-28 •...

  • Page 46: Fuel

    Make sure that the engine oil is at the specified Check the operation of the throttle lever. It must level. Add oil as necessary. (See page 9-10.) open smoothly and spring back to the idle position when released. Have a Yamaha dealer correct if EBU38541 necessary. Transmission...
  • Page 47 Tire pressure Tire pressure gauge Use a tire pressure gauge to check and adjust tire air pressure when the tires are cold. The tire air pressure must equal both sides. WARNING! Operation of this vehicle with im- proper tire pressure may cause severe injury or death from loss of control or rollover.
  • Page 48 After extensive tests, only the tires list- braking, and comfort. Other tires, rims, sizes, and ed below are approved for this model by Yamaha. combinations may not be appropriate. EWB02552...

  • Page 49: Chassis Fasteners

    EBU19841 Chassis fasteners Make sure that all nuts, bolts and screws are properly tightened. EBU33810 Instruments and switches Check that all instruments and switches are work- ing properly. Correct if necessary.

  • Page 50: Operation

    4. Shift the drive select lever into the neutral po- the ATV. If there is a control or function you do not sition. (The neutral indicator light should understand, ask your Yamaha dealer. come on.) EWB00632 5. Position the starter (choke) lever according to WARNING the ambient temperature.
  • Page 51  If the engine fails to start using the start switch, Ambient temp./starter (choke) position try using the kickstarter. (See page 5-7.) 7. If the engine is started with the starter (choke) lever in position (1), move the lever to position (2) to warm up the engine.

  • Page 52: Starting A Warm Engine

    EBU20292 Starting a warm engine Follow the same procedure as for starting a cold engine, with the exception that the starter (choke) is not required when the engine is warm. Instead, start the engine with the throttle slightly open. EBU33831 Operating the drive select lever and driving in reverse ECB00171...

  • Page 53: Engine Break-In

    If the indicator light does not come on, hours of operation. For this reason, you should fol- have a Yamaha dealer check the electrical circuit. low the engine break-in instructions carefully. Since the engine is brand new, do not put an ex- cessive load on it for the first 320 km (200 mi) or 20 hours.

  • Page 54: Parking

    ATV to engine break-in period, immediately have a roll out of control, increasing the chance of an Yamaha dealer check the ATV. accident. If you must park on an incline, place the ATV transversely across the incline, shift...

  • Page 55: Accessories And Loading

    Yamaha manufacture parts or come off while you are riding could affect and accessories or offer other modifications for your ability to control the ATV. Yamaha vehicles. Yamaha is not in a position to test the products that these aftermarket compa-...
  • Page 56  Do not mount an accessory where it could inter- trailer, you must use common sense and good fere with your ability to control the ATV. Exam- judgment as the stability and handling of an ATV ples include (but are not limited to) a heavy or can be changed.
  • Page 57  Allow more braking distance. A heavier ATV takes longer to stop.  Avoid making sharp turns unless at very slow speeds.  Avoid hills and rough terrain. Choose terrain carefully. Added weight affects the stability and handling of the ATV.

  • Page 58: Riding Your Atv

    EBU21142 RIDING YOUR ATV...

  • Page 59: Getting To Know Your Atv

    RIDE WITH CARE AND GOOD JUDGMENT EBU34101 Beginning riders should get training from a GETTING TO KNOW YOUR ATV certified instructor. This ATV is intended for recreational use by young EWB01382 operators under adult supervision. This section, WARNING “Riding your ATV”, provides general riding instruc- ...
  • Page 60 teristics. Take the time to learn the basic techni- This ATV is designed to carry the operator only ques well before attempting more difficult – passengers prohibited. maneuvers. The long seat is to allow the operator to shift posi- tion as needed during operation. It is not for carry- Not recommended for children under 10 years ing passengers.
  • Page 61 Apparel Always wear the following to reduce risk of injury in an accident:  Approved motorcycle helmet that fits properly  Eye protection (goggles, helmet face shield, or protective eyewear)  Over-the-ankle boots, gloves, long-sleeved shirt or jacket, and long pants An approved helmet and other personal protective equipment can reduce the severity of injuries in an accident.
  • Page 62 (See page 5-3.) This model also has an engine speed limiter plate to limit the amount of engine power available. Yamaha recommends that all beginning riders start off with the engine speed limiter plate in- Pre-operation checks stalled and the vehicle speed limiter adjusting...
  • Page 63  Make sure the load does not interfere with adjusting screw back in again and adjust it out in stages as you did before. For engine speed limiter your control or ability to see where you are plate removal instructions, see page 5-4. going.
  • Page 64 All parts and accessories added to this ATV should be genuine Yamaha or equivalent components designed for use on this ATV and should be in- stalled and used according to instructions. If you Avoid wheelies and jumping.
  • Page 65 modifications may cause changes in handling rials may have collected. Do not idle or park the which in some situations could lead to an acci- vehicle in long dry grass or other dry ground cov- dent. [EWB01492] To prevent burns, avoid touching the exhaust sys- Exhaust system tem.

  • Page 66: Be Careful Where You Ride

    BE CAREFUL WHERE YOU RIDE Watch carefully for other vehicles. Make sure you This ATV is designed for use on unpaved surfaces know your country’s laws and regulations before only. WARNING! Paved surfaces may seriously you ride on unpaved public streets or roads. Do affect handling and control of the ATV, and not ride on any paved public street, road or motor- may cause the ATV to go out of control.
  • Page 67 bumps, or holes. Go slowly and be extra care- ful when operating on unfamiliar terrain. Al- ways be alert to changing terrain conditions when operating the ATV. [EWB01532] When riding in an area where you might not easily be seen, such as desert terrain, mount a caution flag on the ATV.
  • Page 68 Select a large, flat, unpaved area to become famil- iar with your ATV. Make sure that this area is free of obstacles and other riders. You should practice Do not ride in areas posted “no trespassing”. control of the throttle, brakes, and turning techni- Do not ride on private property without getting ques in this area before trying more difficult ter- permission.

  • Page 69: Turning Your Atv

    abruptly, the vehicle may lurch forward or the front nique must be used to allow the ATV to make wheels may lift off the ground, resulting in a loss of turns quickly and easily. It is essential that this skill directional control.

  • Page 70: Climbing Uphill

    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 throt- tle changes, excessive braking, incorrect body movements, or too much speed for the sharpness of the turn may cause the ATV to tip.
  • Page 71  Shift your weight forward.  Never open the throttle suddenly. The ATV could flip over backwards.  Never go over the top of any hill at high speed. An obstacle, a sharp drop, or another vehicle or person could be on the other side of the hill.
  • Page 72 on steeper inclines, standing on the footboards and leaning forward over the handlebars. When- ever possible, ride straight up hills. Slow down when you reach the crest of the hill if you cannot see clearly what is on the other side – there could be another person, an obstacle, or a sharp drop-off.

  • Page 73: Riding Downhill

    ATV on the uphill side or to the left-hand side RIDING DOWNHILL when the ATV is pointed straight uphill. If possible, EWB01132 WARNING get help to turn the ATV around and then remount it when safe and ride downhill carefully as ex- Going down a hill improperly could cause over- plained in the following section.

  • Page 74: Crossing A Slope

    When riding your ATV downhill, shift your weight as far to the rear and uphill side of the ATV as pos- sible. Move back on the seat and sit with your arms straight. Engine compression will do most of the braking for you. Use caution while descending a hill with loose or slippery surfaces.

  • Page 75: Crossing Through Shallow Water

     Never attempt to turn the ATV around on any hill until you have mastered the turning tech- nique as described in the Owner’s Manual on level ground. Be very careful when turning on any hill. Traversing a sloping surface on your ATV requires you to properly position your weight to maintain proper balance.
  • Page 76 The ATV can be used to cross slow moving, shal- braking ability. WARNING! Wet brakes may have low water of up to a maximum of 20 cm (8 in) in reduced stopping ability, which could cause depth. Before entering the water, choose your loss of control.

  • Page 77: Riding Over Rough Terrain

    accident. Be sure to keep your feet firmly mounted on the footboards at all times. Avoid jumping the ATV as loss of control and damage to the ATV may result. SLIDING AND SKIDDING EWB01663 WARNING Skidding or sliding improperly may cause you to lose control of this ATV.

  • Page 78: What To Do If

    To reduce the tendency for the front wheels to slide in loose or slippery conditions, positioning your weight over the front wheels will sometimes help. With practice, over a period of time, skill at con- trolled sliding can be developed. The terrain should be chosen carefully before attempting such maneuvers, since both stability and control If the rear wheels of your ATV start to slide side-...
  • Page 79  If your ATV is traversing a sloping surface: WHAT TO DO...  If your ATV doesn’t turn when you want it to: Be sure to ride with your weight positioned to- Bring the ATV to a stop and practice the turning wards the uphill side of the ATV to maintain maneuvers again.

  • Page 80: Periodic Maintenance And Adjustment

    The intervals given in the periodic maintenance vice or while using the vehicle. If you are not fa- charts should be considered as a general guide miliar with vehicle service, have a Yamaha under normal riding conditions. However, DE- dealer perform the service.

  • Page 81: Owner's Manual And Tool Kit

     If you do not have the tools or experience re- EBU33902 Owner’s Manual and tool kit quired for a particular job, have a Yamaha deal- Place the Owner’s Manual in a plastic bag, and er perform it for you.

  • Page 82: Periodic Maintenance Chart: Emission Control System

     For odometer or hour meter-equipped vehicles, follow the month maintenance interval if the ATV isn’t ridden for the stated mileage or engine operating hours.  Items marked with an asterisk should be performed by a Yamaha dealer as they require special tools, data and technical skills.
  • Page 83 INITIAL EVERY month Whichev- CHECK OR MAINTENANCE ITEM er comes 1300 2500 2500 5000 km (mi) first (200) (800) (1600) (1600) (3200) hours • Check for leakage and replace gasket(s) if neces- sary. √ √ √ Exhaust system • Check for looseness and tighten all screw clamps and joints if necessary.

  • Page 84: Periodic Maintenance Chart: General Maintenance And Lubrication

     For odometer or hour meter-equipped vehicles, follow the month maintenance interval if the ATV isn’t ridden for the stated mileage or engine operating hours.  Items marked with an asterisk should be performed by a Yamaha dealer as they require special tools, data and technical skills.
  • Page 85 INITIAL EVERY month Whichev- CHECK OR MAINTENANCE ITEM er comes 1300 2500 2500 5000 km (mi) first (200) (800) (1600) (1600) (3200) hours • Check runout and for damage, and replace if nec- √ √ √ √ Wheels essary. • Check tread depth and for damage, and replace if necessary.
  • Page 86 INITIAL EVERY month Whichev- CHECK OR MAINTENANCE ITEM er comes 1300 2500 2500 5000 km (mi) first (200) (800) (1600) (1600) (3200) hours √ √ √ Steering shaft • Lubricate with lithium-soap-based grease. • Check operation and repair or replace if dam- √...
  • Page 87 EBU23062 Some maintenance items need more frequent service if you are riding in unusually wet, dusty, sandy or muddy areas, or at full-throttle.

  • Page 88: Checking The Spark Plug

    If the spark plug shows a distinctly different color, the engine could be operating improperly. Do not attempt to diagnose such problems yourself. In- stead, have a Yamaha dealer check the ATV. 1. Spark plug cap 2. Remove the spark plug as shown, with the...

  • Page 89: Engine Oil

    2. Check the spark plug for electrode erosion To install the spark plug and excessive carbon or other deposits, and 1. Clean the surface of the spark plug gasket replace it if necessary. and its mating surface, and then wipe off any grime from the spark plug threads.
  • Page 90 To check the engine oil level 1. Park the ATV on a level surface. 2. Wait for the engine to cool. If the engine was started before checking the oil level, wait 10 minutes. This will allow oil to settle into the crankcase for an accurate reading.
  • Page 91 2. Start the engine, warm it up for several minu- 5. Clean the oil strainer with solvent. tes, and then turn it off. 6. Discard the old engine oil drain bolt O-ring, 3. Place an oil pan under the engine to collect and then apply a thin coat of clean engine oil the used oil.

  • Page 92: Why Yamalube

    EBU38620 Why Yamalube Be sure to wipe off spilled oil on any parts after the YAMALUBE oil is a Genuine YAMAHA Part born of engine and exhaust system have cooled down. the engineers’ passion and belief that engine oil is an important liquid engine component.

  • Page 93: Transmission Oil

    The transmission case must be checked for oil leakage before each ride. If any leakage is found, have a Yamaha dealer check and repair the ATV. In addition, the transmission oil must be changed at the intervals specified in the periodic mainte- nance chart.

  • Page 94: Cleaning The Air Filter Element

    Recommended oil: See page 11-1. Oil quantity: 0.35 L (0.37 US qt, 0.31 Imp.qt) 7. Check the oil filler cap O-ring for damage, and replace it if necessary. 8. Install and tighten the oil filler cap. 9. Check the transmission case for oil leakage. If oil is leaking, check for the cause.
  • Page 95 1. Air filter case check hose 1. Air filter case cover 2. Air filter case cover holder 1. Park the ATV on a level surface. 4. Remove the air filter element, and clean it with 2. Remove the seat. (See page 5-13.) solvent.
  • Page 96 5. Squeeze the excess solvent out of the air filter element and let it dry. NOTICE: Do not twist 7. Apply Yamaha foam air filter oil or other qual- ity foam air filter oil to the element. the air filter element when squeezing it.

  • Page 97: Cleaning The Spark Arrester

    ment removed. This will allow unfiltered air dusty areas. When servicing the air filter element, to enter the engine, causing rapid engine be sure to check the air inlet of the air filter case wear and possible engine damage. Addi- for obstructions.

  • Page 98: Adjusting The Carburetor

    The carburetor is an important part of the engine and requires very so- The engine is warm when it quickly responds to phisticated adjustment. Therefore, most carbure- the throttle. tor adjustments should be left to a Yamaha dealer, 9-19...

  • Page 99: Adjusting The Throttle Lever Free Play

    3. Check the engine idling speed and, if neces- If the specified idling speed cannot be obtained as sary, adjust it to specification by turning the described above, have a Yamaha dealer make the throttle stop screw at the carburetor. To in- adjustment.

  • Page 100: Valve Clearance

    Yamaha dealer at the inter- vals specified in the periodic maintenance chart. Front brakes To check front brake shoe wear, check the posi- tion of the adjusting bolts.
  • Page 101 1. Upper adjusting bolt 1. Rear brake lever free play adjusting nut 2. Lower adjusting bolt 2. Bolt 3. No more than 12 mm (0.47 in) 3. No more than 18 mm (0.71 in) Rear brake To check rear brake shoe wear, check the position of the adjusting nut.

  • Page 102: Adjusting The Front Brake Lever Free Play

    EBU24334 Adjusting the front brake lever free play 1. Upper locknut 2. Upper adjusting bolt 3. Lower locknut 4. Lower adjusting bolt 1. Front brake lever free play 4. Tighten the lower locknut. Front brake lever free play: 5. While applying the front brake, turn out the 20.0–25.0 mm (0.79–0.98 in) upper adjusting bolt until the upper and lower cable lengths are equal.

  • Page 103: Adjusting The Rear Brake Lever Free Play

    EBU33784 Adjusting the rear brake lever free play a=a´ a´ 1. Cable joint 6. Tighten the upper locknut. 1. Rear brake lever free play Rear brake lever free play: After adjusting the brake lever free play, check the 30.0–40.0 mm (1.18–1.57 in) front brake shoes for wear.

  • Page 104: Drive Chain Slack

    To check the drive chain slack 1. Place the ATV on a level surface. 2. Move the ATV back and forth to locate the tightest portion of the drive chain, and then measure the drive chain slack as shown. Drive chain slack: 24.0–32.0 mm (0.94–1.26 in) 1.
  • Page 105 1. Bolt 1. Rear brake lever free play adjusting nut 3. Loosen the locknut. 1. Nut 1. Drive chain slack adjusting nut 2. Loosen the rear brake lever free play adjust- 2. Locknut ing nut. 9-26...

  • Page 106: Lubricating The Drive Chain

    4. To tighten the drive chain, turn the drive chain EBU24885 Lubricating the drive chain slack adjusting nut in direction (a). To loosen the drive chain, turn the adjusting nut in direc- tion (b) and push the rear wheels forward. NOTICE: Improper drive chain slack will overload the engine as well as other vital parts of the ATV and can lead to drive...

  • Page 107: Checking And Lubricating The Cables

    If a cable is damaged or does not move The operation of the front and rear brake levers smoothly, have a Yamaha dealer check or replace should be checked before each ride, and the lever pivots should be lubricated if necessary.

  • Page 108: Checking The Wheel Hub Bearings

    If there is play in a wheel hub or if a wheel does not turn smoothly, have a Yamaha dealer check the wheel hub bearings. Rear brake lever EBU36392 Lubricating the front arm pivots...

  • Page 109: Lubricating The Front Knuckle Pivots

    Lubricating the steering shaft The front knuckle pivots must be lubricated at the The steering shaft must be lubricated by a intervals specified in the periodic maintenance Yamaha dealer at the intervals specified in the pe- chart. riodic maintenance chart. Recommended lubricant:...

  • Page 110: Battery

    Wash KEEP OUT OF REACH OF CHILDREN. hands after handling.  It is recommended to have the battery serviced by a Yamaha dealer. To remove the battery 1. Remove the seat. (See page 5-13.) 2. Unhook the battery band.
  • Page 111 ECB00622 NOTICE Never attempt to open the battery or remove the battery cell seals, as this would permanent- ly damage the battery. To charge the battery  Confirm the recommended charging rate as specified on the battery itself.  Select a suitable charger and follow the manu- facturer’s instructions.
  • Page 112 ECB00942 NOTICE  Always keep the battery charged. Storing the battery in a discharged state for an extended period of time will cause permanent battery damage.  Do not store the battery in an excessively cold or warm place [below freezing or above 30 °C (90 °F)].

  • Page 113: Replacing The Fuse

    5. Install the seat. 1. Fuse 6. If the fuse immediately blows again, have a 2. Spare fuse Yamaha dealer check the vehicle. If an electrical problem is suspected, check the fuse and replace it if necessary as follows. EBU34030...

  • Page 114: Installing A Wheel

    1. Wheel bolt 1. Arrow mark 2. Forward rotating direction 3. Elevate the ATV and place a suitable stand 3. Wheel bolt under the frame. 2. Lower the ATV to the ground. 4. Remove the bolts from the wheel. 3. Tighten the wheel bolts to the specified 5.

  • Page 115: Troubleshooting

    However, should your ATV re- quire any repair, take it to a Yamaha dealer, whose skilled technicians have the necessary tools, ex- perience, and know-how to service the ATV prop- erly.

  • Page 116: Troubleshooting Chart

    Have a Yamaha dealer check the ATV. Check the compression. 4. Compression There is compression. The engine does not start. Have a Yamaha dealer check the ATV. Operate the electric starter. Have a Yamaha dealer check the ATV. There is no compression.

  • Page 117: Cleaning And Storage

    EBU25861 CLEANING AND STORAGE ter pressure may cause water seepage EBU25903 Cleaning and deterioration of wheel bearings, Frequent, thorough cleaning of your ATV will not brakes, transmission seals and electrical only enhance its appearance but will improve its devices. Many expensive repair bills have general performance and extend the useful life of resulted from improper high-pressure de- many components.

  • Page 118: Storage

    abrasives which may mar the paint or protec- 3. Fill up the fuel tank and add fuel stabilizer (Fu- tive finish. When finished cleaning, start the el Med Rx if available), and then run the en- engine and let it idle for several minutes. gine for 5 minutes to distribute the treated fuel.
  • Page 119 e. Install the spark plug and the spark plug cap. 6. Lubricate all control cables and the pivoting points of all levers. 7. Put the frame on stands or blocks to raise all wheels off the ground. (Alternatively, turn the wheels each month to prevent the tires from degrading in one spot.) 8.

  • Page 120: Specifications

    EBU25964 SPECIFICATIONS Dimensions: Uncertainty of measurement: 0.4 dB(A) Overall length: Vibration on seat (EN1032, ISO5008): 1485 mm (58.5 in) 1.5 m/s² Overall width: Uncertainty of measurement: 1020 mm (40.2 in) 0.3 m/s² Overall height: Vibration on handle (EN1032, ISO5008): 955 mm (37.6 in) 5.2 m/s²...
  • Page 121 Engine oil: Air filter: Recommended brand: Air filter element: Wet element Air filter oil grade: Foam air-filter oil Fuel: Recommended fuel: SAE viscosity grades: Regular unleaded gasoline (Gasohol [E10] acceptable) 5W-30, 10W-30, 10W-40, 15W-40, 20W-40, 20W-50 Minimum research octane: Recommended engine oil grade: API service SG type or higher, JASO standard MA Fuel tank capacity: 130 ˚F...
  • Page 122 Transmission type: Front wheel: CVT automatic with reverse Rim size: Gear ratio: 8 x 5.5AT Transmission ratio: Rear wheel: 2.570–0.851 : 1 Rim size: Forward gear: 8 x 5.5AT 8.292 (49/15 x 33/13) Front brake: Reverse gear: Type: 25.395 (49/15 x 49/16 x 33/13) Mechanical leading, trailing drum brake Front tire: Rear brake:...
  • Page 123 Electrical system: Factors that influence the actual level of exposure System voltage: of work-force include the characteristics of the 12 V work room, the other sources of noise, etc. i.e. the Ignition system: number of machines and other adjacent process- es, and the length of time for which an operator is Charging system: exposed to the noise.

  • Page 124: Index

    INDEX Engine stop switch ............5-2 Accessories and loading ..........7-6 Air filter element, cleaning ..........9-15 Front and rear brake shoes, checking ......9-21 Front arm pivots, lubricating ........9-29 Front knuckle pivots, lubricating ........9-30 Battery ................9-31 Fuel ................ 5-9, 6-3 Brake lever free play, adjusting the front .....9-23 Fuel cock ..............
  • Page 125 Vehicle identification number ........1-1 Parking ................7-5 Parking brake ..............5-5 Wheel hub bearings, checking ........9-29 Parking on a slope ............7-5 Wheel, installing ............9-35 Part locations ..............4-1 Wheel, removing ............9-34 Reverse indicator light ........... 5-1 Yamalube ..............
  • Page 126 EBU33962 WARNING Improper ATV use can result in SEVERE INJURY or DEATH. ALWAYS USE NEVER CARRY NEVER USE NEVER USE WITH DRUGS AN APPROVED ON PAVED PASSENGERS OR ALCOHOL HELMET AND ROADS PROTECTIVE GEAR NEVER ALWAYS operate: • without proper training or instruction. •...

This manual is also suitable for:

Yj-50 2021

Table of Contents