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EAU10100 Welcome to the Yamaha world of motorcycling! As the owner of the YBR125ED, you are benefiting from Yamaha’s vast experience and newest technology regarding the design and manufacture of high-quality products, which have earned Yamaha a reputation for dependability.
This manual should be considered a permanent part of this motorcycle and should remain with it even if the motorcycle is subsequently sold. Yamaha continually seeks advancements in product design and quality. Therefore, while this manual contains the most current product information available at the time of printing, there may be minor discrepancies between your motorcycle and this manual.
TABLE OF CONTENTS SAFETY INFORMATION ....1-1 PRE-OPERATION CHECKS ..... 4-1 Adjusting the clutch lever Pre-operation check list ....4-2 free play ........6-16 DESCRIPTION ........2-1 Checking the front brake lever Left view ..........2-1 OPERATION AND free play ........6-17 Right view ........2-2 IMPORTANT RIDING POINTS ..
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TABLE OF CONTENTS Battery ..........6-27 Replacing the fuse ......6-29 Replacing the headlight bulb ..6-30 Replacing the tail/ brake light bulb ......6-32 Replacing a turn signal light bulb ........6-32 Replacing the auxiliary light bulb ........6-33 Front wheel ........6-33 Rear wheel ........6-35 Troubleshooting ......6-37 Troubleshooting chart ....6-38 MOTORCYCLE CARE AND...
SAFETY INFORMATION EAU10251 AND/OR WHEN MADE NECES- • Ride where other motorists can SARY BY MECHANICAL CONDI- see you. Avoid riding in another MOTORCYCLES SINGLE TIONS. motorist’s blind spot. TRACK VEHICLES. THEIR SAFE USE Many motorcycle accidents in- AND OPERATION ARE DEPENDENT Safe riding volve inexperienced operators.
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Modifications made to this motorcycle other motorists can see you. the single most critical factor in the pre- not approved by Yamaha, or the re- The posture of the operator and vention or reduction of head injuries. moval of original equipment, may ren- passenger is important for proper Always wear an approved helmet.
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Maximum load: been specifically designed for use on create instability due to improper 198 kg (437 lb) this motorcycle. Since Yamaha cannot weight distribution or aerody- test all other accessories that may be namic changes. If accessories When loading within this weight limit,...
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SAFETY INFORMATION tor and may limit control ability, Always turn the engine off before eyes, see your doctor immediately. therefore, such accessories are leaving the motorcycle unattended If any gasoline spills on your skin not recommended. and remove the key from the main or clothing, immediately wash the Use caution when adding electri- switch.
INSTRUMENT AND CONTROL FUNCTIONS EAU10460 EAU10660 To unlock the steering Main switch/steering lock All electrical systems are off. The key can be removed. EAU43140 LOCK The steering is locked, and all electrical systems are off. The key can be re- moved.
INSTRUMENT AND CONTROL FUNCTIONS EAU10980 EAU11080 EAU11630 Indicator lights High beam indicator light “ ” Speedometer unit This indicator light comes on when the high beam of the headlight is switched 1. Left turn signal indicator light “ ” 1. Speedometer 2.
INSTRUMENT AND CONTROL FUNCTIONS EAU11851 EAU37051 EAU12347 Tachometer Fuel gauge Handlebar switches Left 1. Tachometer 1. Fuel gauge 2. Tachometer red zone 2. Red zone 1. Dimmer switch “ ” 2. Turn signal switch “ ” The electric tachometer allows the rider The fuel gauge indicates the amount of 3.
INSTRUMENT AND CONTROL FUNCTIONS EAU12400 EAU12820 EAU12870 Dimmer switch “ ” Clutch lever Shift pedal Set this switch to “ ” for the high beam and to “ ” for the low beam. EAU12460 Turn signal switch “ ” To signal a right-hand turn, push this switch to “...
INSTRUMENT AND CONTROL FUNCTIONS EAU12890 EAU12941 EAU13001 Brake lever Brake pedal Fuel tank cap 1. Brake lever 1. Brake pedal 1. Unlock. The brake lever is located at the right The brake pedal is on the right side of To remove the fuel tank cap handlebar grip.
Avoid spilling fuel on the hot en- Your Yamaha engine has been de- gine. signed to use regular unleaded gaso- line with a research octane number of 91 or higher.
INSTRUMENT AND CONTROL FUNCTIONS or premium unleaded fuel. Use of un- EAU13431 EAU37210 Catalytic converter Fuel cock leaded fuel will extend spark plug life This model is equipped with a catalytic The fuel cock supplies fuel from the and reduce maintenance costs. converter in the exhaust system.
INSTRUMENT AND CONTROL FUNCTIONS “ON” or “ ” This indicates reserve. If you run out of EAU13590 Starter (choke) lever “ ” fuel while riding, move the lever to this position. Fill the tank at the first oppor- tunity. Be sure to set the lever back to “ON”...
INSTRUMENT AND CONTROL FUNCTIONS EAU43150 EAU14880 EWA10210 Kickstarter Adjusting the shock absorber WARNING assemblies Always adjust both shock absorber assemblies equally, otherwise poor handling and loss of stability may result. Adjust the spring preload as follows. To increase the spring preload and thereby harden the suspension, turn the adjusting ring on each shock ab- sorber assembly in direction (a).
Yamaha’s ignition circuit cut-off system has been designed to assist the operator in fulfilling the respon- sibility of raising the sidestand be- fore starting off. Therefore, check...
INSTRUMENT AND CONTROL FUNCTIONS below and have a Yamaha dealer re- EAU43160 Ignition circuit cut-off system pair it if it does not function proper- The ignition circuit cut-off system (com- prising the sidestand switch, clutch switch and neutral switch) has the fol- lowing functions.
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4. Push the start switch or push the kickstarter lever down. Does the engine start? The neutral switch may be defective. The motorcycle should not be ridden until checked by a Yamaha dealer. With the engine still running: 5. Move the sidestand up. 6. Keep the clutch lever pulled.
PRE-OPERATION CHECKS EAU15592 The condition of a vehicle is the owner’s responsibility. Vital components can start to deteriorate quickly and unexpectedly, even if the vehicle remains unused (for example, as a result of exposure to the elements). Any damage, fluid leakage or loss of tire air pressure could have serious consequences.
• Make sure that operation is smooth. • Check cable free play. Throttle grip 6-13, 6-23 • If necessary, have Yamaha dealer adjust cable free play and lubricate cable and grip housing. • Make sure that operation is smooth. Control cables 6-23 •...
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• Correct if necessary. • Check operation of ignition circuit cut-off system. Sidestand switch 3-10 • If system is defective, have Yamaha dealer check vehicle. • Check fluid level. Battery 6-27 • Fill with distilled water if necessary.
Become thoroughly familiar following conditions must be met: Yamaha dealer check the electrical cir- The transmission is in the neutral with all operating controls and cuit. position. their functions before riding.
OPERATION AND IMPORTANT RIDING POINTS ECA11040 EAU16640 EAU16671 Starting a warm engine Shifting CAUTION: Follow the same procedure as for start- For maximum engine life, never ac- ing a cold engine with the exception celerate hard when the engine is that the starter (choke) is not required cold! when the engine is warm.
OPERATION AND IMPORTANT RIDING POINTS ECA10260 EAU16800 EAU16830 Tips for reducing fuel con- Engine break-in CAUTION: sumption There is never a more important period Even with the transmission in in the life of your engine than the period Fuel consumption depends largely on the neutral position, do not between 0 and 1000 km (600 mi).
Never park in an area where there If any engine trouble should oc- are fire hazards such as grass or cur during the engine break-in other flammable materials. period, immediately have a Yamaha dealer check the vehi- cle.
If you are not familiar with mainte- certain maintenance work correctly. nance work, have a Yamaha dealer do it for you. NOTE: If you do not have the tools or experi- ence required for a particular job, have a Yamaha dealer perform it for you.
The annual checks must be performed every year, except if a kilometer-based maintenance is performed in- stead. From 30000 km, repeat the maintenance intervals starting from 6000 km. Items marked with an asterisk should be performed by a Yamaha dealer as they require special tools, data and technical skills. ODOMETER READING (× 1000 km)
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PERIODIC MAINTENANCE AND MINOR REPAIR ODOMETER READING (× 1000 km) ANNUAL ITEM CHECK OR MAINTENANCE JOB CHECK √ √ √ √ √ √ • Check operation and adjust brake pedal free play. 9 * Rear brake • Replace brake shoes. Whenever worn to the limit √...
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PERIODIC MAINTENANCE AND MINOR REPAIR ODOMETER READING (× 1000 km) ANNUAL ITEM CHECK OR MAINTENANCE JOB CHECK √ √ √ √ √ √ 21 * Sidestand switch • Check operation. √ √ √ √ 22 * Front fork • Check operation and for oil leakage. Shock absorber assem- √...
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PERIODIC MAINTENANCE AND MINOR REPAIR • Every two years replace the internal components of the brake master cylinder and caliper, and change the brake fluid. • Replace the brake hoses every four years and if cracked or damaged.
PERIODIC MAINTENANCE AND MINOR REPAIR EAU18771 2. Pull the front of the panel out, and Removing and installing pan- then slide the panel forward to re- lease it in the rear. The panels shown need to be removed to perform some of the maintenance jobs described in this chapter.
PERIODIC MAINTENANCE AND MINOR REPAIR EAU36961 EAU19603 Panel B Checking the spark plug The spark plug is an important engine To remove the panel component, which is easy to check. 1. Slide the panel lock cover open, in- Since heat and deposits will cause any sert the key into the lock, and then spark plug to slowly erode, the spark turn it 1/4 turn clockwise.
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4. Install the spark plug cap. ferent color, the engine could be oper- ating improperly. Do not attempt to diagnose such problems yourself. In- 1. Spark plug gap stead, have a Yamaha dealer check the vehicle. Spark plug gap: 0.6–0.7 mm (0.024–0.028 in)
PERIODIC MAINTENANCE AND MINOR REPAIR EAU37170 4. If the engine oil is at or below the Engine oil minimum level mark, add sufficient The engine oil level should be checked oil of the recommended type to before each ride. In addition, the oil raise it to the correct level.
PERIODIC MAINTENANCE AND MINOR REPAIR 4. Install the engine oil drain bolt, and Make sure that no foreign mate- EAU37121 Cleaning the air filter element then tighten it to the specified rial enters the crankcase. The air filter element should be cleaned torque.
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PERIODIC MAINTENANCE AND MINOR REPAIR EWA10430 WARNING Use only a dedicated parts cleaning solvent. To avoid the risk of fire or explosion, do not use gasoline or solvents with a low flash point. ECA15100 CAUTION: To avoid damaging the sponge ma- 1.
The throttle cable free play should mea- obtained as described above, have a sure 3.0–7.0 mm (0.12–0.28 in) at the Yamaha dealer make the adjustment. throttle grip. Periodically check the throttle cable free play and, if neces- sary, adjust it as follows.
175 kPa (25 psi) (1.75 kgf/cm²) Rear: from occurring, the valve clearance regarding the specified tires. 200 kPa (29 psi) (2.00 kgf/cm²) must be adjusted by a Yamaha dealer 90–198 kg (198–437 lb): at the intervals specified in the periodic Tire air pressure Front: maintenance and lubrication chart.
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Front tire: glass fragments in it, or if the sidewall is Size: cracked, have a Yamaha dealer re- 2.75-18 42P place the tire immediately. Manufacturer/model: CHENG SHIN/C-910...
If any damage is The replacement of all wheel found, have a Yamaha dealer re- and brake related parts, includ- place the wheel. Do not attempt ing the tires, should be left to a...
1. Brake lever free play The brake lever free play should mea- sure 0.0–7.0 mm (0.00–0.28 in) as shown. Periodically check the brake le- ver free play and, if necessary, have a Yamaha dealer check the brake sys- tem. EWA10640 WARNING 1. Locknut (crankcase) An incorrect brake lever free play in- 2.
PERIODIC MAINTENANCE AND MINOR REPAIR EAU39811 EAU22291 Adjusting the brake pedal free Adjusting the rear brake light play switch 1. Brake pedal free play adjusting nut 1. Brake pedal free play 1. Rear brake light switch 2. Rear brake light switch adjusting nut The brake pedal free play should mea- The rear brake light switch, which is ac- sure 20.0–30.0 mm (0.79–1.18 in) at...
To check the brake pad wear, check point that the wear indicator reaches the wear indicator grooves. If a brake the wear limit mark, have a Yamaha pad has worn to the point that the wear dealer replace the brake shoes as a set.
However, if the leakage and poor braking perfor- brake fluid level goes down sud- mance. denly, have a Yamaha dealer check the cause. Recommended brake fluid: DOT 4 1. Minimum level mark NOTE:...
Drive chain slack: Changing the brake fluid Drive chain slack 20.0–30.0 mm (0.79–1.18 in) Have a Yamaha dealer change the The drive chain slack should be brake fluid at the intervals specified in checked before each ride and adjusted 5. If the drive chain slack is incorrect, the NOTE after the periodic mainte- if necessary.
PERIODIC MAINTENANCE AND MINOR REPAIR 3. To tighten the drive chain, turn the ECA10570 EAU23022 Cleaning and lubricating the CAUTION: adjusting bolt at each end of the drive chain swingarm in direction (a). To loos- Improper drive chain slack will over- The drive chain must be cleaned and en the drive chain, turn the adjust- load the engine as well as other vital...
If a cable is damaged maintenance chart. or does not move smoothly, have a Yamaha dealer check or replace it. Recommended lubricant: Engine oil EWA10720 WARNING...
PERIODIC MAINTENANCE AND MINOR REPAIR EAU23131 EAU23140 Recommended lubricant: Checking and lubricating the Checking and lubricating the Lithium-soap-based grease (all-pur- brake and shift pedals brake and clutch levers pose grease) Brake lever Clutch lever The operation of the brake and shift pedals should be checked before each The operation of the brake and clutch ride, and the pedal pivots should be lu-...
EWA10740 WARNING If the centerstand or sidestand does not move up and down smoothly, have a Yamaha dealer check or re- pair it. Recommended lubricant: Lithium-soap-based grease (all-pur- pose grease) 6-25...
Securely support the vehicle so that fork does not operate smoothly, damage and excessive oil leakage. there is no danger of it falling over. have a Yamaha dealer check or re- pair it. To check the operation 2. Hold the lower ends of the front 1.
Yamaha dealer check tervals specified in the periodic mainte- the wheel bearings. nance and lubrication chart.
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PERIODIC MAINTENANCE AND MINOR REPAIR working near batteries. In case ECA10610 CAUTION: of contact, administer the fol- lowing FIRST AID. Use only distilled water, as tap water • EXTERNAL: Flush with plenty contains minerals that are harmful of water. to the battery. •...
PERIODIC MAINTENANCE AND MINOR REPAIR that the breather hose is properly EAU43211 Replacing the fuse routed, in good condition, and not The fuse is located behind panel B. obstructed. (See page 6-6.) ECA10600 To access the fuse, remove the starter CAUTION: relay coupler.
3. Turn the key to “ON” and turn on the electrical circuits to check if the devices operate. 4. If the fuse immediately blows again, have a Yamaha dealer check the electrical system. 1. Spare fuse 1. Screw If the fuse is blown, replace it as fol- 2.
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8. Install the headlight unit by install- ing the screws. wise until it stops. 9. Have a Yamaha dealer adjust the ECA10660 CAUTION: headlight beam if necessary. 1. Headlight bulb socket...
PERIODIC MAINTENANCE AND MINOR REPAIR EAU24131 EAU24202 Replacing the tail/brake light Replacing a turn signal light bulb bulb 1. Remove the tail/brake light lens by 1. Remove the turn signal light lens removing the screws. by removing the screw. 1. Tail/brake light bulb 3.
EWA10820 1. Remove the headlight unit by re- WARNING moving the screws. It is advisable to have a Yamaha dealer service the wheel. Securely support the motor- cycle so that there is no danger 1. Auxiliary light bulb socket of it falling over.
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PERIODIC MAINTENANCE AND MINOR REPAIR 3. Remove the rubber caps from the ends of the wheel axle by pulling them off. 1. Rubber cap 1. Speedometer gear unit 2. Wheel axle 2. Lift the wheel up between the fork 3. Washer legs.
To remove the rear wheel smoothly. EWA10820 WARNING 7. Connect the speedometer cable. It is advisable to have a Yamaha dealer service the wheel. Securely support the motor- cycle so that there is no danger 1. Speedometer gear unit retainer of it falling over.
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PERIODIC MAINTENANCE AND MINOR REPAIR 6. Remove the axle nut, and then pull the wheel axle out. 7. Push the wheel forward, and then remove the drive chain from the rear sprocket. NOTE: The drive chain does not need to be disassembled in order to remove and install the wheel.
However, should your motorcycle 9. Insert a new cotter pin. require any repair, take it to a Yamaha 10. Adjust the brake pedal free play. dealer, whose skilled technicians have (See page 6-18.)
Remove the spark plug and check the electrodes. The engine does not start. Have a Yamaha dealer check the vehicle. Check the battery. 4. Battery The engine turns over The battery is good.
Rust and corrosion can develop matte colored finished parts. Be Cleaning even if high-quality components are sure to consult a Yamaha dealer for ECA10771 advice on what products to use be- used. A rusty exhaust pipe may go un- CAUTION: fore cleaning the vehicle.
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MOTORCYCLE CARE AND STORAGE contact with strong or abrasive scratched, use a quality plastic 1. Clean the motorcycle with cold wa- cleaning products, solvent or polishing compound after ter and a mild detergent, after the thinner, fuel (gasoline), rust re- washing.
WARNING NOTE: To prevent corrosion, avoid Make sure that there is no oil or Consult a Yamaha dealer for advice on damp cellars, stables (because what products to use. wax on the brakes or tires. of the presence of ammonia)
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MOTORCYCLE CARE AND STORAGE 3. Drain the carburetor float chamber EWA10950 °C (90 °F)]. For more information WARNING by loosening the drain bolt; this will on storing the battery, see page prevent fuel deposits from building To prevent damage or injury from 6-27.
Record the key identification number, vehicle identification number and mod- el label information in the spaces pro- vided below for assistance when ordering spare parts from a Yamaha dealer or for reference in case the vehi- cle is stolen. KEY IDENTIFICATION NUMBER: 1.
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1. Model label The model label is affixed to the frame behind panel B. (See page 6-6.) Record the information on this label in the space provided. This information will be needed when ordering spare parts from a Yamaha dealer.
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INDEX Periodic maintenance and lubrication chart ........6-2 Air filter element, cleaning ....6-10 Front brake lever free play, checking ..6-17 Pre-operation check list ......4-2 Auxiliary light bulb, replacing ....6-33 Front fork, checking.......6-26 Fuel ............3-6 Fuel cock..........3-7 Rear brake light switch, adjusting ..6-18 Battery ..........
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