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Read this manual carefully before operating this vehicle. OWNER’S MANUAL YS125-5C BT4-F8199-E0...
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EAU46094 Read this manual carefully before operating this vehicle. This manual should stay with this vehicle if it is sold.
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EAU10103 Welcome to the Yamaha world of motorcycling! As the owner of the YS125-5C, 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.
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Important manual information EAU10134 Particularly important information is distinguished in this manual by the following notations: This is the safety alert symbol. It is used to alert you to potential personal injury hazards. Obey all safety messages that follow this symbol to avoid possible injury or death.
Table of contents Safety information......1-1 For your safety – pre-operation Cast wheels ........6-19 checks ..........4-1 Adjusting the clutch lever free Description ........2-1 play..........6-19 Left view ......... 2-1 Operation and important riding Checking the brake lever free Right view........
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Table of contents Replacing the fuse......6-31 Replacing the headlight bulb..6-33 Replacing the auxiliary light bulb ...........6-34 Replacing the brake/tail light bulb ..........6-35 Replacing a turn signal light bulb ..........6-35 Replacing the license plate light bulb ..........6-36 Front wheel........6-36 Rear wheel........6-37 Troubleshooting ......6-39 Troubleshooting chart ....6-41 Motorcycle care and storage ..7-1...
Safety information Never operate a motorcycle with- pears to be very effective in reduc- EAU1028B out proper training or instruction. ing the chance of this type of Take a training course. Beginners accident. Be a Responsible Owner should receive training from a cer- Therefore: As the vehicle’s owner, you are re- tified instructor.
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Safety information Many accidents involve inexperi- • Always signal before turning or Protective Apparel enced operators. In fact, many op- changing lanes. Make sure that The majority of fatalities from motorcy- erators who have been involved in other motorists can see you. cle accidents are the result of head in- ...
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Safety information Do not run engine outdoors where Avoid Carbon Monoxide Poisoning When loading within this weight limit, All engine exhaust contains carbon engine exhaust can be drawn into keep the following in mind: Cargo and accessory weight monoxide, a deadly gas.
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Yamaha accessories, which are avail- performed to your vehicle that change lightweight as possible and able only from a Yamaha dealer, have any of the vehicle’s design or operation should be kept to a minimum. been designed, tested, and approved characteristics can put you and others •...
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Safety information Check that the fuel cock (if operator and may limit control ability, therefore, such accesso- equipped) is in the “OFF” position ries are not recommended. and that there are no fuel leaks. Use caution when adding electri- ...
Instrument and control functions To lock the steering EAU10462 EAU54301 Main switch/steering lock (off) All electrical systems are off. The key can be removed. EWA16371 WARNING Never turn the key to “ ” or “LOCK” while the vehicle is moving. Other- wise the electrical systems will be switched off, which may result in LOCK...
This warning light comes on if a prob- lem is detected in the engine or other vehicle control system. If this occurs, have a Yamaha dealer check the on- 1. Turn. board diagnostic system. Insert the key and turn it to “ ”.
Instrument and control functions odometer EAU78331 Multi-function meter unit tripmeter Consider the following tips to reduce tachometer 2 3 4 fuel consumption: fuel meter Avoid high engine speeds during transmission gear display acceleration. Travel at a constant speed. ...
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“ODO” and the tripmeter ments and the fuel level warning Red zone: 9000 r/min and above “TRIP”. indicator “ ” start flashing. If this oc- curs, have a Yamaha dealer check the electrical circuit.
Instrument and control functions Transmission gear display EAU1234M EAU12352 Handlebar switches Pass switch “ ” Press this switch to flash the headlight. Left When the dimmer switch is set to “ ”, the passing switch has no ef- fect. EAU12401 Dimmer switch “...
Instrument and control functions EAU12713 EAU12822 EAU12872 Start switch “ ” Clutch lever Shift pedal Push this switch to crank the engine with the starter. See page 5-1 for start- ing instructions prior to starting the en- gine. 1. Clutch lever 1.
Instrument and control functions when the brake lever is being EAU78900 EAU78910 Brake lever Brake pedal pulled, but this does not indicate a malfunction. The unified brake system does not operate when the brake pedal is pressed down directly. 1.
Instrument and control functions EAU13003 EAU13213 Fuel tank cap Fuel The fuel tank cap cannot be installed Make sure there is sufficient gasoline in unless the key is in the lock. In addi- the tank. tion, the key cannot be removed if the EWA10882 WARNING cap is not properly installed and...
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Use only unleaded gasoline. The use plastic parts. [ECA10072] of leaded gasoline will cause severe Your Yamaha engine has been de- 4. Be sure to securely close the fuel damage to internal engine parts, signed to use regular unleaded gaso- tank cap.
The exhaust system is hot after op- ohol containing methanol is not eration. To prevent a fire hazard or recommended by Yamaha because it burns: can cause damage to the fuel system Do not park the vehicle near or vehicle performance problems.
Instrument and control functions 3. Lift the front of the seat and pull it EAU78851 EAU68420 Seat Adjusting the shock absorber forward. assemblies To remove the seat EWA10211 To install the seat WARNING 1. Remove panels A and B. (See 1.
EAU15306 Sidestand adjusting ring with the position in- Yamaha dealer repair it if it does not The sidestand is located on the left dicator on the shock absorber. function properly. side of the frame. Raise the sidestand ...
Instrument and control functions EAU78340 Ignition circuit cut-off system The ignition circuit cut-off system (comprising the sidestand switch, clutch switch and neutral switch) has the following functions. It prevents starting when the transmission is in gear and the sidestand is up, but the clutch le- ver is not pulled.
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2. Turn the key on. stand during this inspection. • 3. Shift the transmission into the neutral position. If a malfunction is noted, have a Yamaha 4. Push the start switch. dealer check the system before riding. Does the engine start? With the engine still running: 5.
• If necessary, add recommended oil to specified level. 6-11 • Check vehicle for oil leakage. • Check operation. • If soft or spongy, have Yamaha dealer bleed hydraulic system. • Check brake pads for wear. • Replace if necessary. 6-22, 6-22 Front brake •...
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• Make sure that operation is smooth. • Check throttle grip free play. Throttle grip 6-16, 6-26 • If necessary, have Yamaha dealer adjust throttle grip free play and lubricate ca- ble and grip housing. • Make sure that operation is smooth. Control cables 6-26 •...
”, or if the warning light re- mains on, see page 3-2 for the warn- ing light circuit check. 2. Shift the transmission into the neutral position. The neutral indi- cator light should come on. If not, ask a Yamaha dealer to check the electrical circuit.
Operation and important riding points 3. Start the engine by pushing the EAU16673 ECA10261 Shifting NOTICE start switch. Even with the transmission in If the engine fails to start when us- ing the start switch, release it, wait the neutral position, do not a few seconds, and then try again.
Operation and important riding points EAU17214 Parking When parking, stop the engine, and then remove the key from the main switch. EWA10312 WARNING Since the engine and exhaust system can become very hot, park in a place where pedestri- ans or children are not likely to touch them and be burned.
To avoid possible burns, let tivities incorrectly may increase brake components cool before your risk of injury or death during touching them. service or while using the vehicle. If you are not familiar with vehicle ser- vice, have a Yamaha dealer perform service.
From 30000 km (17500 mi), repeat the maintenance intervals starting from 6000 km (3500 mi). Items marked with an asterisk should be performed by a Yamaha dealer as they require special tools, data and tech- nical skills.
(10500 mi) (14000 mi) • Perform dynamic inspection us- Diagnostic system √ √ √ √ √ √ ing Yamaha diagnostic tool. check • Check the error codes. √ √ • Clean. 2 * Air filter element √ √ • Replace.
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Periodic maintenance and adjustment ODOMETER READING ANNUAL ITEM CHECK OR MAINTENANCE JOB 1000 km 6000 km 12000 km 18000 km 24000 km CHECK (600 mi) (3500 mi) (7000 mi) (10500 mi) (14000 mi) • Check tread depth and for dam- age.
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Periodic maintenance and adjustment ODOMETER READING ANNUAL ITEM CHECK OR MAINTENANCE JOB 1000 km 6000 km 12000 km 18000 km 24000 km CHECK (600 mi) (3500 mi) (7000 mi) (10500 mi) (14000 mi) Shift pedal pivot • Lubricate with lithium-soap- √...
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Periodic maintenance and adjustment ODOMETER READING ANNUAL ITEM CHECK OR MAINTENANCE JOB 1000 km 6000 km 12000 km 18000 km 24000 km CHECK (600 mi) (3500 mi) (7000 mi) (10500 mi) (14000 mi) • Check operation and free play. • Adjust the throttle cable free play Throttle grip hous- √...
Periodic maintenance and adjustment To install the cowling EAU18724 Removing and installing the Place the cowling in the original posi- cowling and panels tion, and then install the bolt. The cowling and panels shown need to be removed to perform some of the maintenance jobs described in this chapter.
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Periodic maintenance and adjustment Panel B To remove the panel 1. Slide the panel lock cover open, insert the key into the lock, and then turn it 1/4 turn clockwise. 1. Screw To install the panel 2. Pull the front of the panel out, and 1.
1. Cowling A ating improperly. Do not attempt to can reveal the condition of the engine. 2. Y.R.C.S (Yamaha Ram–Air Cooling System) diagnose such problems yourself. In- stead, have a Yamaha dealer check To remove the spark plug 3.
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3. Install the spark plug cap. 4. Install the Y.R.C.S. (Yamaha Ram- 1. Spark plug gap To check the engine oil level Air Cooling System) cap by install- 1.
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Periodic maintenance and adjustment ficiently before removing the oil NOTICE: Do not filler cap. [EWA17640] The engine oil should be between the operate the vehicle until you minimum and maximum level marks. know that the engine oil level is 4. If the engine oil is below the mini- sufficient.
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“ENERGY CONSERVING II” or Make sure that the O-ring is properly 6-8.) higher. seated. 2. Remove the Y.R.C.S. (Yamaha Make sure that no foreign mate- Ram-Air Cooling System) cap. 7. Install the engine oil drain bolt and rial enters the crankcase.
Tightening torque: Bleed bolt: 7 N·m (0.7 kgf·m, 5.1 lb·ft) 5. Install the Y.R.C.S. (Yamaha Ram- Air Cooling System) cap. 6. Install the cowling. 1. Air filter case cover 2. Screw 6-14...
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Periodic maintenance and adjustment 3. Lightly tap the air filter element to piston(s) and/or cylinder(s) may remove most of the dust and dirt, become excessively worn. and then blow the remaining dirt [ECA10482] out with compressed air as shown. Replace the air filter element if it is ex- cessively worn or damaged.
1. Throttle grip free play the engine idling speed, turn the screw in direction (b). Throttle grip free play: 3.0–7.0 mm (0.12–0.28 in) Periodically check the throttle grip free play and, if necessary, have a Yamaha dealer adjust it. 1. Idle adjusting screw 6-16...
Tire air pressure (measured on cold from occurring, the valve clearance small area of road contact. Therefore, it tires): must be adjusted by a Yamaha dealer is essential to maintain the tires in good 1 person: Front: at the intervals specified in the periodic condition at all times and replace them 175 kPa (1.75 kgf/cm², 25 psi)
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Size: or glass fragments in it, or if the side- surface must first be “broken 2.75-18M/C 42P wall is cracked, have a Yamaha dealer Manufacturer/model: in” for it to develop its optimal replace the tire immediately. CHENG SHIN/C910 characteristics.
If any damage is found, have skip steps 4–7. a Yamaha dealer replace the wheel. Do not attempt even the 4. Fully turn the adjusting bolt at the smallest repair to the wheel. A de-...
There should be no free play at the adjusting nut in direction (a). To brake lever end. If there is free play, decrease the clutch lever free have a Yamaha dealer inspect the play, turn the adjusting nut in di- brake system. rection (b).
To check the brake pad wear, check point that the wear indicator reaches these precautions: 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.
As the brake pads wear, it is normal for EAU22724 Changing the brake fluid low air to enter the brake sys- the brake fluid level to gradually go Have a Yamaha dealer change the tem, reducing braking down. A low brake fluid level may indi- brake fluid at the intervals specified in performance.
EAU78831 3. Measure the drive chain slack as To adjust the drive chain slack shown. Consult a Yamaha dealer before ad- justing the drive chain slack. 1. Take the motorcycle off the cen- terstand, and then put the side- stand down.
WARNING After adjusting the brake pedal free For a thorough cleaning, have a play, check the operation of the Yamaha dealer remove the drive chain brake light. and soak it in solvent. 9. Make sure that the drive chain 2. Spray Yamaha chain lubricant or...
Periodic maintenance and adjustment EAU23144 Recommended lubricant: Recommended lubricants: Checking and lubricating the Lithium-soap-based grease Brake lever: brake and clutch levers Silicone grease The operation of the brake and clutch Clutch lever: Lithium-soap-based grease levers should be checked before each ride, and the lever pivots should be lu- bricated if necessary.
Checking and lubricating the Lubricating the swingarm piv- Lithium-soap-based grease centerstand and sidestand The swingarm pivots must be lubricat- ed by a Yamaha dealer at the intervals specified in the periodic maintenance and lubrication chart. Recommended lubricant: Lithium-soap-based grease The operation of the centerstand and...
2. Hold the lower ends of the front fork does not operate smoothly, tion. WARNING! To avoid injury, fork legs and try to move them for- have a Yamaha dealer check or re- securely support the vehicle so ward and backward. If any free pair it.
(See page 6-8.) hub or if the wheel does not turn sparks, flames, cigarettes, etc., This model is equipped with a VRLA smoothly, have a Yamaha dealer away from the battery and pro- (Valve Regulated Lead Acid) battery. check the wheel bearings.
To charge the battery 3. Fully charge the battery before Have a Yamaha dealer charge the bat- installation. NOTICE: When in- tery as soon as possible if it seems to stalling the battery, be sure to have discharged.
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3. Turn the key to “ ” 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. Fuse 1. Spare fuse 2. Starter relay holder 2.
Periodic maintenance and adjustment EAU78872 Replacing the headlight bulb This model is equipped with a halogen bulb headlight. If the headlight bulb burns out, replace it as follows. ECA10651 NOTICE Take care not to damage the follow- ing parts: Headlight bulb 1.
1. Auxiliary light bulb 11. Have a Yamaha dealer adjust the 2. Auxiliary light bulb socket headlight beam if necessary. 3. Remove the burnt-out bulb by pulling it out.
Periodic maintenance and adjustment EAU78920 EAU24205 Replacing the brake/tail light Replacing a turn signal light bulb bulb 1. Remove the seat. (See page 3-11.) 1. Remove the turn signal light lens 2. Remove the brake/tail light bulb by removing the screw. socket (together with the bulb) by turning it counterclockwise.
Periodic maintenance and adjustment EAU78970 EAU24361 Replacing the license plate Front wheel light bulb EAUW3361 1. Remove the license plate light unit by removing the nuts. To remove the front wheel EWA10822 WARNING To avoid injury, securely support the vehicle so there is no danger of it 1.
Periodic maintenance and adjustment 3. Place the vehicle on the center- 2. Insert the wheel axle, and then in- EAU25081 Rear wheel stand, and then remove the axle stall the axle nut. nut. 3. Take the vehicle off the center- EAU78751 4.
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Periodic maintenance and adjustment 1. Axle nut 1. Brake pedal free play adjusting nut 1. Washer 2. Brake camshaft lever 2. Collar 4. Remove the brake pedal free play 3. Drive chain puller locknut 3. Wheel axle adjusting nut, and then discon- 4.
However, should your motorcycle the washer and the wheel axle require any repair, take it to a Yamaha from the right side. dealer, whose skilled technicians have 3. Install the washer and the axle nut.
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Periodic maintenance and adjustment heaters or furnaces. Gasoline or gasoline vapors can ignite or ex- plode, causing severe injury or prop- erty damage. 6-40...
Remove the spark plug and check the electrodes. The engine does not start. Have a Yamaha dealer check the vehicle. Check the compression. 4. Compression The engine does not start. There is compression.
Some models are equipped with matte colored finished parts. Be ble. Rust and corrosion can develop Cleaning sure to consult a Yamaha dealer for even if high-quality components are ECA10773 NOTICE used. A rusty exhaust pipe may go un-...
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Motorcycle care and storage off any detergent residue using shield. Test the product on a plenty of water, as it is harmful small hidden part of the wind- Salt sprayed on roads in the winter to plastic parts. shield to make sure that it does may remain well into spring.
EWA11132 poorly ventilated room or cover- WARNING ing it with a tarp, while it is still Consult a Yamaha dealer for ad- Contaminants on the brakes or tires wet, will allow water and humid- can cause loss of control.
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Motorcycle care and storage 2. Fill up the fuel tank and add fuel e. Remove the spark plug cap stabilizer (if available) to prevent from the spark plug, and then Make any necessary repairs before the fuel tank from rusting and the install the spark plug and the storing the motorcycle.
These identification numbers are needed when registering the vehicle with the authorities in your area and when ordering spare parts from a Yamaha dealer. VEHICLE IDENTIFICATION NUMBER: 1. Vehicle identification number 1. Engine serial number The vehicle identification number is The engine serial number is stamped stamped into the steering head pipe.
Vehicle status and engine perfor- mance data Fuel-injection and emission-relat- ed data Yamaha will not disclose this data to a third party except: With the consent of the vehicle owner Where obligated by law For use by Yamaha in litigation ...
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