Yamaha YZF-R125 Service Manual: Faulty clutch

Clutch slips

1. Clutch

  • Improperly assembled clutch
  • Improperly adjusted clutch cable
  • Loose or fatigued clutch spring
  • Worn friction plate
  • Worn clutch plate

2. Engine oil

  • Incorrect oil level
  • Incorrect oil viscosity (low)
  • Deteriorated oil

Clutch drags

1. Clutch

  • Unevenly tensioned clutch springs
  • Warped pressure plate
  • Bent clutch plate
  • Swollen friction plate
  • Bent clutch push rod
  • Broken clutch boss
  • Burnt primary driven gear bushing

2. Engine oil

  • Incorrect oil level
  • Incorrect oil viscosity (high)
  • Deteriorated oil
    Jumps out of gear
    Shift shaft Incorrect shift pedal position Improperly returned stopper lever Shift forks Worn shift fork Shift drum Incorrect axial play Worn shift drum groove Transmission ...

    Overheating
    Engine 1. Clogged coolant passages Cylinder head and piston Heavy carbon buildup 2. Engine oil Incorrect oil level Incorrect oil viscosity Inferior oil quality Cooling system 1. ...

    Other materials:

    Checking the thermostat
    1. Check: Thermostat Does not open at 80.5-83.5 C (176.9-182.3 F)  Replace. a. Suspend the thermostat "1" in a container "2" filled with water. b. Slowly heat the water "3". c. Place a thermometer "4" in the water. d. While stirring the water, observe the thermostat and th ...

    Checking the front wheel
    1. Check: Front wheel axle Roll the wheel axle on a flat surface. Bends → Replace. WARNINGDo not attempt to straighten a bent wheel axle. 2. Check: Tire Front wheel Damage/wear → Replace. Refer to "CHECKING THE TIRES" on page 3-23 and "CHECKING TH ...

    Troubleshooting method
    The engine operation is not normal and the engine trouble warning light comes on. 1. Check: Fault code number a. Check the fault code number displayed on the FI diagnostic tool. b. Identify the faulty system with the fault code. Refer to "Self-Diagnostic Function table". c. Identi ...

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