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:

    Measuring the compression pressure
    NOTE: Insufficient compression pressure will result in a loss of performance. 1. Measure: Valve clearance Out of specification →Adjust. Refer to "ADJUSTING THE VALVE CLEARANCE" on page 3-3. 2. Start the engine, warm it up for several minutes, and then turn it off. 3. Remove: ...

    Installing the front wheel (disc)
    1. Install: Front brake disc NOTE: Be sure to install the front brake disc with the arrow mark "a" on the disc facing out. Tighten the brake disc bolts in stages and in a crisscross pattern. 2. Check: Front brake disc Refer to "CHECKING THE FRONT BRAKE DISC" on page 4 ...

    Checking and replacing the rear wheel sprocket
    1. Check: Rear wheel sprocket More than 1/4 tooth "a" wear Replace the rear wheel sprocket. Bent teeth Replace the rear wheel sprocket. b. Correct 1. Drive chain roller 2. Rear wheel sprocket 2. Replace: Rear wheel sprocket a. Remove the self-locking nuts and the ...

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