Yamaha YZF-R125 Service Manual: Checking the shift forks

Yamaha YZF-R125 Service Manual / Engine / Transmission / Checking the shift forks

The following procedure applies to all of the shift forks.

1. Check:

  • Shift fork cam follower "1"
  • Shift fork pawl "2" Bends/damage/scoring/wear
    Replace the shift fork.

Checking the shift forks


2. Check:

  • Shift fork guide bar Roll the shift fork guide bar on a flat surface.

    Bends  Replace.


WARNING

Do not attempt to straighten a bent shift fork guide bar.

Checking the shift forks


3. Check:

Shift fork movement (along the shift fork guide bar) Rough movement Replace the shift
forks and shift fork guide bar as a set.

Checking the shift forks


    Transmission
    ...

    Checking the shift drum assembly
    1. Check: Shift drum groove Damage/scratches/wear Replace the shift drum assembly. Shift drum segment "1" Damage/wear  Replace the shift drum assembly. Shift drum bearing "2" ...

    Other materials:

    Installing the thermostat
    1. Install: Thermostat NOTE: Install the thermostat with its breather hole "a" facing up. 2. Install: Copper washer Coolant temperature sensor CAUTION:Use extreme care when handling the coolant temperature sensor. Replace any part that was dropped or subjected to ...

    Checking the front brake disc
    1. Remove: Front wheel Refer to "FRONT WHEEL" on page 4-6. 2. Check: Brake disc Damage/galling Replace. 3. Measure: Brake disc deflection Out of specification Correct the brake disc deflection or replace the brake disc. a. Place the vehicle on a suitable stand ...

    Intake air temperature sensor
    1. Check: Intake air temperature sensor resistance Out of specification Replace the throttle body. a. Connect the pocket tester ( × 1k) to the throttle body sensor assembly coupler as shown. Positive tester probe brown/white "1" Negative tester probe gray/black ...

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