Yamaha YZF-R125 Service Manual: Checking the crankshaft

Yamaha YZF-R125 Service Manual / Engine / Crankshaft / Checking the crankshaft

1. Measure:

  • Crankshaft runout Out of specification Replace
    the crankshaft, bearing or both.

NOTE:

Turn the crankshaft slowly.


Checking the crankshaft


2. Measure:

  • Big end side clearance Out of specification Replace
    the crankshaft.

3. Measure:

  • Crankshaft width Out of specification 
    Replace the crankshaft.

3. Measure:

  • Crankshaft width Out of specification Replace the crankshaft.

4. Check:

  • Crankshaft sprocket Damage/wear Replace the
    crankshaft.
  • Bearing Cracks/damage/wear Replace the
    crankshaft.

5. Check:

  • Crankshaft journal Scratches/wear Replace the
    crankshaft.
  • Crankshaft journal oil passage Obstruction Blow out with
    compressed air.
    Removing the crankshaft
    1. Remove: Crankshaft "1" NOTE: Remove the crankshaft with the crankcase separating tool "2". Make sure the crankcase separating tool is centered over the crankshaft. CAUTIO ...

    Installing the crankshaft
    1. Install: Crankshaft "1" NOTE: Install the crankshaft with the crankshaft installer pot "2", crankshaft installer bolt "3", adapter (M12) "4" and spacer (crankshaft installer) "5". ...

    Other materials:

    Checking the clutch plates
    The following procedure applies to all of the clutch plates. 1. Check: Clutch plate Damage Replace the clutch plates as a set. 2. Measure: Clutch plate warpage (with a surface plate and thickness gauge "1") Out of specification Replace the clutch plates as a set. ...

    Adjusting the brake pedal free play
    Adjusting the brake pedal free play Brake pedal free play The brake pedal free play should measure 3.5-4.5 mm (0.14-0.18 in) as shown. Periodically check the brake pedal free play and, if necessary, have a Yamaha dealer adjust it. WARNING An incorrect brake pedal free play in ...

    Handlebar switches
    Left Left 1. Pass switch "PASS" 2. Dimmer switch "/" 3. Turn signal switch "/" 4. Horn switch"" Right Right Engine stop switch "/" Start switch"" Pass switch "PASS" Press this switch to flash the headlight. Dimmer switch "/" Set this switch to"" for the high beam an ...

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