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:

    Protective apparel
    The majority of fatalities from motorcycle accidents are the result of head injuries. The use of a safety helmet is the single most critical factor in the prevention or reduction of head injuries. Always wear an approved helmet. Wear a face shield or goggles. Wind in your unprotecte ...

    Chain drive
    Removing the drive chain 1. Stand the vehicle on a level surface. WARNINGSecurely support the vehicle so that there is no danger of it falling over. NOTE: Place the vehicle on a suitable stand so that the rear wheel is elevated. ...

    Checking the turn signal relay
    1. Check: Turn signal relay input voltage Out of specification →The wiring circuit from the main switch to the turn signal relay coupler is faulty and must be repaired. a. Connect the pocket tester (DC 20 V) to the turn signal relay terminal as shown. - Positive tester probe  b ...

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