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 piston pin
    1. Check: Piston pin Blue discoloration/grooves  Replace the piston pin and then check the lubrication system. 2. Measure: Piston pin outside diameter "a" Out of specification Replace the piston pin. 3. Measure: Piston pin bore diameter "b" Out of specifica ...

    Checking the fuel pressure
    1. Check: Pressure regulator operation a. Remove the fuel hose connector cover "1" and disconnect the fuel hose "2" from the fuel pump. CAUTION:Although the fuel has been removed from the fuel tank, be careful when removing the fuel hose, since there may be fuel remaining i ...

    General information
    NOTICEThis manual was produced by MBK Industrie. primarily for use by Yamaha dealers and their qualified mechanics. It is not possible to include all the knowledge of a mechanic in one manual. Therefore, anyone who uses this book to perform maintenance and repairs on Yamaha vehi ...

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