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:

    Starting failures
    Engine 1. Cylinder and cylinder head - Loose spark plug - Loose cylinder head or cylinder - Damaged cylinder head gasket - Damaged cylinder gasket - Worn or damaged cylinder - Incorrect valve clearance - Improperly sealed valve - Incorrect valve-to-valve-seat contact - Incorrect valve timi ...

    Avoid Carbon Monoxide Poisoning
    All engine exhaust contains carbon monoxide, a deadly gas. Breathing carbon monoxide can cause headaches, dizziness, drowsiness, nausea, confusion, and eventually death. Carbon Monoxide is a colorless, odorless, tasteless gas which may be present even if you do not see or smell any en ...

    Checking the fid (fast idle solenoid)
    1. Disconnect: FID (fast idle solenoid) coupler 2. Check: FID (fast idle solenoid) resistance a. Disconnect the FID (fast idle solenoid) coupler from the FID. b. Connect the pocket tester ( × 10) to the terminals of the FID (fast idle solenoid). Positive tester probe ...

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