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 ...