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:

Adjusting the throttle cable free play
NOTE: Prior to adjusting the throttle cable free play, the engine idling speed should be adjusted. 1. Check: Throttle cable free play "a" Out of specification →Adjust. 2. Remove: Right side panel Refer to "GENERAL CHASSIS" on page 4-1. 3. Adjust: Throttle cable f ...

Adjusting the engine idling speed
The engine idling speed must be checked and, if necessary, adjusted as follows at the intervals specified in the periodic maintenance and lubrication chart. The engine should be warm before making this adjustment. Remove panel A. Check the engine idling speed and, if necessary, ...

Checking the front brake lever free play
Checking the front brake lever free play Brake lever free play The brake lever free play should measure 2.0-5.0 mm (0.08-0.20 in) as shown. Periodically check the brake lever free play and, if necessary, have a Yamaha dealer check the brake system. WARNING An incorrect brake le ...