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:

Assembling the main axle and drive axle
1. Install: Toothed washer "1" Circlip "2" NOTE: Be sure to install the circlip so that its sharp edge "a" is facing away from the toothed washer and gear. Be sure the circlip ends "b" are positioned at the axle spline groove "c". 2. Install: 2nd pinion gear "1" NO ...

Checking the relays
Check each switch for continuity with the pocket tester. If the continuity reading is incorrect, replace the relay. 1. Disconnect the relay from the wire harness. 2. Connect the pocket tester ( × 1) and battery (12 V) to the relay terminal as shown. Check the relay operation. Out ...

Checking and lubricating the brake and clutch levers
Brake lever Brake lever Clutch lever Clutch lever The operation of the brake and clutch levers should be checked before each ride, and the lever pivots should be lubricated if necessary. Recommended lubricants:Brake lever: Silicone grease Clutch lever: Lithium-soap ...