Yamaha YZF-R125 Service Manual: Checking the oil pump

Yamaha YZF-R125 Service Manual / Engine / Oil pump / Checking the oil pump

1. Check:

Oil pump drive gear
Oil pump driven gear
Oil pump housing
Oil pump housing cover Cracks/damage/wear Replace the
defective part(s).

2. Measure:

Inner-rotor-to-outer-rotor-tip clearance "a"
Outer-rotor-to-oil-pump-housing clearance "b"
- Oil-pump-housing-to-inner-rotor-and-outerrotor clearance "c"

Out of specification Replace
the oil pump.

Checking the oil pump

1. Inner rotor

2. Outer rotor

3. Oil pump housing

3. Check:

Oil pump operation Rough movement Repeat steps (1)
and (2) or replace the defective part(s).

Checking the oil pump

Assembling the oil pump

1. Lubricate: Oil pump inner rotor Oil pump outer rotor Oil pump driven gear (with the recommended lubricant) 2. Install: Oil pump outer rotor Oil pump inner rotor "1" Oil pump dr ...

Other materials:

Unstable handling
Handlebars - Bent or improperly installed right handlebar - Bent or improperly installed left handlebar 1. Steering head components - Improperly installed upper bracket - Improperly installed lower bracket (improperly tightened ring nut) - Bent steering stem - Damaged ball bearing or bearing ...

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 ...

Checking the crankshaft
1. Measure: Crankshaft runout Out of specification Replace the crankshaft, bearing or both. NOTE: Turn the crankshaft slowly. 2. Measure: Big end side clearance Out of specification Replace the crankshaft. 3. Measure: Crankshaft width Out of specification&nbs ...