Yamaha XMAX YP125R - Service manual > Oil pump (YP250R)

Removing the oil pump
Removing the oil pump

Removing the oil pump
Removing the oil pump

Checking the oil pump

1. Check:

Cracks/damage/wear → Replace the defective part(s).

2. Measure:

Out of specification → Replace the oil pump.

Checking the oil pump

1. Inner rotor

2. Outer rotor

3. Oil pump housing

Inner-rotor-to-outer-rotor-tip clearance

Less than 0.15 mm (0.0059 in) Limit 0.23 mm (0.0091 in)

Outer-rotor-to-oil-pump-housing clearance 0.013-0.036 mm (0.0005-0.0014 in)

Limit 0.106 mm (0.0042 in)

Oil-pump-housing-to-inner-andouter- rotor clearance 0.04-0.09 mm (0.0016-0.0035 in) Limit 0.16 mm (0.0063 in)

3. Check:

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

Checking the oil pump

Assembling the oil pump

1. Lubricate:

Recommended lubricant Engine oil

2. Lubricate:

Recommended lubricant Molybdenum disulfide grease

3. Install:


When installing the oil pump shaft, align the pin in the oil pump shaft with the groove "a" in the inner rotor.

Assembling the oil pump

4. Check:

Installing the oil pump

1. Install:

Oil pump assembly bolt 7 Nm (0.7 m*kgf, 5.1 ft*lbf)


After tightening the bolts, make sure the oil pump turns smoothly.

See also:

 Yamaha XMAX YP125R - Service manual > Electric starter (YP250R)

Removing the starter motor Disassembling the starter motor

 Yamaha XMAX YP125R - Service manual > Transmission (YP250R)

Removing the transmission Removing the transmission

Maxi Scooters: