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

Removing the 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.

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 0.013-0.018 mm (0.0005-0.0007 in)

Limit 0.25 mm (0.0098 in)

Oil-pump-housing-to-inner-andouter- rotor clearance 0.06-0.11 mm (0.0024-0.0043 in)

Limit 0.18 mm (0.0071 in)

3. Check:

• Oil pump operation

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

Assembling the oil pump

1. Lubricate:

• Inner rotor
• Outer rotor

Recommended lubricant Engine oil

2. Lubricate:

• Oil pump shaft (with the recommended lubricant)

Recommended lubricant Molybdenum disulfide grease

3. Install:

• Oil pump driven gear
• Oil pump housing "1"
• Oil pump outer rotor "2"
• Oil pump inner rotor "3"
• Pin "4"
• Oil pump housing cover

TIP

When installing the inner rotor, align the pin "4" in the oil pump driven gear with the groove "a" in the inner rotor.

4. Check:

• Oil pump operation

Installing the oil pump

1. Install:

• Oil pump assembly

Oil pump assembly screw 4 Nm (0.4 m*kgf, 2.9 ft*lbf)

NOTICE

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

Transmission (YP125R)

Removing the transmission

Removing the transmission

Removing the transmission

1. Remove:

• Transmission case cover

TIP

Loosen each bolt 1/4 of a turn at a time, in stages and in a crisscross pattern. After all of the bolts are fully loosened, remove them.

Checking the transmission

1. Check:

• Transmission gears

Blue discoloration/pitting/wear → Replace the defective gear(s).

• Transmission gear dogs

Cracks/damage/rounded edges → Replace the defective gear(s).

2. Check:

• Transmission gear engagement (each pinion gear to its respective wheel gear) Incorrect → Reassemble the transmission axle assemblies.

3. Check:

• Transmission gear movement

Rough movement → Replace the defective part(s).

Installing the transmission

1. Install:

• Oil seal "1"
• Oil seal "2"

Oil seal installed depth 0-0.5 mm (0-0.020 in)

a. Oil seal installed depth

See also: