Removing The Balancer Weight Gear And Oil Pump; Checking The Oil Pump - Yamaha YFM250RX 2008 Service Manual

OIL PUMP AND BLANCER WEIGHT GEAR
REMOVING THE BALANCER WEIGHT
GEAR AND OIL PUMP
1. Straighten the lock washer tab.
2. Remove:
• Balancer weight gear nut
• Lock washer
• Balancer weight gear
NOTE: NOTE:
Place the aluminum plate
drive gear and balancer weight gear
and then loosen the balancer weight gear nut
.
3. Remove:
• Oil pump assembly

CHECKING THE OIL PUMP

1. Check:
• Oil pump driven gear
• Oil pump housing
• Oil pump cover
Cracks/damage/wear
defective part(s).
2. Measure:
• Inner-rotor-to-outer-rotor-tip clearance
• Outer-rotor-to-oil-pump-housing clearance
• Oil-pump-housing-to-inner-rotor-and-outer-
rotor clearance
Out of specification → Replace the oil
pump.
Inner rotor
Outer rotor
Oil pump housing
4-53
ENG
between balancer
,
→
Replace the