Oil Pump - Yamaha BR250F Service Manual

C. Oil Pump
Plunger
Adjusting Pulley
1. Loosen the four gear-case bolts, and
remove the gear case/oil pump assembly
from the engine.
2. Remove the two gear case screws and
open the gear case.
3. Remove the snap ring and the two
washers, and remove the drive gear. Note
the relative positions of the washer. The
wave washer is against the drive gear.
4. Rotate the oil-pump drive shaft u ntil the
securing pin is opposite the slot in the
gear case. Remove the pin and remove
the pump from the gear case.
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Oil Pump Drive Shaft
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5. Remove the drive shaft from the oil
pump. Inspect the bearing surfaces of
the shaft and the gear teeth. If any part
of the shaft is worn or pitted, the shaft
must be replaced.
The oil pump should not be disas-
sembled unless the pump stroke must be
checked. If a problem with the pump is
noted (such as excessive oil consump-
tion) proceed as follows:
6. Remove the oil pump cover.
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