Yamaha BR250F - Oil Pump

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 until the
securing pin is opposite the slot in the
gear case. Remove the pin and remove
the pump from the gear case.
~ @~ Oil Pump Drive Shaft
~
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.
2·4