Yamaha BR250F - Page 29

1. Place the washer on the oil pump drive
shaft,
and insert the drive shaft into the
oil pump. Be sure the worm gear correct-
ly engages
the oil pump gear in the
pump.
2. Secure the pump to the gear case. Use a
new gasket. Apply
Yamabond 4 to the
gear case side of the gasket only.
3. Align
the hole in the drive shaft with the
slot in the gear case and install the secur-
ing pin.
4. Thoroughly grease
the outer edges of the
drive gear onto the oil pump drive shaft.
Be sure
the gear correctly engages the
securing pin.
5. Secure
the drive gear in place with the
two washers and the snap ring. Be sure
the wave washer is against the drive gear.
6. Grease
the edges of the drive gear, and
install the gear case cover.
2-18
7. Install the oil pump gear box onto the
engine. Be sure the drive gear correctly
engages
the oil pump drive gear on the
crankshaft. Torque the four securing
bolts to specification.
Tightening
torque:
0.68 m-kg (4.9 ft-lb)
Bleeding
the Oil Pump
The oil pump must be bled whenever:
Any portion of the oil system has been
disconnected.
The machine has been turned on its side.
Whenever
the oil tank has been run
empty.
During predelivery.
There are
two methods for bleeding the pump
on this model. Either will work very well.
1. Loosen
the bleed screw at the pump. Oil
should begin to flow
through the line.
Keep
the bleed screw open until all air
has left
the fuel Iine. Tighten the bleed
screw.
2.
Start the engine and keep it running at
idle. Pull the pump stroke wire all the
way out to set the pump at maximum
stroke. Keep
the pump operating at full
stroke for about two minutes. This will
bleed
the air from the oil system.