There are two oil pumps; the Main Oil Pump and the Scavenger Oil Pump. I will list the procedure for both pumps.
Main Oil Pump
1) Put the bike up on the center stand
2) Remove the engine front cover
3) Remove the collar and O-ring seals from the oil pump cover
4) Remove the bolts and Phillips screws holding the oil pump cover on and remove the cover
5) Remove the dowel pins from the oil pump body
6) Remove the inner and outer rotors
7) Remove the drive pin and washer from the drive shaft and remove the oil pump body from the cylinder block - The drive shaft will remain in the cylinder block. (Do not lose the locating dowel in the cylinder block).
8) Clean all parts before replacing the new oil pump
9) Install in reverse order
NOTE: If it is necessary to remove the oil pump drive shaft, the cylinder block will have to be disassembled. Also it is a good idea to coat all parts with oil prior to installing the new pump.
Scavenger Oil Pump
1) Remove the engine from the frame
2) Remove the engine read cover
3) Remove the clutch outer housing
4) Remove the bolts holding the oil pump to the cylinder block and remove the pump
NOTE: Both of these pumps can be rebuilt with fairly easy and it's considerably less expensive to do so.
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