How do you replace oil pump on 660 raptor?

To replace the oil pump on a Yamaha Raptor 660, begin by draining the engine oil and removing the oil filter. Next, remove the engine cover to access the oil pump, disconnecting any necessary components like the oil lines and bolts securing the pump. Install the new oil pump, ensuring proper alignment and torque specifications, then reassemble the engine cover and replace the oil filter before adding fresh oil. Always consult the service manual for specific instructions and torque settings.