i was told by an experienced dirt bike riding mate that if you do too many wheelies/ monos you can run the motor dry of oil due to the location of the oil pick up. especially if they are for a long distance???? anyone know anything? my 99 400 has developed a noise that sounds bearing'ish'. thought initially it was just valves and took to mechanic and he said only my middle inlet valve needed adjustment. wwhen i got it back no noise but once its warm it sounds noisey. i notice it most with the clutch pulled in when i give it a rev. back to mechanic.