Hello, I have a 99 Drifter 1500 and the motor Is a little noisy. kinda sounds like the lifters so I spoke to a bike mechanic and he said on the rear cylinder at the back of the cylinder closer to the right side there is a cap with a nut. he told me to remove cap and inside, there Is an adjustment that can be made to quiet the motor. Does anyone know of this and has anyone performed this on there bike and If so, can you tell me how It Is done exactly? Thanx Danny O´