i've got this very high pitch tapping noise coming out my engine.it gets a little quieter after it warms up some. the noise stops when i'm going up an incline. like when the motor is under pull or tourqe. i hope its not something worn because this motor only has about 100 miles on it. its really loud. it actually hurts my ears. its like something is tapping inside.more of a tapping than a raddle.