My 9.8 outboard motor propeller is over spinning when I give over 1/2 throttle. it jerks the whole motor back and forth while doing it.?

Other answer:

Its either damaged or the wrong pitch prop. The jerking is a sign of damage. Usually if it was the wrong pitch it would still be smooth.
was this motor running on this boat ok before. or is it new to the boat ? it almost sounds like a short shaft engine on a long shaft boat'' ck shaft length
find your dealer ask about prop size if this wright size if ok best check lower end good luck
damaged prop