I have a 93 KDX 250 and the rear wheel hops at 3rd gear and up, basically higher speeds. It doesn't seem to matter if it is hardpack, sand, or blacktop. I did put all new bearings and seals in the rear suspension so I highly doubt that is it. I talked to a guy that works at the dealership and he thought it may be the shock, or a bent rim. Any ideas?