I am having a problem with my throttle and was hoping someone out there could help me. The old throttle tube and cam gear were old and stripped very badly so I purchased a new cam and throttle tube from one of the larger parts suppliers. The cam gear was a perfect match to the original but the tube was different. It had a type of black plastic collar near the section that goes into the assembly and it didn't slide in a smoothly as the original one did. Then once I put it all together it was very stiff. It seems that the slot in the tube where the piece from the cover plate slides thus holding the tube in place is thinner than the original so there is quite a drag. Called the parts guy and he placed a top cover in the slot and tube they had on the shelves and found the same problem. Said they would have to contact BMW with this issue. Now I can't use the bike. Anybody have any ideas????