Ok... Now I have a serious problem. I have a frame mounted hua sheng skyhawk 2 setup on a schwinn skyliner. I finally got my engine running and everything working about the way I like it and today the bike starts falling apart. When I pedal, the chain does not engage the wheel anymore. It's like it freewheels in both directions. How can I fix this do you suppose? Will I need a new cassette or a new wheel maybe? ANy ideas how I could fix this problem? I wanted to get some advice here before I rip the rear wheel off my bike. Any ideas are greatly appreciated. Thanks!