I see now why SPB on their website advises that one has already built a motorbicycle prior to trying to install their shift kit. Although I've ridden a colleague's bike I've never built one myself. I purchased a beach cruiser, 66cc motor (that I have yet to turn over, but that's a different matter) and SBP HD Deluxe Shift Kit II. After much wringing of hands and cursing, I got the thing together. As previously mentioned, I'm having issues with my engine not turning over, so there has been much pedaling and releasing the clutch. First the chain on the left side, from the engine to the sproket broke, I think maybe it was too loose. I removed a link and it seems tight but not too tight. Then, the chain on the right side, from the sprocket to the freewheel came off, when the shaft the sprockets are on came loose somehow, I allen wrenched those locks on the sprockets almost until the wrench bent. I don't see how I could have made them any tighter, and I did grind the shaft where the sprocket is screwed onto, as directed. It doesn't seem I could have made it any tighter and it still came off. Could it be that the chain was too tight? I suppose it's a good thing that I'm having these chain issues before I get the motor working but I have to admit I'm getting frustrated, having spent so much time and money on this project and have yet to have had even one ride. I think I have to get the jackshaft right before I can address the engine-not-starting problem. Anyone else have issues like this with a shift kit? What did you do about it?