Re: **important Questions**
I had the same thing happen to me the very first time I tried to start mine. It happened three times in a row until the wheel was shot. I ended up removing links and eliminating the tensioner as well and would just slide the wheel backwards to adjust the chain. On the other hand, when I put the kit onto another bike, I went the other way, with the tensioner and drilled that hole in the chainstay and never had a problem.
Having thought about it a lot, I think this issue may arise when the top chain is too tight by one tooth on the sprocket, if that makes any sense.