DONT PUT A STREETBIKE ENGINE IN AN OFF ROAD MACHINE. It will be faster than hell in a straight line. But it won't turn or jump worth a damn because the weight distribution is all wrong. Sell the R1 motor and use the money to have Redline build and tune your Banshee motor. Then let it warm up properly and maintain it like you should and you won't have problems. I haven't had an engine problem in over 10 years because my Banshees are properly tuned and maintained.