I had trouble with two or three chains and several sprockets. Switched to sidewinder sprockets and the ti-II smart chain that never needs to be lubed and 16000 lbs tensile strength. No more troubles, I am a 225 lb rider and drag race and am the current four stroke record holder at Thunder Road Sand Drags in Oklahoma, with a 4.26 seconds and a 1.41 sixty ft. time so you can imagine I need a strong setup.