man, I know this is an old thread but this is a sick quad, im doing the same engine in an 85 LT250r frame, did you have any issues with vibration? everyone says it will vibrate too much because of not having a counterbalancer. I was think of using rubber mounts to dampen it, but is that even nescessary? i dont mind a little vibration as long as it doesnt crack the fram like people seem to say it does.