Time to jump start this blog. Yeah,yeah,yeah these motors are not supposed to run over 3600 RPM. But im sure lots of us have them on minibikes,fun karts etc. We run what we got. My question- how do we give these motors the best chance of survival? i would think quality synthetic oil as a start? How about drilling holes in the crank journals? A raingutter type system to drip oil on the top of the crank at the bearing? A couple of 6000rpm blasts on a minibike is all ill need. Its been done successfully. (so far!)