Hey all... I just bought a new yz450f and am gonna' break it in tomorrow...I read the hard and heavy break in thread here and am wondering this...O.K>, as for the rings it seems like a sound philosophy but is it REALLY safe on the INITIAL break-in? Which involves MUCH MORE than just the rings...ALL meeting surfaces have to mate correctly and many other initial internal interactions take place during that initial break in..I can see doing it that way on the first cylinder rebuild but feel sketchy about the harsh and hard right off the showroom floor. I would just like to hear opinions from experienced mechanics. I spent a healthy chunk of hard earned dollars on that baby and I have always used the easy break in on my other bikes and they have all held up well. My worry is that the hard break in might be GREAT on the cylinder performance but what will be the long term affect on the bottom end?