that's a good question. And that's why i say it was broken in right. I heat soaked it twice before getting on the throttle at all. (not sure if that really helps or not but i did it anyway) really warmed it up, took it easy for the first twenty min or so of the ride, then after that i wasn't scared to run wide open, not more than a few seconds at a time, but wide open non the less. After about 3/4 tank of gas i started running it like a stole it. Wide open for about 1/4 mile, and it ran really good. Couldn't complain anyway. I checked my pistons for blow by and any scoring every 1/4 tank of gas or so, just to make sure, keep an eye on them and see how they were breaking in. Not everyone will agree with this method of break in, but i do. A few buddies of mine use the same method, but on their older sleds. One of them broke his 03 700 rmk in at the drags, and it's a screamer. Really really runs well for the sled that it is. Keeps up with all the d8's in our group on problem.