honestly i can't tell ya one way or the other, ive done both....sadly all my stuff is drag raced once its warmed up, but all my customers and anything that i don't personally own are ran through somewhat of heat cylces..ive had great luck going both ways, my blue bike on alcohol is still running the same pistons for 3 years now, never done any break in on it but then agian everything was right from the get go. Look at it this way, if its not going to handle it now its never going to handle it....but then again there is always that "but what if i had taken it easy for a while" :biggrin: