ok ive got a 04 ec 300 im getting ready to do the top end on it this bike has never been touched bike has great power and compression ect but i just cant see not rebuilding it the guy i got it off of never rode it much it still had the factory chain and sprockets olny thing ever done to it was he put a rekluse in it what is the best piston to use as far as gaskets im going to use factory thanks for the advise guys im going to try and race this bike this yr want it as best as possible