We are putting in a hot camshaft, chrome valves, and new piston rings. Maybe a high compression piston but definitely new rings.
I have a powercore 4 slip on by fmf and will soon be getting a power bomb header.
I read that you should rebuild it every 50 hours of operating. I have a 08 raptor 250 that we are rebuilding for cross country racing.
Are you rebuilding this for racing, or because it's shot?
First of all, what kind of four wheeler, if it is sport and you are looking to do cross country type riding, I recommend razors by maxxis. They are designed by a cross country champion. Great drifting and good hookup.