i just rebuilt my blaster top end and i had a problem with the motor over revving when no one was on throttle. Also it would only run with the choke on i finally found out why it was doing this. It turns out that there was a hole in the bottom of my crank case so i am on a budget cause I am 16 and don't have a job so it was of course leaking oil i got out the jb weld and after three layer of it it fixed the problem no more hole. no more oil leak and best of all it run great i also just rebuilt my other blaster. its a 1995 blaster bored 0.50 over racing reeds (not sure what kind) a wiseco piston and rings and custom paint job in progress i am going to look at (probity buy) another blaster tomorrow for $350 this guy to it completely apart to paint and has all parts ,but he doesn't remember how to put it back together or doesnt have time he said the motor ran when he tor it apart.