I have a 87 250x it has been board to a 285 white brohters high compresion dome pistion race cam,vales,springs also ha white brother race clutch as well as a dg race pipe carb has been jeted to a .40 and a k&n air filter and it goes from 0 to 60 in about 3 sec and tops out at 75 and thats almost to the point to when you can here it top out but iv never toped it out so oh ya its for sale as well