For a 250 its suprising. It would only do like 55-56 mph with 20 inch tires on it. With 22 inch, it would do 60mph on the rev limiter in 5th. Now I have a rev box that will let it rev higher, but I havent tried to see how fast. I bought a kfx400 and lost interest in the 250. With the 22" tires it didn't seem to lose any bottom end, it actually runs better. I have not had 1 reliability issue at all. I was trail riding (30+ mile trails) with it almost every weekend. Its starts just as easy as stock. I will sell any of the parts off of it as my wife rides it now and she does not care about going fast...i'll use the money for my kfx400....also I have an extra rev box....