I was doing some reading and the only major complaint I could gather was just the lack of grunt. A 650 should have a little kick. Not Ninja power but enough to get out of own way. So that being said if I shop around I should be able to find a big CC dirt bike and make the conversion. 2 strokes just have that surge of power you just don't get in the same size or CC 4 stroke bikes. Top end isn't important to me that just pull your arms out the socket pull like you get from a all out dirt bike. Not to mention suspension and ground clearance.