The os cv is a good motor the only problem is that it doesn't have much power. It is only rated at . 57 hp. But they run good and are easy to tune. The cvr would be a little better its 1.0hp and is still as easy to tune but more power. And the price is only about 30 bucks more. But if you buy the used cv I wouldn't give more than 40 for it because you can buy them for 79.00.