I bought this motor for a Chinese pitbike frame. This thing is a beast. I still have the stock carb on for now. It bogs a little from zero to half throttle if you really crank it. Once your past quarter your good to rip. It's got a ton of power. So much that it's eating my tubes faster than I can get a rim lock on. I weigh 230 or so and i tear it up on this thing. I smoked my friend on a crf 110. I have another frame sitting here and as soon as I save up some money, I'm building it up with this engine no questions asked.