This motor is amazing!!! I had a little trouble with getting it running right at first, because it didn't come with an exhaust gasket... which would have been nice to know when I ordered the motor. But anyways I put it in my bike and get it running right and I'm pulling power wheelies with a bald back tire in the dirt. This motor is so torquey, it'll go up just about any incline around me in 2nd gear, and I live in a hilly area. I'd recommend this motor to anyone looking for bolt in HP. I'm at sea level with a d section exhaust and I have the needle at 1 above the richest setting and the fuel screw at 2.5 turns out, I also got a NGK cr6hsa plug and it works perfect. Incase anyone was wondering. Worth every penny