My son had this spare carb that I think was off a Japanese dirt bike. I decided to try it on my 70cc 2 stroke. A couple modifications and it was on. It runs great at low and high throttle but sputters at mid throttle. I'll probably have to to move the needle clip up or down and see if that will help with the mid throttle sputter. Any other suggestions? The best part about this carb is I no longer get the fuel drips on the bottom of the float bowl. The needle has rubber on the tip so it seams to seal better.