Does anyone have ideas as to why my bike won't go faster down hill? It acts like there is speed limiter. I have a 48CC motor on a 26" crusier frame and 44 tooth sprocket. My motor runs well. It has over 2000 miles on it. It goes about 26-27 mph top speed. I got it to 33 once, don't know what was different that day? But the wierd thing is that it won't go faster down hill. One would think that it would speed up but the engine holds it back. Why is that?