Bringing up an old post. The bike tops out about 35 mph on a flat road and the throttle stop screw is opened up all the way. The sprocket is stamped as a 53 tooth and has a three bolt pattern. I have a smaller 44 tooth that has the 4 bolt pattern, just not enough time to get it machined to fit. Any ideas how to get the bike to do about 40 mph without the sprocket change? Thanks!