So I have recently purchased a cateye. As of right now, it needs a carb cleanout, and will only run while choked. Top speed is right around 24 miles per hour, and it takes forever to get there. I am 147lbs and the bike needs a good push just to get going. I'd like to change out the front and rear sprockets to something that will get me better acceleration, without severely compromising top speed. It already goes only 24 mph, i dont want it going much slower than that. I was thinking about switching the front sprocket to a 17 tooth, but I don't know about the rear. Any suggestions?