Is that you Prodigit from the scooter forum ? Anyway, These OHV only have so much HP. If you gear them to tall they won't pull the gearing unless your 5'5 and 105 lbs.. I'm 6'3 and 255 lbs. I changed my factory gearing to 16/38 . It was just a little to tall. Just wouldn't pull it worth a darn with my big wind catching ass on it. I had to drop one tooth on the front (worth 3-4 teeth on the rear) At 62 indicated (actually 57 or 58) and got 80 MPG . That's about the best I can do with it. Hell, my Ninja 250 can get 70 or better at that moderate speed.