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with the sprocket swap I went from a 15 tooth in front to a 16 tooth, and a 40 tooth in the rear, so the change was drastic, bumped my top speed from 55mph up to almost 65mph in 5th gear with the engine running 9,500 rpm, but I still have enough power to use shift up to 5th gear slow as 35mph on flat roads.
once I rebuild the engine (21,000 mies on a 125cc engine that runs at 9,000rpm) it should have a bit more power, and higher compression so my mileage should go up again, this rebuild should cost around $150 if I use all new oem parts from the dealer.
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