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the TT250 with a 229cc CG motor (167FMM), has a torque peak of 5500 RPM and a horsepower peak of 7000 RPM. I have seen 8200 RPM in top gear when I had the stock gearing (17/50). These bikes are geared way, way to short, but if you gear them up proper, 1st gear ends up too tall. They really need a wide ratio transmission or a 6 speed.
what I have noticed is gearing taller doesn't really add to your top speed, the top speed is about the same with a 46 rear sprocket, what changes is the RPM you are doing at that top speed. That is because the power curve is so flat up top...
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