Charon
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It would probably be easier, cheaper, and more effective to just transplant the engine from a 600 cc sportbike into it. Or for that matter, an even bigger engine. The engine speed is limited by the relatively long stroke, and there isn't much that can be done about that. That leaves increasing torque as the route to more power, power being the product of torque and rpm. Torque can be increased only by increasing average cylinder pressures. You quickly run into a limit there with the limits of fuel quality, and will have to move to ethanol or methanol to get the higher octane required. You could try to find high octane racing fuel, at quite high prices, if you preferred. You will be interested to know that these are the very same limits that have existed since the days of the Model T.
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