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250 cc does not correllate to HP. Little 250 CC bikes are the fastest class of motorcyles--turbocharged, 10,000 rpm, high compression fuel injection running nitromethane--yikes! The most efficient engines would be very tiny but have all the ups and extras. Different 250cc engines put out anything from 1-100 horsepower. Essentially, it depends on how the engine is designed and what its intended purpose is.

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10y ago

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