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What are the horspower ratings on a 83 Honda 250r atc?

Engine horsepower:

- Stock = 24-25 horsepower

- Aftermarket port and polished cylinder (+38mm bore) = 29-32 horsepower

- Fully modified cylinder (+38mm bore) = 45-50 horsepower

Tire horsepower:

- Stock = 19-20 horsepower

- Aftermarket port and polished cylinder (+38mm bore) = 25-27 horsepower

- Fully modified cylinder (+38mm bore) = 35-38 horsepower