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What would a 420cc engine equal in horsepower?

To calculate the approximate horsepower of a 420cc engine, you can use the following formula:

Horsepower = (Engine Displacement in cubic centimeters / 1500) x 2

Horsepower = (420 / 1500) x 2

= 0.28 x 2

= 0.56 horsepower

Therefore, a 420cc engine is approximately equivalent to 0.56 horsepower.