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How many hp is a 420 cc engine?

To determine the horsepower of a 420 cc engine, we can use the following formula:

Horsepower = (Engine Displacement in cubic centimeters / 125 )

Given Engine Displacement = 420 cc

Horsepower = 420cc / 125 cubic centimeters per horsepower

Horsepower ≈ 3.36 horsepower

Therefore, a 420 cc engine has approximately 3.36 horsepower.