What is 574 cc in horsepower a riding lawnmower?

Horsepower = (Cubic Centimeters / 12,566)

So, for a riding lawnmower with a 574 cc engine, the horsepower would be:

Horsepower = (574 / 12,566)

≈ 0.0458

Therefore, a 574 cc riding lawnmower engine has approximately 0.0458 horsepower.