How fast would a kohler 20hp lawnmower motor make mini bike go?

It is difficult to accurately estimate the top speed a mini bike powered by a 20 horsepower Kohler lawnmower motor could reach as it depends on multiple factors such as the weight of the vehicle, transmission system, terrain and tire size. However, it's essential to approach such project with proper considerations on safety. Mini bikes can quickly gain speeds that outpace their designed safety mechanisms.