How fast is a 3.5 hp mini bike engin?

The top speed of a 3.5 hp mini bike engine depends on several factors such as the weight of the bike, the drivetrain, and the overall design. Generally, a 3.5 hp mini bike engine can reach speeds of up to 25-30 miles per hour. However, it's important to note that these speeds can vary depending on the specific bike and its components.