Considering an 8hp Briggs & Stratton engine, which typically has a maximum power output of around 2900 RPM (revolutions per minute), and assuming a 2:1 gear ratio (two teeth on the driven sprocket for every one tooth on the driving sprocket), the go-kart's maximum theoretical speed can be calculated.
Using the formula:
Speed (in miles per hour) = [Gear Ratio * Engine RPM * Tire Diameter (in inches)] / [336 * Number of Driven Sprocket Teeth]
Assuming a 2:1 gear ratio, 2900 RPM engine speed, and a 12-inch tire diameter, we get:
Speed = (2 * 2900 * 12) / (336 * 1)
Speed ≈ 168.75 mph
Important Note: This calculated speed assumes ideal conditions and no power loss due to friction, drivetrain inefficiencies, or other factors. In reality, the actual top speed of the go-kart will be significantly lower due to these factors and the added weight of the driver.
Therefore, while an 8hp Briggs & Stratton engine can theoretically propel a go-kart to speeds of nearly 170 mph, the practical top speed of a typical go-kart with this setup would likely be in the range of 25-35 mph.
