The top speed of a 110cc go-kart engine can vary depending on several factors, including the specific engine model, the weight of the kart and driver, and the terrain and conditions in which it is being used. However, as a general guideline, a 110cc go-kart engine can typically reach speeds of around 20 to 30 miles per hour (32 to 48 kilometers per hour) on flat, paved surfaces. Some high-performance 110cc go-karts may be able to reach speeds of up to 40 miles per hour (64 kilometers per hour) or even higher.
It is important to note that go-karts with 110cc engines are typically designed for recreational use and are not intended for high-speed racing. For safety reasons, it is always important to follow the manufacturer's recommendations and guidelines for operating a go-kart, including wearing proper safety gear and using the kart in a safe and controlled environment.