100CC BICYCLE ENGINE KIT: The 4 stroke engine features a strong 3.5HP horsepower, a displacement of 100cc, a rated power of 2kw/h, plus a max rotating speed of 3600RPM, which offers you with sturdy power and accelerates your bike to the max speed of 50km/h.Air-Cooled Engines: Using airflow to dissipate heat, these engines are more simple and lighte