Air cooling is the cooling of the engine by the natural wind when driving. Scooters use fans. Current motorcycles are water cooled, oil cooled and air cooled. Among them, water cooling is the best heat dissipation, and air cooling is the worst.
Two-stroke engines are now rare, with only 50CC and racing models still using two-stroke engines. His advantage is: explosive power is good, quick can be said to be violent!