2-Stroke 38cc

Two stroke engines do not have valves, which greatly simplifies their structure and reduces their own weight.Two stroke engines are ignited once per revolution, while four stroke engines are ignited once every other revolution. This gives the two-stroke engine an important power foundation.

The two-stroke engine can run in any direction, which is important in certain equipment such as chain saws. A standard four stroke engine may malfunction when the fuel shakes, unless it is standing upright. Solving this problem will greatly increase the flexibility of the engine.

Two-stroke gasoline engines are preferred when mechanical simplicity, light weight, and high power-to-weight ratio are design priorities. By mixing oil with fuel, they can operate in any orientation as the oil reservoir does not depend on gravity.

A number of mainstream automobile manufacturers have used two-stroke engines in the past, Two-stroke engines are still found in a variety of small propulsion applications, such as outboard motors, small on- and off-road motorcycles, mopeds, motor scooters, motorized bicycles, tuk-tuks, snowmobiles, go-karts, RC cars, ultralight and model airplanes.

Two-stroke motorbike with an expansion chamber exhaust system that increases the cylinder charge.

Although the principles remain the same, the mechanical details of various two-stroke engines differ depending on the type. The design types vary according to the method of introducing the charge to the cylinder, the method of scavenging the cylinder (exchanging burnt exhaust for fresh mixture) and the method of exhausting the cylinder.