The working process of the two-stroke engine is as follows:
1. The piston moves the mixed airflow into the crankcase.
2. The piston descends the mixing air pressure to the combustion chamber to complete the first compression.
3. After the mixture is delivered to the cylinder, the piston is closed and the intake and exhaust ports are closed. When the piston compresses the gas to the minimum volume (this is the second compression), the spark plug is ignited.
4. The pressure of the combustion pushes the piston downward. When the piston descends to a certain position, the exhaust port opens first, the exhaust gas is sent out and the air inlet is opened, and the new mixed gas enters the cylinder to exhaust the remaining exhaust gas.
At the same speed, because the two-stroke engine burns more times than the four-stroke, the power is large, and the two-stroke engine is much lighter than the four-stroke engine of the same displacement, so the second flush in the motorcycle has an overwhelming advantage. However, since the intake and exhaust of the two-stroke engine are simultaneously performed, when the engine speed is low, since the exhaust port is opened for a long time, a part of the fresh mixture gas is discharged together with the exhaust gas from the exhaust port, so The power is not high at the bottom speed, and the new two-stroke engine has added some components to improve this problem such as YAMAHA YPVS, HONDA's ATAC SUZUKID SAEC. Due to the coke produced by the combustion engine oil and the intake and exhaust holes on the cylinder wall, the two-stroke engine wears much faster than the four-stroke engine.