How Motorcycles Work

Take the working principle of a four-stroke engine and a two-stroke engine as an example:

Four-stroke engines are widely used. Four-stroke engines mean that the cylinder fires once every four reciprocating movements of the piston. The specific working principle is as follows:

1. Intake: At this time, the intake valve opens, the piston descends, and the mixture of gasoline and air is sucked into the cylinder.

2. Compression: At this time, the intake valve and exhaust valve are closed at the same time, the piston goes up, and the mixture is compressed.

3. Combustion: When the mixer is compressed to a minimum, the spark plug flashes and ignites the mixture, and the pressure generated by the combustion pushes the piston down and drives the crankshaft to rotate.

4. Exhaust: When the piston descends to the lowest point, the exhaust valve opens, the exhaust gas is discharged, and the piston continues to ascend to discharge the excess exhaust gas.