How to judge whether the valve clearance of motorcycle is too small

The valve clearance must be adjusted when the car is cold, and the valve clearance will change when it is hot, whichever is cold. If the power decreases after adjustment, the idle speed is unstable, and the clearance should be reduced, it should be adjusted in time, otherwise it will not only affect the normal use, but also increase the pressure load of the rocker arm and camshaft and increase the wear.

Principle of internal combustion engine

Take the working principles of four-stroke engine and two-stroke engine as examples:

Four-stroke engines are widely used. Four-stroke engine means that every four times the piston reciprocates, the cylinder ignites once. 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 moves upward, and the mixture is compressed.

3. Combustion: When the mixer is compressed to the minimum, the spark plug ignites the mixed gas, and the pressure generated by combustion pushes the piston to move downward and drives the crankshaft to rotate.

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

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