What is the reason of serious carbon deposition in two-stroke electric sprayer spark plug?

1. When the engine works normally, the gasoline and engine oil that normally enter the combustion chamber cannot be completely burned in the cylinder under the condition of insufficient oxygen supply, resulting in soot and burnt particles of lubricating oil. When the engine continues to run. Further oxidized into colloid. Firmly adhered to the top of piston, piston ring, back of valve, inner surface of intake pipe, throttle body and combustion chamber. Under the repeated action of high temperature, colloid becomes asphaltene, colloid and carbon, thus forming carbon deposit. 2. Crankcase ventilation settings. In order to prevent air pollution, automobile design engineers directly introduce the exhaust gas from the engine into the intake manifold and enter the combustion chamber with fresh air for combustion. The high-temperature oil vapor fills the intake manifold with fresh air, one part of which adheres to the pipe wall and the back of the valve, and the other part is mixed with the injected fuel at the intake valve to form mixed vapor, which enters the combustion chamber and is discharged from the vehicle after combustion. The air quality is very poor. Because the inhaled air contains fine dust, it can't be completely filtered out in the air filter, and it washes the back of the valve together with oil and gas. After a long time, it will produce fine scratches. Particles and lubricating oil in the crankcase are stored in scratches, which will form paint at high temperature. After a long period of accumulation, they are mixed with wax and other components in fuel to form carbon deposits.