Reasons for insufficient combustion:
1, the spark plug is not working well, and the fuel in the cylinder is not fully burned.
Solution: Repair the spark plug.
2. The engine ignition time is wrong, resulting in the engine not working normally.
Solution: Control the ignition time.
3. Bad starting habits, insufficient cylinder pressure and low engine temperature.
Solution: Adjust driving habits.
Extended data:
maintain
way
1. When it is difficult to start the cold car in winter, close the choke valve to start the engine, and pay attention to open the choke valve in time after the hot car. It is forbidden to drive at high speed for a long time with the throttle closed;
2. Riding vehicles (men's vehicles) are forbidden to install windshields or other decorative items in front of the engine and muffler, which will affect the heat dissipation of the engine and muffler;
3. Don't drive with heavy load and low speed for a long time, which will damage the engine and muffler;
4. Don't blow the throttle at high speed for a long time;
5. When there is oil stain on the muffler surface, the surface color will change color, yellow and blue after hot car. In addition, when there is a lot of dirt and other dirt on the muffler surface, please clean it in time to avoid affecting its heat dissipation;
6. When installing the muffler, pay attention to that the muffler pad is installed in place and fastened to prevent air leakage, which will affect the muffler effect and cause the muffler interface to yellow;
7. Engine valve clearance, carburetor, air filter, etc. Adjustment and cleaning should be carried out in a timely and correct manner according to the vehicle instructions. The valve clearance is too small or the mixture is too rich or too thin, which will affect the combustion, and then affect the muffler, resulting in discoloration.