What is the cause of engine jitter or even flameout when starting?

1, too much carbon may be deposited, which will cause premature combustion and deflagration, shorten the service life of the engine and greatly reduce the power and economy of the engine;

2. There is carbon deposit on the working surface of the valve and its seat ring, which will cause the valve to leak due to lax closing, the engine is difficult to start, the work is weak, and the valve is easy to ablate.

3. Carbon and glue on the valve guide and valve stem will accelerate the wear of the valve guide and valve stem, and even cause the valve stem to move in the valve guide and get stuck, resulting in the failure of valve sticking;