What solutions do we have based on the problem of the tractor exhaust pipe catching fire?

The fuel did not burn completely in time, and even did not reach the peak of combustion. As the engine enters the next stroke, the mixture that is still burning is discharged. The reasons and troubleshooting methods for this phenomenon are as follows:

(1) The fuel injection advance angle is too small. The solution is to adjust the advance angle and replace the worn parts.

(2) The solution for misaligned valve timing or simply incorrect gear installation is to correct it in a timely manner.

(3) Part of the fuel injectors are blocked, and the oil outlet valve is occasionally severely worn. The solution is to replace the worn parts.

(4) The exhaust valve is not tightly closed, the valve spring is too weak, the spring is broken, or the valve clearance is too small. The solution is to grind or replace the valve and adjust the valve clearance.

(5) The sealing of the fuel injector needle valve is poor and there is oil dripping. The solution is to replace the needle valve.

(6) Some valve push rods are bent or stuck. The solution is to replace the worn parts.