What are the causes of insufficient cylinder pressure?

[DelGia]

The causes of insufficient cylinder pressure: 1. Air leakage between the cylinder head and the cylinder. Step on and rotate the engine to check for oil foam at the joint surface of the cylinder head and the cylinder. If there is oil foam, it indicates air leakage at the cylinder head gasket. Check whether the tightening nuts on the cylinder head are tightened; 2. Severe wear between the piston ring and the cylinder or piston ring seizure causing air leakage; 3. Damaged spark plug sealing gasket or surface contamination, or forgetting to install the spark plug sealing gasket, can all lead to air leakage between the spark plug sealing gasket and the cylinder head, resulting in insufficient cylinder pressure. The cylinder is composed of a cylinder barrel, end cover, piston, piston rod, and sealing elements.