Briefly describe the causes of low cylinder pressure

[VanKyle]

Briefly describe the causes of low cylinder pressure: 1. Air leakage between the cylinder head and the cylinder; 2. Air leakage between the spark plug sealing gasket and the cylinder head or air leakage from the pressure relief valve; 3. Air leakage from the crankcase; 4. Severe wear between the piston ring and the cylinder or piston ring sticking causing air leakage. The diagnostic methods for insufficient cylinder pressure are: 1. Unstable engine operation, popping sounds from the exhaust pipe or backfire in the carburetor; 2. Difficulty in cold start, with no significant change when climbing slopes; 3. Water droplets discharged from the exhaust pipe, backfire in the carburetor, or water leakage into or out of the crankcase. A cylinder refers to a cylindrical metal component that guides the piston to perform linear reciprocating motion inside the cylinder, which can be divided into: single-acting cylinders, double-acting cylinders, diaphragm cylinders, and impact cylinders.