The specific reasons for the cylinder pull of the engine of the Tricycle Motorcycle capped power unit

There are roughly three reasons why the engine of the Tricycle Motorcycle capped power unit pulls the cylinder:

1. The roundness and cylindricity tolerance of the cylinder liner exceeds the allowable range: the sealing between the piston and the cylinder liner is greatly reduced, and the high-temperature gas in the cylinder flows downward, destroying the oil film between the piston and the cylinder wall, thereby causing cylinder pull.
2. The cylinder liner is deformed during the assembly process: for example: the protrusion of the upper end surface of the cylinder liner is too large, and the cylinder liner is deformed after the cylinder head is installed; the water blocking ring of the cylinder liner is too thick, which causes the cylinder liner to be deformed after being pressed into the body. .are easy to cause the cylinder to pull.
3. The piston ring gap is too small: If the opening gap, side gap or back gap of the piston ring is too small, the piston ring will expand due to heat and become stuck when the engine is running, and it will be pressed tightly against the cylinder wall, or the piston ring will break, which will easily cause the engine to malfunction. Cylinder wall pull-up grooves.
4. Piston pin jumps out: Because the piston pin circlip is not installed or falls off or breaks, the piston pin jumps out during movement, which can easily strain the inner wall of the cylinder, causing the cylinder to blow by to the axle box.