Piston, Piston Rings, Piston Pins and Connecting Rods

The pistons are made of a high temperature-resistant aluminum alloy. A depression is cast into the head of each piston to prevent interference with the valves.

Piston pins are of the semi-floating type. They are fastened to the connecting rods with pressure fittings, which allows the piston to travel freely during its stroke.

The piston rings have a slightly larger diameter than the piston. The top compression ring is made of stainless steel and the lower compression ring is cast iron. Both compression rings are flexible, allowing them to press against the cylinder wall and prevent fuel mixture leakage from the cylinder. The oil ring assembly consists of an oil ring and two rails. The oil ring scrapes oil from the cylinder wall to prevent it from entering the combustion chamber.