| Model | HM50/GY50 |
| CYL DIA | 39 |
| TOTAL HIGH | 33.5 |
| COMP DIST | 19 |
| RING | 08*0.8*2.0 |
| PIN DIA | 13 |
| PIN LENGTH | 31 |

CYL DIA (Cylinder Diameter): The cylinder diameter is 39. A larger cylinder diameter generally allows for more air - fuel mixture to be combusted in each stroke, which can potentially increase the power output of the engine. For motorcycles and tricycles, this dimension directly impacts the engine's displacement and, consequently, its torque and horsepower capabilities.
TOTAL HIGH (Total Height): With a total height of 33.5, this parameter is crucial for maintaining the correct mechanical clearances within the engine. It ensures that the piston moves smoothly within the cylinder without hitting other components, such as the cylinder head or the crankshaft, during the four - stroke cycle (intake, compression, power, and exhaust).
COMP DIST (Compression Distance): The compression distance is 19. This distance plays a significant role in determining the compression ratio of the engine. A proper compression ratio is essential for efficient combustion. A higher compression ratio can lead to better fuel - air mixture combustion, resulting in improved power and fuel efficiency, but it also requires higher - octane fuel to prevent knocking.
RING: The ring specifications are 0.80.82.0. The piston rings are vital components that seal the combustion chamber, preventing the escape of combustion gases and controlling the oil flow between the piston and the cylinder wall. The given dimensions ensure a proper fit and effective sealing, reducing blow - by and improving the overall efficiency of the engine.
PIN DIA (Pin Diameter): The pin diameter is 13. The piston pin connects the piston to the connecting rod, and its diameter affects the strength and durability of this connection. A larger diameter pin can handle higher loads and transmit the forces more effectively during the engine's operation.
PIN LENGTH: The pin length is 31. The length of the piston pin also contributes to the stability and proper functioning of the piston - connecting rod assembly. It ensures that the forces are evenly distributed and that the piston moves in a straight line within the cylinder.
The piston rings, with dimensions of 0.80.82.0, are made from high - quality alloy cast iron. Alloy cast iron provides outstanding wear - resistance and high - temperature resistance. In the engine, the piston rings are constantly in contact with the cylinder wall, experiencing significant friction and high temperatures. The wear - resistance of the alloy cast iron ensures that the piston rings can maintain their shape and sealing function over an extended period, reducing the likelihood of gas leakage and oil consumption issues. The high - temperature resistance enables the piston rings to withstand the intense heat generated during combustion, ensuring reliable engine performance even under extreme operating conditions.
| Model | HM50/GY50 |
| CYL DIA | 39 |
| TOTAL HIGH | 33.5 |
| COMP DIST | 19 |
| RING | 08*0.8*2.0 |
| PIN DIA | 13 |
| PIN LENGTH | 31 |

CYL DIA (Cylinder Diameter): The cylinder diameter is 39. A larger cylinder diameter generally allows for more air - fuel mixture to be combusted in each stroke, which can potentially increase the power output of the engine. For motorcycles and tricycles, this dimension directly impacts the engine's displacement and, consequently, its torque and horsepower capabilities.
TOTAL HIGH (Total Height): With a total height of 33.5, this parameter is crucial for maintaining the correct mechanical clearances within the engine. It ensures that the piston moves smoothly within the cylinder without hitting other components, such as the cylinder head or the crankshaft, during the four - stroke cycle (intake, compression, power, and exhaust).
COMP DIST (Compression Distance): The compression distance is 19. This distance plays a significant role in determining the compression ratio of the engine. A proper compression ratio is essential for efficient combustion. A higher compression ratio can lead to better fuel - air mixture combustion, resulting in improved power and fuel efficiency, but it also requires higher - octane fuel to prevent knocking.
RING: The ring specifications are 0.80.82.0. The piston rings are vital components that seal the combustion chamber, preventing the escape of combustion gases and controlling the oil flow between the piston and the cylinder wall. The given dimensions ensure a proper fit and effective sealing, reducing blow - by and improving the overall efficiency of the engine.
PIN DIA (Pin Diameter): The pin diameter is 13. The piston pin connects the piston to the connecting rod, and its diameter affects the strength and durability of this connection. A larger diameter pin can handle higher loads and transmit the forces more effectively during the engine's operation.
PIN LENGTH: The pin length is 31. The length of the piston pin also contributes to the stability and proper functioning of the piston - connecting rod assembly. It ensures that the forces are evenly distributed and that the piston moves in a straight line within the cylinder.
The piston rings, with dimensions of 0.80.82.0, are made from high - quality alloy cast iron. Alloy cast iron provides outstanding wear - resistance and high - temperature resistance. In the engine, the piston rings are constantly in contact with the cylinder wall, experiencing significant friction and high temperatures. The wear - resistance of the alloy cast iron ensures that the piston rings can maintain their shape and sealing function over an extended period, reducing the likelihood of gas leakage and oil consumption issues. The high - temperature resistance enables the piston rings to withstand the intense heat generated during combustion, ensuring reliable engine performance even under extreme operating conditions.