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This motorcycle cylinder suitable for small-displacement scooters with a 50cc engine, such as QJ50QT-18D, SYM50, and AMA50. As a core component of the engine, it accommodates the piston and forms the combustion space. The heat dissipation fins on its exterior help dissipate heat quickly during operation, ensuring the stable operation of the engine. Its bore diameter is 37mm.
The cylinder's bore is machined to exact tolerances, ensuring a perfect seal with piston rings, maximizing compression and minimizing power loss.
Cast iron or alloyed aluminum with wear-resistant liners resists wear from piston movement and combustion, extending engine life.
Features cooling fins (for air-cooled 50cc models) that efficiently dissipate heat, preventing overheating and maintaining engine stability.
Designed specifically for 50cc, it integrates flawlessly with the crankcase, cylinder head, and other engine components, ensuring easy installation and reliable performance.
Essential for restoring engine performance when replacing worn or damaged cylinders during full engine overhauls.
Used to fix issues like low compression, excessive oil consumption, or cylinder scoring in 50cc engines.
A base component for bore-up kits or displacement upgrades for 50cc based engine modifications.
Utilized by motorcycle manufacturers or assemblers for new 50cc production or engine component replacements.
| Specification Item | Details |
|---|---|
| Model Compatibility | 50cc motorcycle engine |
| Material | Cast iron (standard); Aluminum alloy with cast-iron liner (performance variant) |
| Bore Diameter | 37mm |
| Stroke Compatibility | Matches 50cc crankshaft stroke |
| Cooling Type | Air-cooled (integrated cooling fins for heat dissipation) |
| Mounting Interface | Matches 50cc crankcase and cylinder head bolt patterns |
| Piston Compatibility | Standard 50cc piston |
| Operating Temperature | Up to 250°C (under normal engine operation) |
| Service Life | Up to 30,000-50,000 km (varies with maintenance and riding conditions) |
| Certification | Complies with motorcycle engine component quality standards |
It is designed for small-displacement scooters with a 50cc engine, including models such as QJ50QT-18D, SYM50, AMA50, and other compatible variants matching the mounting interface.
The cylinder is precision engineered with a standard bore diameter of 37mm, which ensures optimal compression and a secure fit.
The cylinder is available in a standard cast iron construction or a performance variant using an aluminum alloy with a wear-resistant cast-iron liner.
It utilizes an air-cooling mechanism equipped with integrated exterior cooling fins, which quickly dissipate heat and prevent the engine from overheating during operation.
Under normal riding conditions and with consistent engine maintenance, this cylinder has an expected service life of 30,000 to 50,000 km.
