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Machined to match the CG125’s 56.5mm cylinder bore with strict tolerances, ensuring optimal compression (critical for the 125cc engine’s power) and preventing oil leaks or pressure loss.
Made from heat-resistant aluminum alloy with skirt coatings, it withstands the 200–250°C temperatures of the CG125’s combustion chamber without warping or deformation.
Aluminum alloy construction reduces reciprocating mass, improving engine responsiveness and fuel efficiency — aligned with the CG125’s commuter-focused design.
Matches the CG125’s original piston dimensions (wrist pin bore, ring groove spacing), requiring no modifications for installation and ensuring compatibility with factory or aftermarket piston rings.
Essential for replacing worn or damaged pistons during full engine overhauls (e.g., after high mileage or cylinder scoring).
Fixes low engine compression (caused by piston wear or ring groove damage) to restore the CG125’s original power and start-up performance.
Used by repair shops to replace faulty pistons (e.g., cracked skirts, worn ring grooves) while maintaining the CG125’s factory engine specs.
Serves as a base for minor displacement tweaks (e.g., paired with a 57mm overbore cylinder) for riders seeking slight power gains without major engine modifications.
| Specification Item | Details |
|---|---|
| Model Compatibility | CG125 motorcycle engine |
| Material | High-strength aluminum alloy (2017/6061 grade) |
| Outer Diameter | 56.5mm (standard, matches CG125’s cylinder bore) |
| Wrist Pin Bore Diameter | 15mm (compatible with CG125’s connecting rod wrist pin) |
| Ring Grooves | 3 grooves (2 compression rings + 1 oil control ring) |
| Top Design | Flat top (standard) or slight dome (for optimized combustion) |
| Skirt Coating | Anti-friction graphite or molybdenum coating |
| Weight | ~120–140g (including piston pin boss) |
| Operating Temperature | Up to 250°C (continuous operation) |
| Tolerance (Outer Diameter) | ±0.02mm |
| Certification | Complies with motorcycle engine component standards (ISO 9001) |
The piston is crafted from high-strength aluminum alloy (typically 2017 or 6061 grade). This material is selected for its lightweight properties, outstanding heat conductivity, and high resistance to elevated engine temperatures.
It has a standard outer diameter of 56.5mm to perfectly match the CG125's standard cylinder bore. The manufacturing tolerance is tightly controlled within ±0.02mm to ensure a highly reliable seal.
No. It is designed as a direct OEM-compatible replacement part that matches the original CG125 specifications, including a 15mm wrist pin bore and standard ring groove spacing.
Thanks to its heat-resistant aluminum construction and skirt coatings, the piston is built to withstand continuous combustion chamber operating temperatures of up to 250°C without warping.
By utilizing a lightweight aluminum alloy, the piston minimizes reciprocating mass in the engine. This improves overall throttle responsiveness and fuel efficiency, keeping with the CG125's commuter-friendly design.
