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Exclusively designed for the CG125 motorcycle engine, this piston is crafted from high-strength aluminum alloy (typically 2017 or 6061 grade) — chosen for its lightweight properties, excellent heat conductivity, and resistance to high-temperature engine conditions. It features a precision-machined top (with a flat or slight dome design to match the CG125’s combustion chamber), piston ring grooves (for compression and oil control rings), and a wrist pin bore (to connect to the connecting rod).
The piston’s outer diameter is tailored to the CG125’s standard cylinder bore (56.5mm, the key dimension for 125cc displacement), with ultra-tight tolerances (±0.02mm) to ensure a proper seal with the cylinder wall. It also includes anti-friction coatings on the skirt (reducing wear from cylinder contact) and heat-treated ring grooves (enhancing durability). As a direct OEM-compatible part, it fits seamlessly with the CG125’s connecting rod, cylinder, and piston rings, making it ideal for engine rebuilds, repairs, or performance maintenance.
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) |
What engine model is this piston designed for?
This piston is exclusively designed as a direct OEM-compatible replacement part for the CG125 motorcycle engine.
What is the standard outer diameter and tolerance of the piston?
The standard outer diameter is 56.5mm, designed to match the CG125's cylinder bore with a strict manufacturing tolerance of ±0.02mm.
How does the piston handle high operating temperatures?
It is made from a heat-resistant, high-strength aluminum alloy (typically 2017 or 6061 grade) combined with anti-friction skirt coatings to withstand continuous operating temperatures up to 250°C.
Is this piston compatible with standard connecting rods?
Yes, it features a 15mm wrist pin bore diameter, making it fully compatible with the CG125's standard connecting rod wrist pin for a hassle-free OEM fit.
What layout does the piston top use?
The piston is available with either a flat top (standard) or a slight dome design to match and optimize the CG125's combustion chamber dynamics.
Can this piston be used for engine performance upgrades?
Yes, while it is ideal for OEM standard rebuilds, it can also serve as a base for mild displacement tweaks, such as when paired with a 57mm overbore cylinder.
