Product Overview This high-precision 54mm Piston Kit is the professional choice for restoring power to your 125cc horizontal engine. Designed for top-tier durability, it features a 14mm wrist pin configuration, making it a direct fit for most performance-oriented Chinese Pit Bikes and ATVs. Product Compatibility Optimized for 125cc "Honda-clone" horizontal engines (typically featuring a 4-speed manual or semi-auto transmission). Vehicle Type Common Compatible Brands & Models Dirt Bike / Pit Bike SSR 125, Apollo 125, Piranha, Pitster Pro, Thumpstar ATV / Quad TaoTao, Baja, Kazuma, Sunl, Coolster, Jetmoto (125cc Models) Engine Series 154FMI / 125cc Horizontal Engines Fitment Note Fits Horizontal engines ONLY; NOT for 125cc Vertical engines Specifications Component Metric Measurement Imperial Measurement Piston Diameter 54mm 2.12" Wrist Pin Diameter 14mm 0.55" Wrist Pin Length 41mm 1.61" Engine Type 4-Stroke Horizontal -- Material Premium High-Grade Aluminum Alloy -- Key Features Heavy-Duty Aluminum Construction: Cast from high-grade aluminum alloy to ensure maximum durability and resistance to thermal expansion under racing conditions. Precision Gas Sealing: Includes a full set of high-tension rings designed to minimize blow-by and recover lost engine compression. Optimized for 125cc Performance: Specifically weighted and balanced for horizontal engine crankcases to reduce vibration and improve throttle response. Superior Wear Resistance: The piston surface and rings are engineered to withstand the friction of high-RPM operation, extending the life of your cylinder. Standard OEM Dimensions: Manufactured to exact 54mm/14mm specifications for a seamless replacement without the need for engine modifications.
