- Fitment: Designed specifically for the Chinese GY6 4-stroke 170cc 157QMI Engine featuring a 76mm bolt pattern. Not suitable for engines with an 80mm bolt pattern. - Material: Constructed from high-quality aluminum alloy, this cylinder assembly is lightweight yet robust, providing superior heat dissipation and the strength needed to endure cylinder pressure and loads. - Specifications: - Inner Diameter: 61mm - Outer Diameter: 65mm - Piston Pin Outer Diameter: 15mm - Package Includes: - Cylinder - Piston - Piston Ring - Piston Pin - Piston Pin Clip - Valve Oil Seal - Gaskets - Tensioner Gasket - Exhaust Gasket - Intake & Exhaust Studs - Exhaust Nut Key Benefits: This cylinder assembly provides essential performance enhancements for your engine, ensuring optimal operation and longevity. It is ideal for repairs or upgrades, making it a perfect choice for mechanics and DIY enthusiasts. Use Scenarios: 1. Engine Overhaul: Perfect for a complete engine rebuild, ensuring all components work seamlessly together. 2. Performance Upgrade: Enhance your scooter or small vehicle's power output and efficiency with this reliable assembly. 3. Routine Maintenance: Ideal for routine checks and replacements to maintain engine health and performance. Choose this aluminum alloy cylinder assembly to ensure your GY6 170cc engine runs smoothly and efficiently.