Upgrade your motorcycle's performance with this complete cylinder head assembly designed for EFI 170cc and 200cc 4-stroke GY6 engines. This 64mm head assembly comes fully equipped with valves, spark plug, and mounting studs for a comprehensive replacement solution. Precision-engineered to OEM specifications, this cylinder head features robust aluminum construction with optimized cooling fins for efficient heat dissipation. The pre-installed valves and valve springs ensure proper sealing and reliable operation across all RPM ranges. This complete assembly includes all necessary hardware for installation, making it an ideal choice for engine rebuilds or performance upgrades. Perfect for powersports applications, this cylinder head assembly delivers reliable compression and optimal combustion efficiency. Compatible with various GY6-based motorcycles and scooters, this component is manufactured to provide consistent performance and durability. Installation by qualified mechanics is recommended to ensure proper torque specifications and timing adjustments.