Features: 1.The diameter of cylinder is 47mm, and the length of cylinder head valve is 64mm 2.Made of high quality Aluminum alloy and durable in use 3.Original standard, direct replacement for the original one 4.Precise design, high performance and reliable stability 5.Especially designed for GY6 72cc 80cc 4 Stroke 139QMB/139QMA Specification: Feature:_x000D_ _x000D_ The diameter of cylinder is 47mm, and the length of cylinder head valve is 64mm. _x000D_ Made of high quality Aluminum alloy and durable in use. _x000D_ Original standard, direct replacement for the original one. _x000D_ Precise design, high performance and reliable stability. _x000D_ Especially designed for GY6 72cc 80cc 4 Stroke 139QMB/139QMA. _x000D_ _x000D_ Specification:_x000D_ Condition: Brand new_x000D_ Material: Aluminum alloy_x000D_ Color: Silver_x000D_ Package Weight: Approx 996g_x000D_ Cylinder Quantity: 1_x000D_ Displacement: 80cc_x000D_ Cylinder Head Valve Length: Approx 64mm/2.52in_x000D_ Cylinder Diameter: Approx 47mm/1.85in_x000D_ _x000D_ Package Include:_x000D_ 1 * Engine Cylinder Head assembly_x000D_ _x000D_ Note:_x000D_ 1. This is a non-EGR head, it does not have EGR port._x000D_ 2. Please check the size before purchasing._x000D_ 3. Please allow 1-3cm error due to manual measurement. Thanks for your understanding._x000D_ 4. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. PackageList: