39mm Cylinder Head 64mm Valves Replacement for 4 Stroke GY6 49cc 50cc ATV Scooter Moped 139QMA 139QMB Engine

Replacement for 49cc 50cc 4 Stroke Scooter. Size: Distance between mounting holes: 50 mm/2.0 inches; Intake valve diameter: 18.6 mm/0.73 inches; Exhaust valve diameter: 16 mm/0.63 inches; Valve length: 64 mm/2.5 inches. Easy to install. High quality cylinder replacement part. High toughness, corrosion resistance, anti-rust and durable. Has a good heat dissipation structure design, providing reliable performance and long service life. Please check the model number and size before ordering to make sure it is the right part.