Cylinder Bore:63mm/2.48″ Exhaust Port Diameter:30mm/1.18″;Bolt Hole Spacing:50mm/1.96″.Intake Port Diameter:26mm/1.02″;Intake Port Bolt Hole Spacing:45mm/1.77″ Cylinder kit for GY6 4-Stroke GY6 150cc 180cc 200cc 250cc Engines ATV Off-Road Vehicle Scooter Go Kart Package including:cylinder body,gasket,94 chain,Rocker(as picture show) Warranty:We are always available to help our customers.Please message us for replacement or refund if you are not satisfied with the order pls confirm The size of the product meets your requirements before you purchase Note:please allow 0.5-1 inch difference due to manual measurement.1inch=2.54cm Size: Cylinder Bore:63mm/2.48″ Exhaust Port Diameter:30mm/1.18″ Exhaust Port Bolt Hole Spacing:50mm/1.96″ Intake Port Diameter:26mm/1.02″ Intake Port Bolt Hole Spacing:45mm/1.77″ Replacement for: For 4-Stroke GY6 150cc 180cc 200cc 250cc Engines ATV Off-Road Vehicle Scooter Go Kart Package Included: Cylinder body x 1pc Gasket x 2pcs 94 chain x 1pc Ro