GOOFIT Cylinder Head with Valve for 4 Stroke GY6 49cc 50cc Scooter Moped 139QMA 139QMB Engine Part Brand new cylinder head with valves/seals already installed,also fit for 100cc big bore Size:intake valve 18.6 mm,exhaust valve 16 mm Fit for 4 stroke GY6 49cc 50cc Scooter Moped ATV(read description for fitment infos) Arrival within 1-2 days (Sold by GOOFIT and Fulfilled by Amazon) Arrival within 7-15 days (Ships from and sold by GOOFIT)