GOOFIT 57.4mm Bore Cylinder Kit 150cc Big Bore GY6 Engine Rebuild Kit Cylinder Head Chinese Scooter Cylinder 57.4mm Bore, Non EGR Engine Fit for 4 stroke GY6 150cc scooter 157QMJ engine One week money back guarantee if not satisfied Arrival within 1-2 days (Sold by GOOFIT and Fulfilled by Amazon) Arrival within 7-15 days (Ships from and sold by GOOFIT)