GOOFIT 40mm Bore Cylinder Kit with Piston for 2 Stroke 47cc 49cc Pocket Bike Mini Quad Chain Saw Bore:40mm,exhaust bolt hole spacing:40mm,bolt hole spacing:50mm,piston diameter:12mm This item fits for 2 stroke 43cc 47cc 49cc mini quad pocket bike Package including:cylinder body,piston,piston,gasket,piston ring,clips,piston stud Arrival within 1-2 days (Sold by GOOFIT and Fulfilled by Amazon) Arrival within 7-15 days (Ships from and sold by GOOFIT)