GOOFIT 47mm Piston Assembly Kit for GY6 80cc Scooter Moped The piston diameter:47mm The piston pin diameter:13mm Piston Assy for GY6 80cc Moped Please confirm that the seller's GOOFIT shop is the owner of the corresponding product. In the unlikely event that you encounter frauds posing as an exhibitor, thank you for letting us report to Amazon. Arrival within 1-2 days (Sold by GOOFIT and Fulfilled by Amazon),Arrival within 7-15 days (Ships from and sold by GOOFIT).