ITEM DESCRIPTION: High Quality, 80cc Big Bore Kit, 47mm bore, 13mm wrist pin used to increase the size of a GY6 50cc engine to 80cc. The GY6 engine is found on various Scooters & some ATVs.

NOTE: This is a very high-quality kit made by TwLP (Taiwan Laser Parts). 

NOTE: This kit can use the stock 50cc head, however, for the best performance use a 47 or 50mm head which I have in another listing.