40 mm (1.60″) outside diameter, 30 mm (1.20″) inside diameter Compatible with many 125cc – 250cc GY6 scooters, go-karts, & ATVs Superior durability &longevity Our GY6 exhaust gasket with a 40 mm (1.60″) outside diameter and an inside diameter of 30 mm (1.20″) fits a variety of street-legal, gasoline-powered motor scooters using the ubiquitous GY6 engine These include many models with 125cc up to 250cc displacement enginesDescription Our GY6 exhaust gasket with a 40 mm (1.60″) outside diameter and an inside diameter of 30 mm (1.20″) fits a variety of street-legal, gasoline-powered motor scooters using the ubiquitous GY6 engine. These include many models with 125cc up to 250cc displacement engines. In addition to the scooters, this exhaust gasket may be compatible with many go-karts, ATVs, and other powersports machines using the GY6.The metal composition of these exhaust gaskets provides superior durability and component longevity. ? WARNING California Residents: Pro