GY6 49cc 50cc 125cc 150cc Exhaust Muffler Pipe Gasket 30mm Scooter Moped MG04 Exhaust Muffler (Pipe) Gasket for QMB139 4-stroke 50cc, GY6 4-stroke 125cc and 150cc engines. Inner Diameter: 23mm Outer Diameter: 30mm This gasket fits most Scooters/Mopeds with 50cc to 150cc Engines and will fit other models of ATVs, Go-Karts, Dirt Bikes, and Motorcycles. Condition: Brand new