NEW CYLINDER BARREL HEAD WITH VALVES. FITS MANY GY6 250cc ENGINES FOUND IN SCOOTERS, ATV'S, QUADS, GO-KARTS, CFMOTO, JONWAY YY250T, AND ROKETA MC-54, MC-13, MC-68A. MUST BE FITTED BY A QUALIFIED MECHANIC. SAVE YOURSELF A EXPENSIVE REBORE WITH THIS BRAND NEW BARREL.