1.GY6 Big bore cylinder kit 50mm 2.Eight years' experience. 3.High performance is also available 4.OEM service We Brocin can ... 80cc 100cc 125cc 150cc,250cc,300ccSpare parts showgy6 cyclinder kit, gy6 cylinder head,gy6 CVT belt,gy6 carburetor,gy6 camshaft,gy6 ... etc.Supply all kinds of engine parts, such as cylinder head kit, cylinder block kit, piston set, piston ring set, magneto, clutch, starter ...