Supply kinds of GY6 50cc(139qmb) engine parts such as spark plug. You can get more information after contact. Supply kinds of ... GY6 50cc(139qmb) engine parts such as spark plug. You can get more information after contact. GY6 engine is ... , piston, piston ring, valves, camshaft, crankshaft, timing chain, bearing, side cover, transmission system, gasket and other engine parts.2. We can ...