NCY Cylinder Kit, 52mm - GY6 50

NCY GY6 50/QMB139 52mm Cast Iron Cylinder Kit w/o head What a real screamer? Then this 88cc big bore kit for you, although its not a bolt on item for most QMB 139 bikes. Most of the time, engine cases must be cut. Order part number 1400-1001, Engine Bore Tool if there is no access to a machine shop. Its also recommended to get part number 1100-1239, 50mm big valve head as well, as some stock heads will not fit.