NCY Cylinder Kit 4T (81cc, Iron, 50mm); 139QMB chain All remaining gaskets and O-rings

All remaining gaskets and O-rings fit both Series A and Series B engines

NCY is ISO 9001 certified

A direct OEM-spec replacement for the left half of the engine case on 125cc and 150cc GY6-based scooters

10 Liters (changing)

NCY Cylinder Kit 4T (81cc, Iron, 50mm); 139QMB chain All remaining gaskets and O-ringsNCY GY6 50 139QMB 50mm bore Cast Iron Cylinder Kit w o head. The perfect upgrade for most 4T 139QMB GY6 50 scooters, this bolt on 81cc kit will really give your scooter some go. It is recommended to get part number 1100 1239, 50mm big valve head as well, as most stock heads will not fit. In addition, we really recommend 1100 1250, NCY Performance Camshaft as an amazing complimentary item to this kit. It will allow the kit to perform to its maximum