NCY Piston Rings (50mm, for 81cc Cylinder Kit); 139QMB black-out the stock caliper must be

the stock caliper must be relocated to clear the larger diameter

offering a perfect balance of sleek aesthetics and rugged utility

and GY6/139QMB powered scooters

NIU Motorcycles Royal Enfield

Engineered for 125cc–170cc air-cooled engines

NCY Piston Rings (50mm, for 81cc Cylinder Kit); 139QMB black-out the stock caliper must beNCY Piston Ring replacement kit for the NCY 50mm piston found in the 81cc big bore cylinder kit. Fits SW part #1100 1237 About NCY: NCY stands as the premier provider of aftermarket performance components for leading scooter brands such as Honda, Yamaha, Genuine, Vespa, Piaggio, SYM, Lance, KYMCO, and GY6 139QMB powered scooters. Established in 1997, NCY adheres to rigorous quality standards and holds ISO 9001 certification. NCY performance parts are