cylinder kit 72cc for GY6, Kymco 4-stroke, 139QMB/QMA

72cc (47mm) kit for all 50cc 4 stroke Chinese scooters which use the GY6 139QMA/QMB engines and Kymco 4T.
A low cost performance upgrade to stock 50cc engines. Carburettor will need up jetting (approx 10%). Kit is supplied with required top end gaskets, barrel, piston, rings, pin and clips.

Please note: For Sym scooters this kit is only suitable for the GY6 139QMB engine version and not the XS1P139QMB, AV05W or AW05W engine or the Sym Symply 2 models