... is our 49cc dirt bike or mini pocket bike cylinder 2.bore size:44mm 3.high quality and best ... 4.MOQ:50 pcs. 1.This Cylinder kit also include pistion set,ring.cylinder gasket.2.Bore size is 44mm. ... 80cc(47mm),GY6 50cc cylinder kits(39mm) and GY6 60cc cylinder kits(44mm)3.This Cylinder kit is used for ... as GY6 50cc,GY6 60,GY6 80 ,GY6 150cc, cylinder assy, scooter parts.we have many models for you choose ...