139 FMB-B and 139 FMB gear shift selection axis, Masai, Orion, Mash, Archive... 50 New gearbox control pedal shaft adaptable for 50cc motorcycle Mash Fifty, Masai, Archive, Motrac... with a vertical 139FMBB 50 4T or horizontal 139FMB 50 4T motor. Gear shift shaft technical characteristics and dimensions