With the latest v.2 cylinder Kit Series from Naraku, we can victim a more advanced product, as a 4 stroke cylinder is effective just a hole, the emphasis on technological development was placed on the piston and compression, the piston has 2 add 2 Addtition skirt, which collects engine oil to lubricate the cylinder bore and improve characteristics in extreme circumstances, The molybdenum coating aids the crucial running-in period, 2 oil recesses and a groove at each bearing point ensure the gudgeon pin is adequately lubricated, The compression ratio has been specially calibrated to the requirements of everyday running, Naraku ﾒ s high quality and very good power deliveries Cap off this cylinder kit, the kit can be used with the original carburerettor, but we recommended changing the main jet jet Scooters this kit is only suitable for the gy6 Versión del motor 139QMB y no el motor XS1P139QMB, AV05W o AW05W o los modelos Sympsy 2