model:IE42 bore:42mm motorcycle engine/parts/cylinder block We have got ISO9001-2000 for our products. model:IE42bore:42mmmotorcycle engine/parts/ ... excellent wear resistance and good metallograhic structure.3.Clear bore surface cross hatch pattern?good oil-retaining characteristic?resulting ... but also need matched with cylinder of piston ,piston ring, piston pin,gasket,clips,clon, and so on,that ...