This is a new Yamaha YFZ450 engine side crankcase oil squirter upgrade kit Includes the oil squirter and the oring aka "oil mod" OEM oil squirter that will fit 2004-2009 carb model yfz450 atvs You will need your cases modified to fit on a 2004, 2005, or 2006 YFZ 450 A MUST HAVE upgrade for the 04-