This is a brand new 20045-2009 YFZ450 fuel air mixture screw
This is the EASIEST and quickest way to adjust your fuel/air mixture ratio
No tools needed – adjust on the fly, right on the trails or track!
This includes the mixture screw, as well as the washer, o-ring, and holder spring
fits any year YFZ450 CARB MODEL 2004 2005 2006 2007 2008 2009 04 05 06 07 08 09
Fits the stock FCR carb
Will not fit the fuel injected 450r or 450x models