Air Cut Off Valve Rebuild Kits Poor running conditions or popping on deceleration are signs that you may need to rebuild the air cut off valve. All of the necessary parts to rebuild the air cut off valve circuit are included. Kits for vehicles with multiple carburetors include all components for all carburetors. Fits: Yamaha WR250F 2001-2004 2006-2007 2009 2011-2012 WR450F 2003-2007 2009 2011