Features: The most advanced variable rate throttle in the world Innovative reel changing system lets you tailor the throttle rate to riding conditions and rider preference Ultra-compact housing with snap-together elbows make it easy to install and change reels Sleek design requires less handlebar space for lever clearance and throttle position Use smaller reels for slower throttle rate and larger reels for faster throttle rate Included cam reel provides progressive throttle response preferred by some riders Unique reel design allows fast reel changes Cable boot keeps dirt and dust out for reliable and smooth operation Billet aluminum inline cable adjusters for easy installation and adjustment Lower section of cables use 5 mm housing with PTFE liner for reduced friction, increased routing flexibility and lighter weight Upper section of cables use 6 mm housing to provide solid support of adjusters Includes Rev2* throttle assembly with throttle tube Includes Motion Pro Rev2* black vinyl cables specifically designed for your bike, replacement cables listed are not intended for use with stock throttle assemblies Includes 35mm, 40mm, 45mm and 50mm reels Street/Road Race kits include Motion Pro RoadControl* grips Fitment Yamaha WR250F 2003 Yamaha WR250F 2004 Yamaha WR250F 2005 Yamaha WR250F 2006 Yamaha WR250F 2007 Yamaha WR250F 2008 Yamaha WR250F 2009 Yamaha WR250F 2011 Yamaha WR250F 2012 Yamaha WR250F 2013 Yamaha WR450F 2003 Yamaha WR450F 2004 Yamaha WR450F 2005 Yamaha WR450F 2006 Yamaha WR450F 2007 Yamaha WR450F 2008 Yamaha WR450F 2009 Yamaha WR450F 2011 Yamaha YZ250F 2003 Yamaha YZ250F 2004 Yamaha YZ250F 2005 Yamaha YZ250F 2006 Yamaha YZ250F 2007 Yamaha YZ250F 2008 Yamaha YZ250F 2009 Yamaha YZ250F 2010 Yamaha YZ250F 2011 Yamaha YZ250F 2012 Yamaha YZ250F 2013 Yamaha YZ450F 2003 Yamaha YZ450F 2004 Yamaha YZ450F 2005 Yamaha YZ450F 2006 Yamaha YZ450F 2007 Yamaha YZ450F 2008 Yamaha YZ450F 2009