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The Camshaft Exhaust Stage 1 System is part of the latest collection from Hot Cams.. Features: Stage 2 is designed for mid to top end gains. Adds a 5%-10% power gain. Designed and dyno proven in the USA. Manufactured by utilizing state of the art valvetrain software. CNC machined from 8620 billet, case-hardened steel for an exact fit and lobe profile. Engineered to be drop-in cams, that use stock valve springs (unless otherwise noted).. Select cams feature Hot Cams Improved Throttle Design (ITR) technology; these cams improve throttle response throughout the entire rpm range while providing excellent power gains through the mid-range and top-end.. For dual cam engine.. Top end power increase and improved over rev. Includes auto-decompression mechanism. Exhaust Valve Lash: 0.200 mm.. Specifications: Application: Exhaust. Exhaust Duration: 252�. Exhaust Lift: 8.500 mm. Exhaust Lobe Centerline: 102.500�. Product Name: Camshaft. Type: Stage 2. Units: Each. To fit: YAMAHA WR 250 F 2001 American Models. YAMAHA WR 250 F 2001 European Models. YAMAHA WR 250 F 2002 American Models. YAMAHA WR 250 F 2002 European Models. YAMAHA WR 250 F 2003 American Models. YAMAHA WR 250 F 2003 European Models. YAMAHA WR 250 F 2004 American Models. YAMAHA WR 250 F 2004 European Models. YAMAHA WR 250 F 2005 American Models. YAMAHA WR 250 F 2005 European Models. YAMAHA WR 250 F 2006 American Models. YAMAHA WR 250 F 2006 European Models. YAMAHA WR 250 F 2007 American Models. YAMAHA WR 250 F 2007 European Models. YAMAHA WR 250 F 2008 American Models. YAMAHA WR 250 F 2008 European Models. YAMAHA WR 250 F 2009 American Models. YAMAHA WR 250 F 2009 European Models. YAMAHA WR 250 F 2010 American Models. YAMAHA WR 250 F 2010 European Models. YAMAHA WR 250 F 2011 American Models. YAMAHA WR 250 F 2011 European Models. YAMAHA WR 250 F 2012 American Models. YAMAHA WR 250 F 2012 European Models. YAMAHA WR 250 F 2013 American Models. YAMAHA WR 250 F 2013 European Models. YAMAHA YZ 250 F 2001 American Models. YAMAHA YZ 250 F 2001 European Models. YAMAHA YZ 250 F 2002 American Models. YAMAHA YZ 250 F 2002 European Models. YAMAHA YZ 250 F 2003 American Models. YAMAHA YZ 250 F 2003 European Models. YAMAHA YZ 250 F 2004 American Models. YAMAHA YZ 250 F 2004 European Models. YAMAHA YZ 250 F 2005 American Models. YAMAHA YZ 250 F 2005 European Models. YAMAHA YZ 250 F 2006 50th Anniversary Limited Edition American Models. YAMAHA YZ 250 F 2006 50th Anniversary Limited Edition European Models. YAMAHA YZ 250 F 2006 American Models. YAMAHA YZ 250 F 2006 European Models. YAMAHA YZ 250 F 2007 American Models. YAMAHA YZ 250 F 2007 European Models. YAMAHA YZ 250 F 2008 American Models. YAMAHA YZ 250 F 2008 European Models. YAMAHA YZ 250 F 2009 American Models. YAMAHA YZ 250 F 2009 European Models. YAMAHA YZ 250 F 2010 American Models. YAMAHA YZ 250 F 2010 European Models. YAMAHA YZ 250 F 2011 American Models. YAMAHA YZ 250 F 2011 European Models. YAMAHA YZ 250 F 2012 American Models. YAMAHA YZ 250 F 2012 European Models. YAMAHA YZ 250 F 2013 American Models. YAMAHA YZ 250 F 2013 European Models. Manufacturer part number: 4055-2E. View all Hot Cams. View all Parts and spares..