The QuadBoss Air Cut-Off Valve Kit is designed to restore optimal performance in Yamaha YFM400 Big Bear and YFM660R Raptor models from 2000 to 2005. Over time, improperly functioning air cut-off valves can stick open or closed, leading to poor engine running conditions and popping sounds during deceleration. This comprehensive rebuild kit includes all necessary components such as O-rings, diaphragm, spring, and screws to repair the air cut-off valve circuit effectively. Whether your machine has single or multiple carburetors, this kit provides the precise parts needed for a complete overhaul, ensuring smooth throttle response and engine operation. Proper maintenance of the air cut-off valve circuit is critical for maintaining fuel efficiency and preventing engine issues that stem from air passage disruptions. The kit’s components are engineered to fit specific Yamaha models, making installation straightforward and reliable for both DIY enthusiasts and professional technicians. Restoring the function of your air cut-off valves will help maintain optimal engine performance, reduce emissions, and extend the lifespan of your powersports vehicle. Trust the QuadBoss brand for quality parts designed to meet or exceed OEM standards, ensuring your Yamaha runs smoothly and efficiently. This kit is a must-have for anyone looking to keep their Yamaha YFM400 or YFM660R in peak condition and ready for the trail or worksite.

Features:

• Complete rebuild kit including O-rings, diaphragm, spring, and screws

• Designed for Yamaha YFM400 Big Bear and YFM660R Raptor models from 2000 to 2005

• Suitable for models with single or multiple carburetors

• Engineered to restore proper air cut-off valve operation

• Helps improve engine response, fuel efficiency, and emissions

Fitment:
2000 Yamaha YFM400 Big Bear 2x4 Base
2000 Yamaha YFM400 Big Bear 4x4 Base
2001 Yamaha YFM400 Big Bear 2x4 Base
2001 Yamaha YFM400 Big Bear 4x4 Base
2001 Yamaha YFM400F Kodiak 4x4 Base
2001 Yamaha YFM660R Raptor Base
2002 Yamaha YFM400 Big Bear 2x4 Base
2002 Yamaha YFM400 Big Bear 4x4 Base
2002 Yamaha YFM400F Kodiak 4x4 Base
2002 Yamaha YFM660R Raptor Base
2003 Yamaha YFM400 Big Bear 2x4 Base
2003 Yamaha YFM400 Big Bear 4x4 Base
2003 Yamaha YFM660R Raptor Base
2004 Yamaha YFM400 Big Bear 2x4 Base
2004 Yamaha YFM400 Big Bear 4x4 Base
2004 Yamaha YFM660R Raptor Base
2005 Yamaha YFM400 Big Bear 4x4 Base
2005 Yamaha YFM660R Raptor Base
2006 Yamaha YFM400 Big Bear 4x4 Base
2007 Yamaha YFM250 Big Bear Base
2007 Yamaha YFM350 Grizzly IRS 4x4 Auto Base
2007 Yamaha YFM400 Big Bear IRS 4x4 Base
2008 Yamaha YFM250 Big Bear Base
2008 Yamaha YFM350 Grizzly IRS 4x4 Auto Base
2008 Yamaha YFM400 Big Bear IRS 4x4 Base
2009 Yamaha YFM250 Big Bear Base
2009 Yamaha YFM350 Grizzly IRS 4x4 Auto Base
2009 Yamaha YFM400 Big Bear IRS 4x4 Base
2010 Yamaha YFM350 Grizzly IRS 4x4 Auto Base
2010 Yamaha YFM400 Big Bear IRS 4x4 Base
2011 Yamaha YFM350 Grizzly IRS 4x4 Auto Base
2011 Yamaha YFM400 Big Bear IRS 4x4 Base
2012 Yamaha YFM400 Big Bear IRS 4x4 Base