QuadBoss Part 420588 Air Cut-Off Valve Kit for Yamaha YFM400 and YFM660R Models

Improperly functioning air cut-off valves can stick open or closed, causing poor running conditions and popping during deceleration. Air Cut-Off Valve Kit includes O-rings, diaphragm, spring and screws necessary to rebuild the air cut-off valve circuit.

• Complete rebuild kit with O-rings, diaphragm, spring, and screws to restore carburetor air cut-off function


• Multi-carb models include components for all carbs; direct OEM replacement for reliable performance


• Fixes sticking valves causing poor idle, popping on deceleration, and lean running conditions


• Models with multiple carburetors include components to repair all carburetors

The QuadBoss Part 420588 Air Cut-Off Valve Kit is designed to restore proper function to the air cut-off system in select Yamaha powersports vehicles. When air cut-off valves stick open or closed, they can cause engine issues such as rough idling, popping during deceleration, and lean running conditions. This comprehensive rebuild kit includes all necessary components—O-rings, diaphragm, spring, and screws—that ensure a complete and reliable repair of the carburetor's air cut-off circuit. Proper installation helps maintain optimal engine performance and fuel efficiency by preventing sticking valves that disrupt airflow regulation. The kit is suitable for multi-carb models, providing components for all carbs involved, making it a convenient solution for vehicles with multiple carburetors. It is a direct OEM replacement, ensuring compatibility and durability, and is ideal for Yamaha models such as the YFM400 Big Bear series and the YFM660R Raptor, spanning model years from 2000 through 2005. Properly functioning air cut-off valves are essential for smooth engine operation and efficient deceleration, and this kit offers an effective way to resolve common issues associated with worn or stuck valves. Whether you're performing routine maintenance or addressing specific performance problems, the QuadBoss Air Cut-Off Valve Kit provides the quality parts necessary for restoring your vehicle’s carburetor function and ensuring reliable operation. This kit is engineered to deliver long-lasting performance and is suitable for most powersports enthusiasts seeking OEM-quality repairs.

Features:

• Complete rebuild kit with O-rings, diaphragm, spring, and screws to restore carburetor air cut-off function

• Includes components for all carbs on multi-carb Yamaha models for comprehensive repair

• Designed to fix sticking valves that cause poor idle, deceleration popping, and lean running conditions

• Direct OEM replacement ensures reliable performance and compatibility

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

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