The BOYESEN WPK-38B Black Water Pump Cover & Impeller Kit is designed for increased coolant flow across all RPM ranges. Its patented Nautilus-style impeller supports hydrodynamic efficiency, while the two-piece cast aluminum construction provides the core structure for the assembly. An integrated oil filter access design allows for hassle-free filter changes.
This kit fits 2001–2002 Yamaha WR426F, 2000–2002 Yamaha YZ426F, and 2004–2008 Yamaha YFZ450 models. The manufacturer part number is WPK-38B. Vendor part number: 59-8622B.
Features:
- Construction: Two-piece cast aluminum construction
- Oil Filter Access: Allows hassle-free oil filter changes
- Coolant Flow: Increased coolant flow at all RPM ranges
- Impeller Design: Patented Nautilus-style impeller for hydrodynamic efficiency
- Color: Black
- Fitment: Fits 2001–2002 Yamaha WR426F, 2000–2002 Yamaha YZ426F, and 2004–2008 Yamaha YFZ450
Fitment:
2000 Yamaha YZ426F
2001 Yamaha WR426F
2001 Yamaha YZ426F
2002 Yamaha WR426F
2002 Yamaha YZ426F
2003 Yamaha WR450F
2003 Yamaha YZ450F
2004 Yamaha WR450F
2004 Yamaha YFZ450
2004 Yamaha YZ450F
2005 Yamaha WR450F
2005 Yamaha YFZ450
2005 Yamaha YZ450F
2006 Yamaha WR450F
2006 Yamaha YFZ450
2006 Yamaha YFZ450 Bill Balance Edition
2006 Yamaha YZ450F
2007 Yamaha WR450F
2007 Yamaha YFZ450
2007 Yamaha YFZ450 Bill Balance Edition
2007 Yamaha YFZ450 SE
2007 Yamaha YZ450F
2008 Yamaha WR450F
2008 Yamaha YFZ450
2008 Yamaha YFZ450 SE
2008 Yamaha YZ450F
2009 Yamaha WR450F
2009 Yamaha YFZ450
2009 Yamaha YZ450F
2010 Yamaha WR450F
2011 Yamaha WR450F
2012 Yamaha WR450F
2012 Yamaha YFZ450
2013 Yamaha WR450F
2013 Yamaha YFZ450
2014 Yamaha WR450F
2015 Yamaha WR450F