Cast aluminum construction. Increased coolant flow in all RPM ranges. Patented nautilus-style impeller for hydrodynamic efficiency.
| 2004-2009, 2012-2013 | Yamaha | YFZ 450 4x2 | - | - |
| 2003-2015 | Yamaha | WR 450 F | - | - |
| 2003-2009 | Yamaha | YZ 450 F | - | - |
| 2001-2002 | Yamaha | WR 426 F | - | - |
| 2000-2002 | Yamaha | YZ 426 F |
