The ProX Exhaust Valve and Spring Conversion Kit is designed as a durable replacement for Yamaha YZ250F models originally equipped with titanium exhaust valves. This complete conversion set includes steel exhaust valves and specially engineered valve springs that work with the original equipment retainers, spring bases, and valve seals. The kit provides a practical solution for rebuilding the cylinder head without requiring additional engine modifications.
ProX steel valves are nitrided to provide high surface hardness and a smooth finish that helps reduce friction between the valve stem and guide. The included springs are designed to accommodate the additional weight of steel valves while maintaining reliable valve control at high engine speeds. Manufactured from premium chrome vanadium steel, the springs offer improved strength, performance, and durability under demanding operating conditions.
The ProX part number 28.SES2402-1 is a complete exhaust valve conversion package for quick and efficient service. It is intended for fitment on 2001 through 2010 Yamaha YZ250F motorcycles, including the 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, and 2010 model years. Verify the motorcycle model and engine application before installation. Manufacturer: ProX. Vendor part number: 28.SES2402-1.
Features:
- Durable Steel Valves: Provides increased durability and reduced wear under extreme operating conditions.
- Nitrided Valve Finish: Delivers high microhardness and a smooth surface to help reduce friction between the valve stem and guide.
- Performance Valve Springs: Specially designed stronger springs compensate for the additional weight of the steel valves.
- Chrome Vanadium Construction: Premium chrome vanadium steel supports reliable performance and durability at high RPMs.
- OEM-Compatible Installation: Reuses the original equipment retainers, spring bases, and valve seals without requiring further engine modifications.
- Complete Conversion Package: Includes the required exhaust valves and springs for an efficient cylinder-head rebuild.
- Fitment: Fits 2001-2010 Yamaha YZ250F motorcycles.
- Brand: ProX.
- Manufacturer Part Number: 28.SES2402-1.
- Vendor Part Number: 28.SES2402-1.
Fitment:
2001 Yamaha WR250F
2001 Yamaha YZ250F
2002 Yamaha WR250F
2002 Yamaha YZ250F
2003 Yamaha WR250F
2003 Yamaha YZ250F
2004 Yamaha WR250F
2004 Yamaha YZ250F
2005 Yamaha WR250F
2005 Yamaha YZ250F
2006 Yamaha WR250F
2006 Yamaha YZ250F
2007 Yamaha WR250F
2007 Yamaha YZ250F
2008 Yamaha WR250F
2008 Yamaha YZ250F
2009 Yamaha WR250F
2009 Yamaha YZ250F
2010 Gas-Gas EC 250F
2010 Yamaha WR250F
2010 Yamaha YZ250F
2011 Gas-Gas EC 250F
2011 Yamaha WR250F
2011 Yamaha YZ250F
2012 Gas-Gas EC 250F
2012 Yamaha WR250F
2012 Yamaha YZ250F
2013 Gas-Gas EC 250F
2013 Gas-Gas EC 300
2013 Yamaha WR250F
2013 Yamaha YZ250F
2014 Gas-Gas EC 250F
2014 Gas-Gas EC 300
2015 Gas Gas EC 300
2015 Gas-Gas EC 250F