Kibblewhite Precision 10-SB250 Valve Seat for Titanium Valve

Head Diameter: 25mm.
O.D.: .984in.
I.D.: .669in.
Height: .355in.
All years of the Yamaha YZ/WR250F are 5-valve engines using three intake seats and two exhaust seats.

Copper-based material designed specifically for use with titanium valves in high performance applications. Gives the seat excellent thermal characteristics as well as resistance to corrosion and wear. These seats are the result of a two year KPMI R&D effort during which we recorded and verified results with 4 and 5 valve singles, multi cylinder street bikes, as well as British and European 4-strokes. In each test the wear, thermal conductivity and machinability surpassed the standards we set for success. These seats are used by succsessful builders around the world in all forms of racing. Sold each. Made in the USA.

Vehicle Fitment:

2001-2009 Yamaha WR250F
2011-2013 Yamaha WR250F
2001-2013 Yamaha YZ250F