On this parts fiche the Washer,17.2mm is the most specified component.
The Crf250r 2009 (9) European Direct Sales / Cmf Transmission consists of forty pieces with the Shaft Comp,main being the most expensive.
Some items from this specific schematic: Washer,thrust Inv, Collar,m-4th Gear, Brg,ball Radial 1, Collar,17mm.