On this parts fiche the Washer Spline 28x is the most specified component.
Some items from this specific schematic: Gear,m-3 M-4, Washer,20x0.9, Washer,spline,25x, Bearing,needle,20.
This part-list fiche shows all the components that make up the Cb600fa Hornet 2008 (8) European Direct Sales / Abs Transmission .