Wiseco 67.5mm Forged Big bore kit for the dohc CB900F. 985cc.The Kit consistsof 4 complete Piston assemblies, Pistons,Rings , Gudgeon Pins and Circlips. Head gaskets are available separately. The 985 kit is a straight rebore of the original cylinder. see our other listings for more Wiseco piston kits and spares.