The sub assemblies and components that make up this 2nd Air (e18) include this Valve Assy,2nd Air Reed, the most expensive part.
In this schematic the "Bolt Magneto S" is used most often.
twelve components are shown in this Xf650 1998 (w) (e02 E04 E17 E18 E22 E24 E25 E34) / P9 2nd Air (e18) exploded diagram.