The Signal Generator assembly is constructed from several parts from which the Igniter is the most expensive.
The most reasonably priced component used on the Gsxr1100 1989 (k) (e01 E02 E04 15 16 17 18 21 22 24 25 34 39 53) Signal Generator is the Screw.
This schematic depicts all components used in the Gsxr1100 1989 (k) (e01 E02 E04 15 16 17 18 21 22 24 25 34 39 53) Signal Generator partslist.