With a quantity of two pieces, the Spring,brush is the most used part in the STARTING MOTOR diagram.
Some items from this specific schematic: O Ring(d:3,id:24.5), Motor Assembly,starting, O Ring, Armature.
The most reasonably priced component used on the Gsx600f 1991 (m) (e01 E02 E04 E15 E16 17 18 21 22 24 25 34 39 53 Starting Motor is the O Ring(d:3,id:24.5).