twenty-two components are listed in the schematic for this F12mx 1973 Ignition ('74 Kx 450) .
On this parts fiche the Washer-spring,4mm is the most specified component.
Some items from this specific schematic: Washer-spring,4mm, Washer-spring,5mm, Spark Plug,b9hs1.0,b9hs1, Spring-spark Plug Cap.