On this parts fiche the Clip 6041163400 is the most specified component.
This part-list fiche shows all the components that make up the Br250g Bravo 1982/1983 Crankshaft - Piston Br250f/g .
Some items from this specific schematic: Brg,cyl-cal Roller 20g Tm, Gear, Pump Drive, Piston (2nd 0/s 0.50mm), Crank 2.