The lowest price component in this 012 Electric Starting And Ignition parts-list fiche is the Spring Washer 6 Mm.
This schematic depicts all components used in the Mts620 2006 Usa (multistrada 620) 9151-2271c 012 Electric Starting And Ignition partslist.
Some items from this specific schematic: Starting Motor, Idle Gear, Circlip, Engine Starter Gasket.