With a quantity of two pieces, the Bolt Knock 5mm is the most used part in the E-4 diagram.
Parts such as the E-4: Pivot, Tensioner, Spindle,cam Chain, Bolt Flange 6x18, Sprocket Comp,cam are included in the Z50j Monkey 2011 (b) Japan Ab27-200 E-4 parts fiche.
The lowest price component in this E-4 parts-list fiche is the Bolt Flange 6x18.