Parts such as the E-4: Pin,dowel,8x12, Spring,cam Chain, Pin,dowel,8x12, Roller Comp,cam C are included in the Z50j Monkey 2006 (6) Japan Ab27-170 E-4 parts fiche.
Check out any of the twenty-one E-4 components enlisted.
This E-4 assembly utilises two Bolt Knock 5mm(s) - the highest specified component.