I disconnected the clutch cable from the lever when a plastic piece fell from the lever housing. Any idea where this goes inside the housing? I think it's used to prevent the lever from rattling when the lever is not in use.

 

That's what's left of the anti-rattle spring for the clutch lever. It screws to the bottom of the lever. Look under there and you'll see the screw and the other end of it.

Part# 45021-86. Number 19 in the diagram.

 

Thanks! Great info! I saw the small screw #25 but didn't look closely at it... so I guess it (#19) broke off.