What is this part? Cushion 21215-49001

[Nspadea]

Looking at the 1980 GS1100E Clutch diagram, Part # 31 21215-49001 labeled "cushion". Can anyone explain what this is and where it goes? I removed my entire clutch basket and I didn't find that part anywhere as far as I know.

[Runningdog]

Looks like it goes on the oil pump gear.

[rphillips]

On the back side, on the center ring of the hub, there are 2 little slots (notches or detents) that go against 2 dogs on the oil pump gear. I've never known why, but only 1 of those slots has a hole for that tiny cushion. Never figured why or what it does, it doesn't seem to stick out enough to do anything. I have an after mkt. heavy duty hub that don't have the hole for a cushion. Hope somebody tells what it does or is supposed to do.

[GregT]

Noise damper. Production tolerances mean that the occasional gear pair might whine. Aftermarket you wouldn't care. Bike is probably noisier than stock anyway.