Mystery part

[Skinner]

I'm reassembling the master cylinders for my 1981 650GL and have a mystery part remaining.

The mystery part:


It was with the pile of parts from the rear master cylinder but "could" belong to the front master, or maybe even the callipers. I was working and got distracted, dropped the part and put it back on the bench without realizing which pile it came from. It looks like it may fit into the end of the spring that goes into the cylinder, but none of the fiche drawings show that part. Can anybody help?

Thanks!
K

[Agemax]

its a dust cap for the bleed nipple

[Skinner]

Aha! That makes sense - the front calipers did not have one but the rear did.

Thanks!
K

[chuck hahn]

Agemax hit the nail on the head

[bwringer]

This is a good example of why you should include something common for scale when posting pics of mystery parts.

For some reason, my weird brain thought that thing was about an inch across, and I was utterly baffled. A penny in the photo would have been helpful...

[Skinner]

This is a good example of why you should include something common for scale when posting pics of mystery parts.

For some reason, my weird brain thought that thing was about an inch across, and I was utterly baffled. A penny in the photo would have been helpful...

Good call. I'll do that from now on.