Gas cap rebuild

[JohninTexas]

Hello,
Has anyone tried to replace/rebuild the rubber gasket on the gas cap? Mine is an '81 GS850L and the gasket has all but crumbled off. It will leak gas on a full tank.

I tried a lot of searches, but failed to find one to match. Any help will be appreciated. Thanks

[DimitriT]

Hello,
Has anyone tried to replace/rebuild the rubber gasket on the gas cap? Mine is an '81 GS850L and the gasket has all but crumbled off. It will leak gas on a full tank.

I tried a lot of searches, but failed to find one to match. Any help will be appreciated. Thanks

Depending on your model that rubber gasket may not come separate from the
entire gas cap assembly.

This was the case for my '82 550L.

What I did was get a piece of rubber gasket material (cork will probably work too)
and cut out a ring which will fit over the existing gasket. I then used a little gas
resistant sealer to bond it on the old gasket.

But the problem you describe could also be caused by a blocked up vent hole in the
cap or in the filler neck.

[bwringer]

You could also get a new gas cap and transplant the guts of the key mechanism so your old key will continue to work.

The gasket is not available separately, unfortunately, and it is not a flat shape that would be easy enough to fabricate.

[JohninTexas]

I pulled it apart, easy to do by taking off the back, and found that there was also a metal fingered ring behind it. I guess it's to apply pressure to the ring. My rubber part is all but gone.

A new cap and tranferring parts is going in the wrong direction in my thinking, although I already have to have two seperate keys due to an igition replacement.

Looks like I will need to "engineer" something.

[Adler]

Looking at my gasket, it looks like it may be possible to simply cut away (or maybe it could even be left) the flat area and glue on a new rubber disc. I think that is what I will try when I have time.