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Thread: Gas Cap Gaskets

  1. #1
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    Default Gas Cap Gaskets

    Just wondered what material everyone is having the best luck with, with today's fuel? I recently got another bike up and running and decided to try Viton, it swelled up more than the Buna that is in another bike using the same standard pump gas with ethanol. Is anyone using leather or another material with good results? Thanks, Bob
    Bob Rice #6738

  2. #2
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    It can't be real Viton, Bob!

    What color are they? Are they 'branded'?

    (Doh! Viton can be both red and black... but red is certain,.. maybe.)

    Dies are easy to whittle on the lathe, and leather was the standard back in the day (before P4gas).

    ...Cotten
    Last edited by T. Cotten; 09-06-2019 at 11:45 AM.
    AMCA #776
    Dumpster Diver's Motto: Seek,... and Ye Shall Find!

  3. #3
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    Bob , talk to Paul Andrews (Pa, Paps), he was making some replacement gaskets.
    Robbie
    Robbie Knight Amca #2736

  4. #4
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    Quote Originally Posted by Rubone View Post
    Bob , talk to Paul Andrews (Pa, Paps), he was making some replacement gaskets.
    Robbie
    Pa gave me scraps to make top petcock gaskets, Folks!

    Black, but it tested out fine back then...

    What fuel are you running, Bob?

    ....Cotten
    AMCA #776
    Dumpster Diver's Motto: Seek,... and Ye Shall Find!

  5. #5
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    The 'Viton' gaskets I have I purchased at Wauseon from a vendor about 4 years ago. I cannot verify they are Viton but I would want to think I bought what I was told. The gaskets were black. As stated in my first post, I am running just standard pump gas with ethanol. I have been thinking about making some simple punch and dies and buying some Viton. Just wanted to get opinions as to what is working for everyone before I invest in a sheet of Viton. Thanks Robbie I may get in contact with Paul and see if he has any. Thanks, Bob
    Bob Rice #6738

  6. #6
    Join Date
    Oct 2002
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    Default

    What about the leather ones Bob? They work great on my 38. I have plenty of oem ones if you need a set.
    AMCA #765

  7. #7
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    The H-D packaged originals I have are cork. They seem to be to dried out to be usable, but I've heard you can boil them to make them usable.
    Eric Smith
    AMCA #886

  8. #8
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    Nov 2018
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    Lowell,ma
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    Default

    I have added a gasket made from an inner tube to an old, ill fitting original with great success. Just needs a finger load of oil once in a while

  9. #9
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    There would be a lot of good gasket materials, Folks,..

    If only the fuels would cooperate; Beware swelling rubber gaskets can block the vents on some designs of caps, causing overflow or worse.

    Modern cork is bonded composite, so somewhere someday some fuel might eat it. The stuff I get, even the best from Portugal, works as a gasket, but would soon disintegrate under the mechanics of a cap.

    "Fishpaper" is too stiff to get over the bayonet tangs.

    Where's Pa? Not a member?
    I think I have a set of his stashed somewhere....

    ....Cotten
    Last edited by T. Cotten; 09-07-2019 at 12:09 PM.
    AMCA #776
    Dumpster Diver's Motto: Seek,... and Ye Shall Find!

  10. #10
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    Quote Originally Posted by len dowe View Post
    What about the leather ones Bob? They work great on my 38. I have plenty of oem ones if you need a set.
    Len, How thick are the leather ones? Does the smooth or rough side of the leather go against the tank?

    Quote Originally Posted by exeric View Post
    The H-D packaged originals I have are cork. They seem to be to dried out to be usable, but I've heard you can boil them to make them usable.
    Eric, How thick are the cork ones?

    Thanks.
    Bob Rice #6738

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