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Thread: Airhead gas tank will not unlock correctly. Locking mechanism broken in Cap,

  1. #1

    Arrow Airhead gas tank will not unlock correctly. Locking mechanism broken in Cap,

    Since running out of gas through an inability to fill the tank is not a serious option, does anyone have any experience of this error in a forty -year old Beemer airhead, and have any suggestions of things to try to remove the old cap and replace, or alternatively to fix this error?

  2. #2
    Registered User
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    i have a 72 /5 toaster tank and replaced the tank cap with a chrome locking type that i was able to have keyed to match the fork lock
    you should be able to remove the hing pin on the old cap to get it off
    it is a split spring kind of affair
    at least it was on mine
    you should be able to tap it out with a narrow punch
    good luck

  3. #3
    Registered User 6322's Avatar
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    More info regarding your airhead as different years have different caps.
    Gary Phillips - #6322
    Wildland Firefighter, Retired, Riggins, ID
    Heartland Moto Locos BMW Riders
    '77 R100/7 Dirt Hack, '83 R80ST, '85 K100RS w/EML, '00 R1100RS

  4. #4
    #4869 DennisDarrow's Avatar
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    I put /7 tank on my /6...both airheads....anyway, that tank came with the screw on type of gas cap. If I closed it tightly...WATCH OUT!!!....The only way I found of getting it off was to put something through the hoop of the handle and pull UP and unscrew as hard as I could......NEVER TO TIGHTEN IT AGAIN for over the next 100K that I had that bike......Someplace, probably Snowbum, I read a cure of drilling a certain size hole and doing something else to surefire fix this.....GOOD LUCK and God bless.....Dennis

  5. #5

    Tku, yes it is a 1982 R100/7 Beemer, well loved and looked after.

    Quote Originally Posted by 6322 View Post
    More info regarding your airhead as different years have different caps.
    1982 R100/7 well looked after.
    Later this afternnon the cap released. and now I am headed to the gas station.
    But I am afeared to put a defective cap back in tight. Any other input most appreciated!

  6. #6
    Quote Originally Posted by benbag View Post
    1982 R100/7 well looked after.
    Later this afternnon the cap released. and now I am headed to the gas station.
    But I am afeared to put a defective cap back in tight. Any other input most appreciated!
    Once in a while I buff the gas cap threads on the cap and tank and give them a coat of anti-seize paste. I also put some penetrating oil down the keyway and the crack between the lock and the cap and work the locking mechanism. It seems to help avoid stuck gas cap syndrome.

  7. #7
    Sir Darby Darryl Cainey's Avatar
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    Having been in the same situation with a spinning gas cap I never tighten mine down till it clicks. I followed Snowbums advice and put in a locking screw.
    The alternative is to buy a new expensive cap.
    Ambassador Emeritus BMW MOA Ontario Canada
    Niagara Riders
    Knights of the Roundel #333
    1977 R100RS, (Retired) 1993 R100GS

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