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Harley JD Gas caps...

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  • Harley JD Gas caps...

    Hi All- looking for info about JD gas caps, in particular the vent holes. Were they in different places over the years- on the side, in the top, etc? Thanks in advance.
    Dan Margolien
    Yankee Chapter National Meet July 31/August 1 2020 at the TERRYVILLE Fairgounds, Terryville CT.
    Www.yankeechapter.org
    Pocketvalve@gmail.com

  • #2
    Dear Dan, I've always reckoned the JD gas caps had vent holes in the top and were fitted with leather washers under them, while the VL gas caps had side vent holes and no washers. I guess it was to stop rain water coming through the gas caps and pitting the bottom of the tanks. We should not put washers under the side vented caps. Note, for instance, that the 1931 parts book says part number 3509-16, tank cap washer, is used 1916-29.

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