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Rubber vacuum caps vs. vinyl?

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  • Rubber vacuum caps vs. vinyl?

    The rubber caps keep cracking and allowing vacuum leaks, and all I had left was some vinyl ones. Does anyone know if they stand up to heat better? They look goofy seeing as how they are colored, but right now they are serving their purpose. If they prove a better fix, I might just leave them on.
    Richard
    '79 XS1100SF "Phantom Stranger" full fairing w/radio and cd player, H-D Roadking trunk, everything else stock
    '02 Honda VTX1800C

  • #2
    Yep, I got a few of those vinyl caps on now, they do seem to last much longer than the rubber type.
    2H7 (79)
    3H3

    "If it ain't broke, modify it"

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    • #3
      Even better would probably be viton ones if you can find them. The higher quality ones you can find the better off you will be as well, as the cheaper ones will not last as long. But they are just one of those things that you often have to change on a regular basis. So far I have had to do mine about every 2 years.

      And the last set I had to peel off in pieces.
      Cy

      1980 XS1100G (Brutus) w/81H Engine
      Duplicolor Mirage Paint Job (Purple/Green)
      Vetter Windjammer IV
      Vetter hard bags & Trunk
      OEM Luggage Rack
      Jardine Spaghetti 4-2 exhaust system
      Spade Fuse Box
      Turn Signal Auto Cancel Mod
      750 FD Mod
      TC Spin on Oil Filter Adapter (temp removed)
      XJ1100 Front Footpegs
      XJ1100 Shocks

      I was always taught to respect my elders, but it keeps getting harder to find one.

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      • #4
        The big difference I think is how well they withstand heat. Most vinyl doesn't like getting hot, but if the ones you have fitted are holding up, they should be fine...
        Fast, Cheap, Reliable... Pick any two

        '78E original owner - resto project
        '78E ???? owner - Modder project FJ forks, 4-piston calipers F/R, 160/80-16 rear tire
        '82 XJ rebuild project
        '80SG restified, red SOLD
        '79F parts...
        '81H more parts...

        Other current bikes:
        '93 XL1200 Anniversary Sportster 85RWHP
        '86 XL883/1200 Chopper
        '82 XL1000 w/1450cc Buell, Baker 6-speed, in-progress project
        Cage: '13 Mustang GT/CS with a few 'custom' touches
        Yep, can't leave nuthin' alone...

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