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  • Derby cover still leaking

    I've tried several covers in recent years, seems black silicone works best, but its hard to remove. What's a good choice That seals well and is easy to remove?
    An armed man is a citizen, an unarmed man is a subject!
    When motorcycles are outlawed, only outlaws will have motorcycles.
    Keith

  • #2
    Is the outer primary not straight???
    My Website: www.amcpchoppers.com

    sigpic:

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    • #3
      Curious...you do have seal washers for the derby cover screws?
      Not what you expect from this forum
      Forum fucktard
      Winner of the Asshole thread...

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      • #4
        Originally posted by chopprs View Post
        Is the outer primary not straight???
        Not sure how to check this or how to get it true.

        An armed man is a citizen, an unarmed man is a subject!
        When motorcycles are outlawed, only outlaws will have motorcycles.
        Keith

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        • #5
          Originally posted by Bone Head View Post
          Curious...you do have seal washers for the derby cover screws?
          yes, and its the third cover. I have tried a sheet of fine sandpaper on a marble slab for the covers.

          An armed man is a citizen, an unarmed man is a subject!
          When motorcycles are outlawed, only outlaws will have motorcycles.
          Keith

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          • #6
            Set the cover on a flat plate to be sure it is true/flat. A piece of glass will work in a pinch. Then set the cover on the window in the primary with no gasket material and all clean. Does it rock or move at all? Any space between the Derby and Outer anywhere?
            My Website: www.amcpchoppers.com

            sigpic:

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            • #7
              is yours a flat derbey cover or a domed ? i always had trouble with the flat style warping.
              my new primary cover uses the O-ring . it's the way to go .
              http://s715.photobucket.com/user/sho...003-3.jpg.html

              81 fxs-96" S&S bottom- STD dual plug heads- V-thunder 4050 cam- JIMS Powerglides- S&S G with T-JET- DYNA 2000 i- BDL competitor clutch

              2015 rk

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              • #8
                Got a H-D gasket yesterday. Found another domed cover in the stash. Worked it across the granite scrap with Emory cloth. If it quits raining today we shall see
                Last edited by hoginedgewood; 09-21-2020, 12:36 PM.
                An armed man is a citizen, an unarmed man is a subject!
                When motorcycles are outlawed, only outlaws will have motorcycles.
                Keith

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                • #9
                  I've read that if the bike goes down on the left side with any force the primary cover gets deformed and the derby won't seal after that.

                  Tom
                  '84 FXE

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                  • #10
                    Originally posted by 84 Shovel View Post
                    I've read that if the bike goes down on the left side with any force the primary cover gets deformed and the derby won't seal after that.

                    Tom
                    That appears to be my problem. OEM HD Primary, can it be straightened or just use extra sealer on the gasket?

                    IMG_1981.JPG
                    Location: SE Connecticut
                    1982 FXR - started restoration
                    1979 FXS 1200 (1340) - almost done
                    Self Built 96" Evo Softail Chopper
                    2012 103" Road King - "per diem"
                    plus 12 other bikes over the years...

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                    • #11
                      Originally posted by joe s View Post

                      That appears to be my problem. OEM HD Primary, can it be straightened or just use extra sealer on the gasket.
                      Maybe administer some gentle beatings then judge the results by fitting the derby with some modeling clay on the lower area to judge the gap? Diecast Aluminum is fairly brittle so be careful. Maybe make your own gasket out of some closed cell foam and leave the primary cover alone? At work we use some stuff called Mortite for checking clearances.

                      Tom
                      Last edited by 84 Shovel; 09-17-2020, 01:43 PM.
                      '84 FXE

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                      • #12
                        ...I would replace it before it made me want to stab myself!
                        My Website: www.amcpchoppers.com

                        sigpic:

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                        • #13
                          Not wanting to risk cracking the aluminum, I adjusted the derby cover with a 2-lb sledge hammer. I'll give it a good run tomorrow.

                          IMG_1990.JPG
                          Location: SE Connecticut
                          1982 FXR - started restoration
                          1979 FXS 1200 (1340) - almost done
                          Self Built 96" Evo Softail Chopper
                          2012 103" Road King - "per diem"
                          plus 12 other bikes over the years...

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                          • #14
                            ...ingenious!!!
                            My Website: www.amcpchoppers.com

                            sigpic:

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                            • #15
                              Hawg always recommended Hylomar. I've used that many times with great results.
                              Greg
                              84fxsb
                              the "Atomic City", oHIo

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