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  • Other Brass Plug?

    Can anyone tell me what the brass plug is, behind the air/fuel mixture screw, on a carbuetor (specifically, a Mikuni 40mm, but I think it's on virtually all of them) and how I get a replacement?

  • #2
    You don't replace those, it's only there so you take you bike to the dealer lol.

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    • #3
      Reprinted by permission from Mr. Tidy's Tech Tips Re-Jet Procedure Many thanks to "Thor" This is how to change your jet and needle, for an

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      • #4
        Apparently. I can't even find it on a schematic.

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        • #5
          If you’re looking for the blind plug that covers the idle mixture screw the part number is 3F9-14118-00-00


          They’re in place because EPA sez so. I have yet to see one residing in there as they are pried out, once found.


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          • #6
            Not that one, the one behind it.

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            • #7
              Why do you ask? Those plugs are swedged in there pretty good and not to be removed.

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              • #8
                I'm guessing someone removed it or it fell out. I bought this bike after sitting for a few years. After cleaning the tank and carb, it still wouldn't run right. While adjusting the PMS, I noticed fuel leaking from this hole. I filled it with hi-temp silicone and now, it runs great. I am hoping for a more permanent fix, though (without replacing the carb).

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                • #9
                  Yes. Somebody screwed up and drilled the wrong plug.
                  When machining the carb casting, it's necessary to make holes in order to make other holes, or to make a threaded hole to be able to hold the carb while machining it.
                  The hole in question, is one of those hole used to make another hole, and then it is plugged. It happens from time to time...as it did with your carb.....that peoples abilities to read and comprehend....or worse yet, to try and comprehend without reading, can and does result in exactly what you discovered.

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                  • #10
                    If it's the plug between the PMS and the float bowl, you do not want to remove it. I beleave it's for the port passages and there is no adjustments.
                    If you have removed it by drilling a hole in it, then you will want to solder the the hole back up and reinstall it back into the carb.

                    Sorry, you said it wasn't in there. You will want to clean out the silicone, then find lead shot that will fit in there tight by tapping it into place. Make sure you don't block any passages.

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                    • #11
                      There in lies my problem. I don't have the plug and cannot find a replacement. Is there something you would recommend me using (other than silicone) to permanently plug it?

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                      • roadiemort
                        roadiemort commented
                        Editing a comment
                        Lol, life is so much easier when you tell the whole story, you would not be the first person to drill the wrong plug.

                    • #12
                      Have one made

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                      • #13
                        DocV posted about some stuff from Harbor Freight, for soldering aluminum. I can't remember what it was called. A member had gotten to aggressive removing a bowl screw, and put a big slice in the side of the carb bowl. This stuff fixed it right up.
                        Hopefully the WWW gods are watching, and a link will magically appear.

                        Alla Peanutbutter and jelly sammiches...POOOF!!!!!
                        https://www.roadstarclinic.com/forum...bone-head-move

                        If you do this, remove the PMS and it's respective washer. spring, and oring to prevent damaging them.

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                        • #14
                          Lead 00 buck shot pellet, or one that’ll fill the bill.

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                          • #15
                            Use a 357 or a 38 bullet buy cutting it off at the bottom about 1/4". Don't drive it all the way in.
                            ????

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                            • #16
                               

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                              • #17
                                 

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                                • #18
                                  These homemade lead plug ideas, are very workable. You can flatten either the 00 buck, or a .38 bullet, until it can be snuggly tapped in.

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                                  • #19
                                    There is a screw behind that one for tge dark matter propulsion. Carefull as you can achieve speeds that will melt your skin off.

                                    I kid i kid. I dont know whats behind it.
                                    my Wallet is Getting dangerously close to spontaneous combustion

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                                    • #20
                                      Since it's not a replaceable part I don't think you'll find a part number for it. It would be cheaper to buy a mini lathe at Harbor Freight and make your own.
                                      Manuals, Roadwing, other stuff
                                      PGR
                                      PGT MT

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