Mercury 39 runs rough

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  • August 21, 2022 at 1:36 pm #264639
    huntleybill
    Participant

      Seems this motor only runs when the choke is on or partially on. I would like to clean the carb as this motor has been sitting a long time. In order to get the carb off, does the power head need to be pulled? I don’t see how to get the carb off any other way. Am I wrong?

      Thank you for your help.

      Bill

       

      August 21, 2022 at 1:44 pm #264641
      billw
      Participant

        US Member

        The back side of the carb mounting flange is relieved a bit, to allow the carb to be tilted/pivited out. To get the choke out of the way, hold the choke arm forward and push in on the choke knob. It is spring loaded. While pushing in, turn the knob 90 degrees and then pull it out of the lower cowl. Even with all this, I didn’t say it is easy….but yes, it CAN be done without removing the power head. It does sound like that’s what you need. Although, if you pull the idle tube out of it (Under the diagonal facing plug on the top side of the carb) you might be able to just clean out that tube and try it again.

        Long live American manufacturing!

        August 21, 2022 at 2:45 pm #264649
        huntleybill
        Participant

          Thank you Bill. I did clean the brass tube I removed from the top of the carb (see attached pic) but that did not solve the issue! So, I guess I’m going in!

           

           

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          August 21, 2022 at 4:32 pm #264654
          dave-bernard
          Participant

            US Member

            change the fuel pump to the large check valve pump

            August 21, 2022 at 7:54 pm #264676
            huntleybill
            Participant

              Dave: do you have a link or part number for that pump? Is that my issue or does the carb just need cleaning?

              August 22, 2022 at 7:23 am #264710
              dave-bernard
              Participant

                US Member

                carb needs cleaning I just added the pump while you are there. it is from a latter small merc up to 20 hp.

                August 22, 2022 at 4:37 pm #264738
                billw
                Participant

                  US Member

                  Too bad just the idle tube didn’t do it. That one is really easy to get.

                  Long live American manufacturing!

                  August 22, 2022 at 8:50 pm #264757
                  huntleybill
                  Participant

                    No Bill, it didn’t. I took the power head off, threw the carb in the sonic cleaner and now it runs fine. On to the next motor!

                    August 23, 2022 at 6:08 am #264770
                    billw
                    Participant

                      US Member

                      Just for the record, those carbs really will come off without removing the power head.

                      Long live American manufacturing!

                      August 23, 2022 at 1:45 pm #264802
                      crosbyman
                      Participant

                        Canada Member

                        deleted …seems you fixed it ..:-)

                         

                         

                         

                        Joining AOMCI has priviledges 🙂

                        • This reply was modified 3 years, 5 months ago by crosbyman.
                        • This reply was modified 3 years, 5 months ago by crosbyman.
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