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140 won’t idle correctly

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  • 140 won’t idle correctly

    Good morning! I’ve been running down ignition gremlins and now that I’ve got this licked it seems there could be a fuel problem. (Long story made longer)
    this engine had to have a new crank and #2 piston due to spinning a bearing.So it’s been blown Apart and back together, timing set to 6* and will run if the idle is held up in the 1100-1500 range. When cold starting it will immediately try to run but dies. After that some pretty aggressive feathering of the throttle has to be done to find a happy spot. If you can get it up and running for a minute or two then you can bring the idol down to around 700 to 800 RPM long enough to make timing adjustments throttle adjustments etc. But as it continues to warm up it gets more difficult to keep running. RPMs will start dropping And you have to continually make adjustments to the throttle to keep it going when it does finally die it’s very difficult to restart. There’s a lot of backfiring in sputtering. I’m just not Sure where to start my search it feels like a fuel issue. But why would it only become an issue as the engine continues to warm up?
    It's like Murphy's law, but worse; another T.K.O>

  • #2
    Coming off the choke it is running out of fuel. Needs a carburetor rebuild with particular attention to the idle circuits.
    17 Foot '90 Bluewater
    Alpha 1 3.0 Merc - repowered in 2016
    now - 4.3L Vortec - Alpha 1 GenII
    Honda BF100L kicker
    Engine custom - Transom 0D65328 - Drive 0D648864
    If you ain't fishin, then yer working too much.

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    • #3
      Originally posted by Rick Stephens View Post
      Coming off the choke it is running out of fuel. Needs a carburetor rebuild with particular attention to the idle circuits.
      I don’t use the choke.... not hooked up, never has been. Doesn’t mean you’re wrong tho. This carb has been rebuilt 3 times over the last 10 years and doesn’t have 6 hours on it....
      It's like Murphy's law, but worse; another T.K.O>

      Comment


      • #4
        Originally posted by Rick Stephens View Post
        Coming off the choke it is running out of fuel. Needs a carburetor rebuild with particular attention to the idle circuits.
        I don’t use the choke.... not hooked up, never has been. Doesn’t mean you’re wrong tho. This carb has been rebuilt 3 times over the last 10 years and doesn’t have 6 hours on it....
        It's like Murphy's law, but worse; another T.K.O>

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        • #5
          Doesn’t mean you’re wrong tho. This carb has been rebuilt 3 times over the last 10 years
          Ayuh,.... The choke richins the mix, yer motor says it's to lean,......

          Ya mean somebody tried to rebuild the carb 3 times already,..??

          Even after warmed up, it appears to still be to lean,.....

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          • #6
            properly rebuild the carb
            properly fix the choke
            properly set the choke

            go boating
            Cheesehead boating the Gulf Coast of FLA 27.51° N, 82.53° W

            1988 Cruisers Rogue 2420 -VP 290 DP now powered by custom 468 - https://forums.iboats.com/forum/owner...988-rogue-2420

            Past Boats
            1970 Wooster Hellion - Merc 9.8
            2002 SeaRay 190BR - 5.0 - A1G2 - "Cheeseheads in Paradise"
            1984 Avanti 170DLI -3.0 stringer- "Ship Happens"

            What’s behind you doesn’t matter.Enzo Ferrari

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            • #7
              I like your optimism. -choke rebuild to follow
              It's like Murphy's law, but worse; another T.K.O>

              Comment


              • #8
                I like your optimism. -choke rebuild to follow
                It's like Murphy's law, but worse; another T.K.O>

                Comment


                • #9
                  Originally posted by Bondo View Post

                  Ayuh,.... The choke richins the mix, yer motor says it's to lean,......

                  Ya mean somebody tried to rebuild the carb 3 times already,..??

                  Even after warmed up, it appears to still be to lean,.....
                  I mean the carb was rebuilt 10 years ago, then, suspecting a fuel problem rebuilt the next year, then again two years ago.
                  It's like Murphy's law, but worse; another T.K.O>

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                  • #10
                    I went out tonight and set the choke. Absolutely would not start unless I sat there and pumped the throttle. And then it would just rev up to 1500-2000 rpm for just a second or two then die. In my frustration I just held the choke open by hand and it actually turned over and ran. I let it warm up to temp then worked on setting the idle (from a turn &1/2 out) worked them in 1/4 turn at A time till rpm dropped and then backed out half turn. (By now choke was holding open by itself) Rpms were up about1200 at this point so I pulled back the throttle screw by a 1/4 turn and almost immediately it began to struggle and died. Tried to crank it back up and same thing repeatedly; it would try to start or sound like it was right there and then nothing. One of my kids had a popsicle so I took the stick and wedged it between the throttle screw and choke cam and it started right up and reved to 1600 rpm. I pulled the popsicle stick out and it settled back down to 1100. Tried to ease idle back down toward750-800 and it died again. -this all went on repetitively for half an hour until I finally decided the choke cam was to blame... thoughts or insight?
                    It's like Murphy's law, but worse; another T.K.O>

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                    • #11
                      Bump
                      It's like Murphy's law, but worse; another T.K.O>

                      Comment


                      • #12
                        Originally posted by SSTKO81 View Post
                        Bump
                        Ayuh,...... You still have a carb problem,.....

                        Sounds like the idle circuit is plugged up,.....

                        The choke cam ain't the problem,..... in boats, hi-idle is set by the operator with the control stick,.....

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                        • #13
                          Originally posted by Bondo View Post

                          Ayuh,...... You still have a carb problem,.....

                          Sounds like the idle circuit is plugged up,.....

                          The choke cam ain't the problem,..... in boats, hi-idle is set by the operator with the control stick,.....
                          So i don’t need to worry about replacing the fast idle cam? I’ve rebuilt the carb and carefully cleaned the idle circuit passages and replaced the needle/seat. Only thing missing is the cam, but if I don’t really need it....
                          It's like Murphy's law, but worse; another T.K.O>

                          Comment


                          • #14
                            I’ve rebuilt the carb and paid close attention to the idle circuit. It’s as clean and pure as the driven snow. In my working I realized this carb probably didn’t originate on the engine based on the stamping (17059050). When I set the float level, drop and rod I went by the carb number, not the engine. Now it won’t start at all. Just acts like it’s not getting enough fuel unless I sit there and pump the throttle then it’ll try to sputter to life but will not run. Please see the attached picture and tell me what I should have set my carb to or does it matter? -getting frustrated with this pile!
                            It's like Murphy's law, but worse; another T.K.O>

                            Comment


                            • #15
                              Sign up today
                              Do these help? I have a 470 carb on my 140. Just ordered the smaller jet for the 140.
                              Kind regards,
                              Tycer

                              1957 White Canoe Co.
                              . 15’ Lapstrake Runabout
                              . ‘01 Yamaha F25
                              1978 Aristocraft Nineteen
                              . 3.0 Mercruiser 6920118

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