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1150 coughing and spuddering

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    #1

    1150 coughing and spuddering

    I have a new frustrating problem I can't figure out.

    Even when my charging system was completely shot, my bike revved clean to redline.

    Smooth carburetion above 3000 rpm to redline was the norm.

    Now all of a sudden its couging and spuddering about 10 miles into a ride.

    I thought it might be fuel starvation or inline fuel filter clogging or vacuum lock in the tank.

    I just returned from a horrible 80 mile ride where I had the fuel filter on, then stopped at Schucks, removed the fuel filter and rode out the parking lot. Still spuddering, I pulled over took the gas cap completely off, and rode same thing.

    I've covered just about all the wiring on the bike and replaced many shoddy connectors etc.

    The bike recently had a Dyna S installed and timed with a gun, the rectifier has been replaced a new used stator installed, fresh plugs.

    It feel like its running out of gas, like the floats are emptying. If I back out of the throttle it seems to clear out momentarily, but then if I maintain steady throttle in 4 or 5th it begins to hesitate and feels as if its running on 2 cylinders. If I close the throttle completely for a moment and then introduce it again it feels like its running on all four.

    Anything beyond 1/4 throttle openings eventually it starts cutting out. I can't quite tell if its electrical or carburetion.

    The bike has 3ohm dyna coils, ngk caps. The tank does have some rust in it, that's why I had the filter on. The petcock is a Pingel with no vacuum line. Carbs are off a 90 GSXR 11 36mm. I've been running the setup for 5 years with no issues after getting the mixtures right. I'm stumped on where to look next. Thanks for any theories.
    GS\'s since 1982: 55OMZ, 550ES, 750ET, (2) 1100ET\'s, 1100S, 1150ES. Current ride is an 83 Katana. Wifes bike is an 84 GS 1150ES
    Tags: None
    #2
    Nobody out there have any words of wisdom?
    GS\'s since 1982: 55OMZ, 550ES, 750ET, (2) 1100ET\'s, 1100S, 1150ES. Current ride is an 83 Katana. Wifes bike is an 84 GS 1150ES

    Comment

      #3
      Before I give you my thoughts, Ride it again only this time when it starts to sputer ever so slowly start turning on the choke. see if the problem goes away.
      Pat

      Comment

        #4
        I've tryed that with other troubleshooting, but failed to try it this time.

        The carbs are off at the moment, so I'll have a look in there first.
        GS\'s since 1982: 55OMZ, 550ES, 750ET, (2) 1100ET\'s, 1100S, 1150ES. Current ride is an 83 Katana. Wifes bike is an 84 GS 1150ES

        Comment

          #5
          You said you have some rust in the tank and that is why the inline fuel filter.
          Removing the filter does not help the situation. I will bet you 5 cents to a tenspot that the sediment in the tank is being drawn over the screen or into the petcock and restricting fuel flow. when you shut down the engine and remove the fuel line, fuel flows easily. As soon as there is draw from the engine, it pulls the sediment back into place to clog it back up. I would remove the petcock, clean it out and clean the screen. I would also slosh some gas around in the tank with the petcock removed and let it wash/drain all the sediment out.

          Earl

          Originally posted by Carter Turk
          Nobody out there have any words of wisdom?
          Komorebi-The light filtering through the trees.

          I would rather sit on a pumpkin and have it all to myself than be crowded on a velvet cushion. H.D.T.

          Comment

            #6
            What about running some SeaFoam or Berryman's B12 through with the next tank of gas, just in case there is a deposit in the carbs? Can't hurt, right?

            Comment

              #7
              I was thinking about removing the petcock as removing the fuel filter did nothing for flow. I thought maybe the rust deposited enough on the filter to cause flow problems.

              Earl I'll let you know if you're correct

              Never heard of the foam or B12. What is it and where do I find it?

              Thanks for the help
              GS\'s since 1982: 55OMZ, 550ES, 750ET, (2) 1100ET\'s, 1100S, 1150ES. Current ride is an 83 Katana. Wifes bike is an 84 GS 1150ES

              Comment

                #8
                Rust debris is the #1 cause for ill acceleration from clogged carbs. The debris is most likely all clogged in your fuel petcock. The debris also most commonly plugs the pilot jets. How does the engine idle?

                Comment

                  #9
                  The assumption is you're running out of gas. What do your plugs look like when the engine misfires? If they are black/sooty, fuel starvation isn't your problem.

                  Comment

                    #10
                    Yea, you mention this wonderful ignition, but what about new plugs?

                    Comment

                      #11
                      The plugs look fine, no black soot. And I did mention new plugs in the first post.
                      GS\'s since 1982: 55OMZ, 550ES, 750ET, (2) 1100ET\'s, 1100S, 1150ES. Current ride is an 83 Katana. Wifes bike is an 84 GS 1150ES

                      Comment

                        #12
                        B-12 can be found at Walmart. Its intended for varnish build up. I dont think it would do a thing for blockage due to rust sediment.

                        Earl


                        Originally posted by Carter Turk
                        I was thinking about removing the petcock as removing the fuel filter did nothing for flow. I thought maybe the rust deposited enough on the filter to cause flow problems.

                        Earl I'll let you know if you're correct

                        Never heard of the foam or B12. What is it and where do I find it?

                        Thanks for the help
                        Komorebi-The light filtering through the trees.

                        I would rather sit on a pumpkin and have it all to myself than be crowded on a velvet cushion. H.D.T.

                        Comment

                          #13
                          Well, the Pingel petcock looked pretty darn clean. No noticable blockage apparent.

                          Could my Dyna coils that I bought in 96 be functioning intermitently?

                          I have this feeling I'll putting everything back on, not finding anything obvious and the same symptoms will be there.

                          I'm just getting into the carbs, they look clean so far.
                          GS\'s since 1982: 55OMZ, 550ES, 750ET, (2) 1100ET\'s, 1100S, 1150ES. Current ride is an 83 Katana. Wifes bike is an 84 GS 1150ES

                          Comment

                            #14
                            If the Pingel is clean and the Dyna S is about new, then I would suspect coils. The first thing I would check is voltage to the coils. If thats OK, then I would check the coils.
                            I have had coils that checked good for specs and broke down once warmed up though.

                            Earl

                            Originally posted by Carter Turk
                            Well, the Pingel petcock looked pretty darn clean. No noticable blockage apparent.

                            Could my Dyna coils that I bought in 96 be functioning intermitently?

                            I have this feeling I'll putting everything back on, not finding anything obvious and the same symptoms will be there.

                            I'm just getting into the carbs, they look clean so far.
                            Komorebi-The light filtering through the trees.

                            I would rather sit on a pumpkin and have it all to myself than be crowded on a velvet cushion. H.D.T.

                            Comment

                              #15
                              The dyna coils don't last forever. I just replaced mine [bought new in 1990] with the 23 year old stock coils and now the bike rips.I was having a intermittant miss at 7000-9000 rpms. Also check the wires going to the coil from the harness they have a tendency to short out on the frame if you are using the stock coil mounts.Tony

                              Comment

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