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    #1

    Need diagnosis...bike surging

    Ok. I have done quite a bit to the bike in the last couple months. . Rebuild carbs. Synchd. Did valves. New plugs. New petcock. New stator and RR. New ground wires. Changed oil and shaft oil. Airbox pretty well sealed but i havent oiled the air cleaner yet. Bike has 9700 miles. GS 850 GLZ.

    So I got new stator and RR in and took it for only its second ride. It is surging a bit. It idles nice at 1200. But riding it, it will surge...sometimes pulling hard, sometimes not. So acceleration is inconsistent.

    What can be causing this ? Would appreciate all ideas.

    Thanks.
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    #2
    Originally posted by Gary_t200 View Post
    Ok. I have done quite a bit to the bike in the last couple months. . Rebuild carbs. Synchd. Did valves. New plugs. New petcock. New stator and RR. New ground wires. Changed oil and shaft oil. Airbox pretty well sealed but i havent oiled the air cleaner yet. Bike has 9700 miles. GS 850 GLZ.

    So I got new stator and RR in and took it for only its second ride. It is surging a bit. It idles nice at 1200. But riding it, it will surge...sometimes pulling hard, sometimes not. So acceleration is inconsistent.

    What can be causing this ? Would appreciate all ideas.

    Thanks.
    Could be running too lean on the needle, or just not getting enough fuel when the demand is high.

    Did you fit an inline filter to your fuel line? If so, they can cause a flow restriction if the wrong type is used, or if they are positioned with a loop in the line.
    :) The road to hell is paved with good intentions......................................

    GS 850GN JE 894 10.5-1 pistons, Barnett Clutch, C-W 4-1, B-B MPD Ignition, Progressive suspension, Sport Demons. Sold
    GS 850GT JE 1023 11-1 pistons. Sold
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    GS1100GD, future resto project. Sold

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      #3
      Yes I did put one on. It may be the culprit. I will remove it. Don't really need it w my new petcock.

      Also, it does actually kind of bog down a bit if I hit throttle fast. I think I actually may be rich, not lean. Definitely no sign of rising or hanging idle. But it's also not stumbling and dieing at idle.
      Last edited by Guest; 10-15-2013, 12:43 AM. Reason: Forgot stuff

      Comment

        #4
        ok - I took off the filter and its still doing it...It's almost like one cyclinder is cutting out...not sure. But I would have suspected more substantial loss of power if one was cutting out.

        I notice one pipe with a blue tint now and three with a yellow tint. Not sure what that means...

        Comment

          #5
          Where are your carbs' vent hoses? They need to terminate in still air. Behind the airbox is stock, just below the little loop on the back of box that keeps them in place and tidy.
          Dogma
          --
          O LORD, be gracious to me; heal me, for I have sinned against you! - David

          Skeptical scrutiny is the means, in both science and religion, by which deep insights can be winnowed from deep nonsense. - Carl Sagan
          --
           '80 GS850 GLT
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            #6
            Originally posted by Gary_t200 View Post

            I notice one pipe with a blue tint now and three with a yellow tint. Not sure what that means...
            The blue one is running lean...
            are these stock pipes or some 4-1 pipe?
            http://img.photobucket.com/albums/v5...tatesMap-1.jpg

            Life is too short to ride an L.

            Comment

              #7
              Thank you guys for weighing in...Stock pipes.

              Bike is entirely stock and in great cosmetic condition... I dont think it has run in many years though as it was a mechical mess when I got it and would barely run fully choked and nothing at all otherwise. Also didnt charge.

              I will check where vent hoses are...

              Comment

                #8
                Check your float levels, and make sure float valves work properly.

                Comment

                  #9
                  OK the stock pipes are double walled, they don't blue easily. For them to turn blue it is REALLY lean and REALLY HOT in there.
                  http://img.photobucket.com/albums/v5...tatesMap-1.jpg

                  Life is too short to ride an L.

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                    #10
                    I'd oil the air filter. Surging is lean and oiling the filter will richen the mixture. Plus, not oiling the filter lets dirt get though to the engine which does no good.
                    Ed

                    To measure is to know.

                    Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

                    Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

                    Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

                    KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

                    Comment

                      #11
                      Ok. Some good thoughts there. Filter is dry. I will oil it and also redo pilot screws...making sure to open the blue pipe more. When I redid the carbs I was really careful with floats. I set them perfectly. But I could replace the float needles...

                      I also plan to snip a 1/4" off the spark wires and reseat the caps.
                      Last edited by Guest; 10-16-2013, 10:56 PM. Reason: Forgot stuff

                      Comment

                        #12
                        Please check and reset your points. Make sure that easy item is accounted for before you go tearing into your fuel system.

                        Comment

                          #13
                          Originally posted by mattfeet View Post
                          Please check and reset your points. Make sure that easy item is accounted for before you go tearing into your fuel system.
                          Good suggestion but the bike in question doesn't have points.
                          Ed

                          To measure is to know.

                          Mikuni O-ring Kits For Sale...https://www.thegsresources.com/_foru...ts#post1703182

                          Top Newbie Mistakes thread...http://www.thegsresources.com/_forum...d.php?t=171846

                          Carb rebuild tutorial...https://gsarchive.bwringer.com/mtsac...d_Tutorial.pdf

                          KZ750E Rebuild Thread...http://www.thegsresources.com/_forum...0-Resurrection

                          Comment

                            #14
                            Timing may be an issue...not sure I did that right. I did a chk and thought it was ok but I may not have been thorough enough. Its on my list to dig back into...

                            Comment

                              #15
                              Originally posted by Nessism View Post
                              Good suggestion but the bike in question doesn't have points.
                              That's what I get for reading the title and skipping straight to a reply.

                              Comment

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