Starting Problem

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  • dads550
    #1

    Starting Problem

    GS Resources Rocks-- I've never seen a group work so hard to help other people solve problems. I like being part (a new part) of this group.

    My bike is a '77 GS550 that was my Dad's. It was resurrected from the dead this year with about 9,500 miles on it. Most everything rubber and some things that aren't have been replaced. I've rebuilt the carbs, adjusted the valves, etc. Airbox and exhaust are bone stock.

    The bike runs really well, but when starting it warm, I have to give it a little throttle to get it to start. It will crank over strongly and practically start to idle but it won't actually start. When it does start, it idles around 1,200 rpm.

    Is this a problem with the air mixture or what? I just can't figure out what it could be.
    Tags: None
    • earlfor
      Forum LongTimer
      Charter Member
      GSResource Superstar
      Past Site Supporter
      • May 2002
      • 42413
      • off grid cabin 1/24/26 7pm
      #2
      It sounds like youre just a touch lean on the idle circuits. Easiest thing to try is to turn the airscrews in about 1/2 turn. See if that helps. Since you have a 77 model (VM carbs), if the airscrews dont fix it, turn the pilot fuel screws out about 1/4 turn.

      Earl

      Originally posted by dads550
      GS Resources Rocks-- I've never seen a group work so hard to help other people solve problems. I like being part (a new part) of this group.

      My bike is a '77 GS550 that was my Dad's. It was resurrected from the dead this year with about 9,500 miles on it. Most everything rubber and some things that aren't have been replaced. I've rebuilt the carbs, adjusted the valves, etc. Airbox and exhaust are bone stock.

      The bike runs really well, but when starting it warm, I have to give it a little throttle to get it to start. It will crank over strongly and practically start to idle but it won't actually start. When it does start, it idles around 1,200 rpm.

      Is this a problem with the air mixture or what? I just can't figure out what it could be.
      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

        • dads550
          #3
          That's great. I'll give it a try tonight.

          Thanks for the reply.

            Comment

            • rustybronco
              Forum LongTimer
              Bard Award Winner
              GSResource Superstar
              Past Site Supporter
              • Jul 2005
              • 14961
              • Marysville, Michigan
              #4
              I must ask, have you replaced the boots from the carbs to the heads and the orings? sync'd the carbs yet?
              De-stinking Penelope http://thegsresources.com/_forum/sho...d.php?t=179245

              http://www.thegsresources.com/_forum...35#post1625535

                Comment

                • 8trackmind
                  #5
                  Originally posted by rustybronco
                  I must ask, have you replaced the boots from the carbs to the heads and the orings? sync'd the carbs yet?
                  And the clamps that go on the boots...They may need replacing as well.

                    Comment

                    • dads550
                      #6
                      Everything - boots, clamps and o-rings have been replaced. I don't have a problem with a hanging idle or anything else that would indicate an intake leak.

                      I've synched the carbs, too. The bike really does run great. I probably just went too far with the air mixture adjustments and do have it too lean. I'll let you know what happens after I get it adjusted.

                        Comment

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