Engine Starts rough but as it warms up it smoothes out

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  • gorrbert
    #1

    Engine Starts rough but as it warms up it smoothes out

    1983 GS1100GL

    I had my Engine rebuilt. New oversized pistons, rings...
    When the bike starts, it misses and backfiers. When the choke is no longer needed, and the bike warms up it sounds great. It's steady and reacts to the throttle instantly, and then goes right back to idle when the throttle is closed. The bike seems to have all the power it should have. I am running with gas that has been stabilized. I've only put about 5 miles on it since it was rebuilt. Because it runs fine when it's wamed up, I feel like I should ride it and see what happens.

    Any help is most usefull. Thanks ahead of time, Gord.
    Tags: None
    • Guest
      #2
      Break in the build and then worry about jetting. Give it at least 500 miles.

        Comment

        • Nessism
          Forum LongTimer
          GSResource Superstar
          Past Site Supporter
          Super Site Supporter
          • Mar 2006
          • 35788
          • Torrance, CA
          #3
          Sounds like the carbs are a little gummed up from sitting. I'd go ahead and ride it for a while to put some miles on the engine. Of course this assumes the carbs are appropriately jetted, or the bike is stock.

          Have fun.
          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

            • rudy
              #4
              When is the last time the valve shims were checked? Carbs synced?

              My 1000 runs a little rough at startup when it's below freezing. I have to keep the rpm's low by fiddling with the choke because cold oil creates too much pressure for the pressure gauge and will peg it and wreck it. I'm sure it would run just fine if I let it wind itself out right away.

                Comment

                • gorrbert
                  #5
                  Valve Shims

                  The valve shims were updated when my engine was rebuilt and my carbs were cleand and jetted last year. I road the bike today and it flies. I'm not real worried about my engine that much. Should I be? Gord.

                    Comment

                    • Guest
                      #6
                      Originally posted by gorrbert
                      The valve shims were updated when my engine was rebuilt and my carbs were cleand and jetted last year. I road the bike today and it flies. I'm not real worried about my engine that much. Should I be? Gord.
                      You were worried enough to post in the tech section.

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