Retuning Pilot Circuit on 1977 GS550

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  • Guest

    #1

    Retuning Pilot Circuit on 1977 GS550

    I just rebuilt the carbs on my '77 GS550 the other day and while removing the float bowl I accidentally removed the pilot fuel screws in one of the carbs. I counted two turns out on one of the other carbs and did the same for the carb I messed up. I looked in the FSM for a baseline of how far to turn out the pilot fuel screw but noticed it said "do not disturb these screws" referring to the pilot fuel screws. Needless to say I'm a bit freaked out by that. Could I set the pilot air screws two turns out and tune the fuel screws until I get the highest idle from the bike? I do have a carb sync tool. Will it help me with my problem? any insight would be greatly appreciated.

    Thanks
    Matt
  • Nessism
    Forum LongTimer
    GSResource Superstar
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    • Mar 2006
    • 35790
    • Torrance, CA

    #2
    Read this...http://www.thegsresources.com/garage...rb_rebuild.pdf

    You can't clean the carbs with those needles in. Air screw should be set at 1.75 turns open and fuel screws at 3/4 of one turn open. Becareful or you will break the tips of the fuel screws off.

    If you didn't replace the intake pipe boot O-rings you should do it now.
    Last edited by Nessism; 08-24-2013, 03:38 PM.
    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

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