Do I need to go up one size main jet ...?

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  • Guest
    #1

    Do I need to go up one size main jet ...?

    I'm planning to use a drop-in (stock config) K & N air filter in my GS850GLZ. Currently I'm cleaning/rebuilding the carbs and will soon try to fire up the bike. No pods, just putting a K & N filter in the airbox.

    I haven't installed the carbs back on the bike yet, as I'm still doing some other work in preparation for the "start-up" event.

    All carb parts are stock, except I raised the jet needles .050" (approx. one notch).

    The stock mains are 115's. Should I go up to 120's because I'm using the K & N air filter??

    Just wondering if any of you guys have any experience with this.

    thanks,

    mike
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    • Nessism
      Forum LongTimer
      GSResource Superstar
      Past Site Supporter
      Super Site Supporter
      • Mar 2006
      • 35788
      • Torrance, CA
      #2
      I don't think you need to go up on the main, at least I didn't after dropping in a K&N. Runs great.
      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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        • Guest
          #3
          Originally posted by Nessism
          I don't think you need to go up on the main, at least I didn't after dropping in a K&N. Runs great.

          Thanks - I'll keep it stock then...

          mike

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            • tkent02
              Forum LongTimer
              Past Site Supporter
              • Jan 2006
              • 35571
              • Near South Park
              #4
              See how it runs, then do what it needs.
              Pods on my GS1000 needed a big change, K&N in the box only needed a small change, one jet size.
              The 4-1 pipe was already on there, and things are weird from the elevation around here anyway.
              If your bike was on the verge of being too lean as it was, a bigger main will be right.
              Last edited by tkent02; 06-12-2008, 09:15 AM.
              http://img.photobucket.com/albums/v5...tatesMap-1.jpg

              Life is too short to ride an L.

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                • Guest
                  #5
                  Originally posted by tkent02
                  See how it runs, then do what it needs.
                  Pods on my GS1000 needed a big change, K&N in the box only needed a small change, one jet size.
                  The 4-1 pipe was already on there, and things are weird from the elevation around here anyway.
                  If your bike was on the verge of being too lean as it was, a bigger main will be right.
                  Thanks mr. tkent,

                  I have no history on how the bike ran - it's been sitting for 15 yrs. I was just looking for a good place to start... The current plugs (Champions!!) are a mix of 2 black & 2 whilte - hoping that doesn't mean a bad coil.

                  I visit Lousiville (up the road from you) every now & then - my wife is from there. i really love the Boulder area. But you're right, the elevation is UP there - we like to go to Brainard Lake & look for mushrooms, that's somewhere arounf 10K elevation if I remember correctly. Engines run different at that O2 level for sure.

                  Regards,

                  Mike

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