Question on BS34 main jets for 1100 Katana

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  • Katarat
    • Feb 2026

    #1

    Question on BS34 main jets for 1100 Katana

    I ordered a set of 117.5 main jets from Parts Shark for my 83 GS1100S Katana with the original BS34 carbs on it. They sent K&N Mikuni jets #102.221 which are a smaller diameter then the ones that were in the carbs. They screw in fine but Im wondering if they will work Ok ? Could someone tell me if I need to reorder the larger diameter ones or if these will work OK ? I thought I was ordering the larger ones to start with but this is what they sent. The order was placed back in November so I doubt calling them would help. Thanks for your help.
  • 7981GS

    #2
    Just order the correct jets from Z1 enterprises and have them in less than a week.

    Daniel

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    • posplayr
      Forum LongTimer
      GSResource Superstar
      Past Site Supporter
      • Dec 2007
      • 23673
      • Tucson Az

      #3
      Originally posted by Katarat
      I ordered a set of 117.5 main jets from Parts Shark for my 83 GS1100S Katana with the original BS34 carbs on it. They sent K&N Mikuni jets #102.221 which are a smaller diameter then the ones that were in the carbs. They screw in fine but Im wondering if they will work Ok ? Could someone tell me if I need to reorder the larger diameter ones or if these will work OK ? I thought I was ordering the larger ones to start with but this is what they sent. The order was placed back in November so I doubt calling them would help. Thanks for your help.
      why would they send something different to what you ordered?

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      • Tom R
        Forum Mentor
        Past Site Supporter
        • Sep 2010
        • 777
        • Chicago, IL

        #4
        Originally posted by posplayr
        why would they send something different to what you ordered?
        I'm guessing these were the ones ordered because they have them listed for the BS carbs.
        From what I understand Mikuni sizes these jets by flow - It certainly couldn't hurt to try them.
        I just went through the same thing with partshark earlier this week - it was a little confusing, but ultimately I ordered the KN100-604 jets (I think).
        -1980 GS1100 LT
        -1975 Honda cb750K
        -1972 Honda cl175
        - Currently presiding over a 1970 T500

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        • Katarat

          #5
          I ordered what they showed for the carbs as best I can remember. That was 6 months ago, Im 67 and dont know what I ate for breakfast. I dont know if they are wrong, thats what Im asking. They fit in there OK.

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          • Katarat

            #6
            I just reordered the right ones, its too much work pulling the carbs off with the airbox to change the jets. I swear I ordered the right ones but at this point it doesnt matter. Whats another few bucks for this bottomless pit !

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            • Tom R
              Forum Mentor
              Past Site Supporter
              • Sep 2010
              • 777
              • Chicago, IL

              #7
              Originally posted by Katarat
              I just reordered the right ones, its too much work pulling the carbs off with the airbox to change the jets. I swear I ordered the right ones but at this point it doesnt matter. Whats another few bucks for this bottomless pit !
              Agreed. I try to keep the number of times I take the carbs off to a minimum. That works out to only 4 times so far this year. It's a good thing the pit is bottomless - You'd hate to find out what's down there.
              -1980 GS1100 LT
              -1975 Honda cb750K
              -1972 Honda cl175
              - Currently presiding over a 1970 T500

              Comment

              • Guest

                #8
                If they say 117.5 on the jet they are Mikuni size just made by K&N.
                Sorry to chime in too late but I would of ran them.

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                • Katarat

                  #9
                  About $17.99 too late but thanks anyway Chef. Nothing like paying $6.80 to UPS to deliver 4 jets {cheapest option too}

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