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    #1

    Mikuni jet sizes

    Hi everyone. Just wondering how mikuni sizes their jets? I have a 117.5 and I've been told.by some members on here to go up 2 sizes. What number would that be? Thanks for any help
    Last edited by Guest; 05-01-2017, 12:28 AM.
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    #2
    Most would agree that it would be a 122.5, but there are some that say that a full size would be a numerical increase of 5, so they would say 127.5.

    What bike do you have and why do you feel you need to go up, let alone two sizes?

    .
    sigpic
    mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
    hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
    #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
    #2 son: 1980 GS1000G
    Family Portrait
    Siblings and Spouses
    Mom's first ride
    Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
    (Click on my username in the upper-left corner for e-mail info.)

    Comment

      #3
      Originally posted by Steve View Post
      Most would agree that it would be a 122.5, but there are some that say that a full size would be a numerical increase of 5, so they would say 127.5.

      What bike do you have and why do you feel you need to go up, let alone two sizes?

      .
      It's an 81 gs400x with pods. Bought it not running with pods no airbox. I know I need to rejetting because of the pods. Finally got it running and my throttle just dies around 7.5k. Been told by several forum members I'll need to jump 2 sizes in previous threads

      Comment

        #4
        I have no info or experience on the GSX400, but I will guess that you need to go up more than just 2 sizes.

        .
        sigpic
        mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
        hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
        #1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
        #2 son: 1980 GS1000G
        Family Portrait
        Siblings and Spouses
        Mom's first ride
        Want a copy of my valve adjust spreadsheet for your 2-valve per cylinder engine? Send me an e-mail request (not a PM)
        (Click on my username in the upper-left corner for e-mail info.)

        Comment

          #5
          Keihin, Dynojet, Mikuni Jet Size Cross Reference Tech
          http://www.jockeyjournal.com/forum/showthread.php?t=64769
          MY BIKES..1977 GS 750 B, 1978 GS 1000 C (X2)
          1978 GS 1000 E, 1979 GS 1000 S, 1973 Yamaha TX 750, 1977 Kawasaki KZ 650B1, 1975 Honda GL1000 Goldwing, 1983 CB 650SC Nighthawk, 1972 Honda CB 350K4, 74 Honda CB550

          NEVER SNEAK UP ON A SLEEPING DOG..NOT EVEN YOUR OWN.


          I would rather trust my bike to a "QUACK" that KNOWS how to fix it rather than a book worm that THINKS HE KNOWS how to fix it.

          Comment

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