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Carb swap?

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  • The CyberPoet
    replied
    Originally posted by duff daddy
    ok mr technical, i think i was pretty damn close
    Indeed you were... I just wanted to give him something he could actually use with an American tape measure or flat-rule.

    PS - don't forget, you owe me a drink at the rally

    Cheers
    =-= The CyberPoet

    Leave a comment:


  • duff daddy
    replied
    ok mr technical, i think i was pretty damn close

    Leave a comment:


  • The CyberPoet
    replied
    31mm = roughly 1.22 inches (1 & 7/32nds) -- just a hair under 1-1/4
    32mm = roughly 1.26 inches (1 & 17/64ths) -- just a hair over 1-1/4
    33mm = roughly 1.3 inches (1 & 19/64ths) -- just a hair under 1-5/16

    Cheers
    =-= The CyberPoet

    Leave a comment:


  • duff daddy
    replied
    Originally posted by Gsxxx600
    just need a tape with millimeters now lol
    thx
    13 mm is a half inch so 25 = 1 inch about and 34 would be about inch and a quarter

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  • The CyberPoet
    replied
    Originally posted by tylerc
    just not enough of a size difference then?
    1mm size difference isn't really enough to make a major difference (1mm smaller in the 98+ produces a little bit better fueling at lower RPM's because of higher velocities through the carbs, but also acts as a constriction point to reduce how much air can flow through at high RPM's). The biggest difference is the addition of the TPS (Throttle Position Sensor) which causes the CDI to use 2 different spark maps, depending on the carb butterfly position and gear -- but to get that, you'd have to swap carbs, CDI's and related wiring. No worth the tiny boost in 1 & 2nd gear, IMHO.

    Cheers
    =-= The CyberPoet

    Leave a comment:


  • tylerc
    replied
    just not enough of a size difference then?

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  • The CyberPoet
    replied
    Originally posted by tylerc
    anyone every swap up to the 98+ for better performance?
    It won't give you any better performance unless your carbs are in bad shape.

    Cheers
    =-= The CyberPoet

    Leave a comment:


  • tylerc
    replied
    anyone every swap up to the 98+ for better performance?

    Leave a comment:


  • Gsxxx600
    replied
    just need a tape with millimeters now lol
    thx

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  • The CyberPoet
    replied
    Simple way to tell definitively:
    measure the opening on the engine side of the carbs -- the measurement in millimeters is the same as the two digits of the carb identifier (i.e. - a BR33ST has a 33mm opening).

    For the Kat 600s, the OEM carbs are:
    88 & 89:
    Mikuni BST31SS (31 mm, 4 each)
    90 - 97:
    BST33SS (33 mm, 4 each)
    98 - 05:
    Mikuni BSR32
    (32 mm, 4 each)

    Cheers
    =-= The CyberPoet

    Leave a comment:


  • katrider
    replied
    I think a Suzuki dealer with good parts counter help can find those numbers for ya...that's where I would start.

    Leave a comment:

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