Can I use these gauges with my carbs?
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Can I use these gauges with my carbs?

This is a discussion on Can I use these gauges with my carbs? within the Technical forums, part of the Caferacer.net Forums category; Well first off hello and Merry Christmas to all! As some of you know I finally got my beloved cl350 up and running right before ...

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  1. #1
    Senior Member cafe350's Avatar
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    Can I use these gauges with my carbs?

    Well first off hello and Merry Christmas to all!

    As some of you know I finally got my beloved cl350 up and running right before the weather turned, and while it does run pretty good I want it running great when spring time comes around.

    So, in addition to picking up some main and pilot jets to experiment with, I've been eyeballing this carb gauge set:

    http://cgi.ebay.com/ebaymotors/ws/eB...K%3AMEWAX%3AIT

    It's an EMGO product, I believe. I see them for sale everywhere but this is the cheapest I've seen it offered.

    But will it work with a set of Mikuni VM carbs? The listing refers to it as a "vacuum gauge" set -pardon the ignorance, but do the carbs in question need to be vacuum type carbs for this to work?

    Thanks in advance
    \"Hey, McCloud! Get off of my ewe!\"

    Trevor,
    \'72 Honda cl350 (sold)

    \'80 gs450E, the \"spooky \'Zuki\"

    \'04 Kawasaki Ninja 500

  2. #2
    Senior Member HackAsaw's Avatar
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    I don't see enough there to make those useful on a two cylinder engine having individual intake runners.

    You'd be better off using plain vinyl tubing and colored fluid of choice.

    Mercury first choice, many use atf, some use colored water.

    Study mercury gauges and you'll see they are merely tubing with a scale.

    Those gauges would require tiny metering orifices and/or a damping accumulator to obtain anything useful from them for ir applications.
    Accidental inventor of the worlds fastest wearing rocker arms and other edible engine parts! Try my yummy blue cheese camshafts!

  3. #3
    Senior Member gs1327's Avatar
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    Those come with little plastic valves to put inline to act as an orifice/damper. They work ok but the Gauges don't always repeat -

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  5. #4
    Senior Member HackAsaw's Avatar
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    The problem is that the aneroid chamber is a fixed size.

    It isn't possible to dampen the violent pulsations and have anything resembling accurate for a broad range of engines.

    Save your money and make your own using clear hose and colored juice.

    Secure them to a board with fixed increments marked.

    Calibration is easy enough.
    Accidental inventor of the worlds fastest wearing rocker arms and other edible engine parts! Try my yummy blue cheese camshafts!

  6. #5
    Senior Member kenessex's Avatar
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    HackA is right. Google "home made manometer" or variations of it and you will find some how-to's. It is easy and fun to make your own that will be more accurate than cheap gauges.

    Ken
    WERA 119
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  7. #6
    Senior Member CurbTiger's Avatar
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    Scrap the shitty green valves that come with those and get some drip irrigation valves( http://www.dripirrigation.com/drip_i...p55crme0ssk735 ).
    Then you'll need some way of getting to the manifold side of the carb:
    http://www.mcmaster.com/#barbed-hose-fittings/=aal3np
    Drilla hole inyer manifold and plug the coupling in.
    Calibrate both gauges by hooking them up to the same vacuum source. Hopefully they will read the same.
    Then have at it.
    To dampen the pulses, just dial down the valves till there is just a little flutter. It goes away once rpm's go up.
    Gauges work best for me. They help you see if one side of the splitter/cable ass'y is hanging up. Plus it's just funner to watch 'em.

    NE
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  8. #7
    Senior Member crazypj's Avatar
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    just stick a 25 pilot jet in first couple of inches of tube, it damps out pulses (as recommended by Suzuki when setting up TL/SV1000)
    I dabble in rocket science, when I\'m not picking my nose
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  9. #8
    Senior Member HackAsaw's Avatar
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    Do ya think the same size jet recommended for a 500cc cylinder will be best for a 175cc cylinder?

    I don't.

    Regardless, I dig my mercury gauges and manometers.

    They are indeed far more useful and less fussy than chambered analog vac meters.
    Accidental inventor of the worlds fastest wearing rocker arms and other edible engine parts! Try my yummy blue cheese camshafts!

  10. #9
    Senior Member Kurlon's Avatar
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    Keihn or Mikuni #25?

  11. #10
    Senior Member crazypj's Avatar
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    Mikuni
    Hack, it doesn't matter, it's to damp down pulses.
    The restriction will allow the main length of tube to act as a plenum, vacuum may build a bit slower but it will still be vacuum.
    You need to stop sniffing mercury vapor, it's making you crazier than me [8D]
    I dabble in rocket science, when I\'m not picking my nose
    The other night I gave my girlfriend an orgasm, but, she spat it back at me

    'you can take my word for it or argue until you find out I'm right'

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