Carb Conundrum
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Thread: Carb Conundrum

  1. #1
    Junior Member
    Join Date
    Nov 2012
    Georgia - Alabama

    Carb Conundrum

    So i've got a vacuum leak somewhere - rebuilt the carbs using Larry's book.

    What I've noticed is that one of my carbs is the exact same as Larry's book shows and the other one has a slight difference where the vacuum cylinder meets the carb body. One has the plastic cushion ring but the other looks like it is actually machined with a matching groove. The reason it's so perplexing is that the side that appears to be machined with the groove seems like the side where i'm getting the leak. the pictures attached are of both carbs, amazingly the one with the machined edge (the most important one to see clearly) is out of focus.

    Anyone have a similar experience or can offer advice?Name:  image2.JPG
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    Last edited by kinghovey; 09-04-2016 at 04:27 PM.

  2. #2
    Senior Member
    Join Date
    Oct 2011
    IIRC there should be a seal between the cap and the carb body in that groove.

    Dig up a parts diagram. I suspect you are missing a part or two.

  3. #3
    Super Moderator CXPHREAK's Avatar
    Join Date
    Aug 2010
    South Australia
    Yep, it's not different, it's just missing the sealing ring. This also sets the low limit for the slide.
    Rebuilding Handlebar Switches

    Rider 81 500C, Thingy Born a 78Z. Ozdeluxe born an 80 shadow.

    GET A MULTIMETER RTFM I am a CX500. If you maintain me I will run forever.

    The WIKI link for all the good tech stuff. including free FSM's with addendums

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  5. #4
    Senior Member
    Join Date
    May 2011
    New Zealand
    and those sealing rings are made of unobtanium... You will have to find a second hand ring , no new ones any more.
    In New Zealand

    1979 CX500 cafe

    1983 CX650ED

    1983 CX650 uber modernish cafe project bike

  6. #5
    Junior Member
    Join Date
    Nov 2012
    Georgia - Alabama
    I'm accustomed to the flat surface where the plastic ring sits, but that other carb doesn't have a flat surface, so the same plastic ring wouldn't fit. Definitely different mating surfaces. I'll try to take a better photos of it next time.

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