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Wanted - Slide diaphragms for Mikuni BS34 carburetors

Discussion in 'Classifieds' started by Vacantstance, May 25, 2022.

  1. I can't seem to find the slide diaphragms stateside for the Mikuni BS34 carburetors on my 1980 SX400 Special.
     
  2. CaptChrome

    CaptChrome XS400 Addict

    JBM Industries sells aftermarket diaphragms. I can't vouch for how they work, but they do sell them. You will have to take some measurements to make sure you get the correct part, but it is an option if you can't source some OEM stuff.

    http://jbmindustries.com/Dimensions.html
     
    Vacantstance likes this.
  3. flea

    flea XS400 Enthusiast

    jbm work well on the xs650 carbs , a lot of people have used them for a lot of yrs
     
  4. Will these work on my XS400 Special? I don't really understand carburetors enough to rebuild them. Is there an interchangeable carburetor that I can just buy and swap out?
     
  5. flea

    flea XS400 Enthusiast

    you would have to go onto their website and check for your carbs , theres a bit of fitting involved as only the rubber is supplied not the slide ,they give all the instructions along with a online video , bit dearer but a set of mukuni round slide carbs are worth the money , lot better performance and if motor and exhaust are fairly standard the mukuni distributer will get you fairly close with the jetting ,deal direct with the distributer not a local bike shop .. be cheaper and they will have a better idea on jetting ... by the way a new diaphram slide for the xs650 i could only find in england and that was 140 bucks australian plus shipping so a pair was not that much cheaper than a new set of mukunis
     
  6. tstidham

    tstidham XS400 Enthusiast

  7. flea

    flea XS400 Enthusiast

    the experts on xs650.com played around with these mikes xs carbs for the xs650 and could never get them to work properly , another of mikes rubbish that they still persist in selling , mike xs has a lot of good parts but also persists in selling parts that they know are crap , i stay away from all rubber items and chrome items unless desperate , these performance carbs are just another one to stay away from
     
  8. tstidham

    tstidham XS400 Enthusiast

    Good to know. Thanks.
     
    flea likes this.
  9. Hasty

    Hasty 1983 Maxim XS400

    19
    8
    3
    Ottawa
    I've got a pair of JBM diaphragms coming in the mail right now for my '83 XS400 Maxim, so I can report back on how well they work. As far as installation, they're very easy to access and probably one of the simpler things you could do on a set of carbs so you wouldn't need a super in-depth knowledge.
     
  10. flea

    flea XS400 Enthusiast

    dont forget they have a vidio of instalation on their website if needed
     
    Hasty likes this.
  11. Hasty

    Hasty 1983 Maxim XS400

    19
    8
    3
    Ottawa
    Just an update, can confirm that the JBM diaphragms are super easy to install and fit perfectly. Only had them in a couple of days, but no problems so far
     
    flea likes this.

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