diaphragm

  1. TwoManyXS1Bs

    JBM Industries BS38 Diaphragms - Fail?

    Started getting off-idle stumbling, hesitation, on left XS1B BS38 carb. Pulled carbs, left carb failed the diaphragm drop test. Plugged starter circuit, still fails. Found the JBM diaphragm was no longer a snug fit on the slide. Easily rotated, easily removed. It appears that the...
  2. L

    Bad slide diaphragm symptoms

    Hi everyone, What are the symptoms of a bad slide diaphragms? Does it affect bike at idle ? Regards,
  3. Borracho

    Carburetor diaphragm good or bad? 82 Heritage Special

    I need some help determining if one of my carburetor diaphragms is still good to go or trash. I'm thinking the latter but maybe not. I pulled off the cap and noticed that the diaphragm was not inserted correctly the last time I took the carbs apart. As a result one of the edges was flattened...
  4. bluebikerblan

    BS 38 Carb Diaphragm Replacements

    Please note that a new diaphragm replacement part is being made by JBM Industries http://www.jbmindustries.com/Yamaha650.html These have been designed and produced by the same gent, Donald James that is supplying the new design carburetor boots (previously posted). I've just ordered two...
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