Anyone used JBM Industries Diaphragms for the BS38 or BS36?
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JBM Industries Diaphragms
- Thread starter BowlingSS
- Start date
Yes, bs38's on currently.
Had to spot some Gorilla Glue on the slides to keep them from turning.
They found out that it does happen on occasion and suggested some glue to hold them in place.
Had to spot some Gorilla Glue on the slides to keep them from turning.
They found out that it does happen on occasion and suggested some glue to hold them in place.
Where did you put the glue? Top or under the diaphragm?
Top.
I'll add that only one slide was turning.
I put the diaphragms in and took her for a spin. Ran fine for a while. Checked the carbs and the one had turned. The 38's have that bevel that faces rear and it had turned. I recalled reading about the issue and just put a spot on both, topside. Been holding fine.
I'll add that only one slide was turning.
I put the diaphragms in and took her for a spin. Ran fine for a while. Checked the carbs and the one had turned. The 38's have that bevel that faces rear and it had turned. I recalled reading about the issue and just put a spot on both, topside. Been holding fine.
Thanks for the info.
My JBM’s are working fine. Drop of crazy glue to prevent rotation. Added the glue in the groove on the slide where the diaphragm locks in.
dps650rider
XS650 Addict
I put a set of these in, they are too stiff and the slides sometimes don't return like they should. Do they loosen up with time?
If the symptom is rev not coming down it can be other things . Leaks ? Idle to High ?? Sticking wire ???
I am not good at carburetors .. Others can have better information But wipe the bores with a cleen rag and some solvent can be one
way forward perhaps
Did you install the slides in the same carb they came out of?
Mine are still working great.
dps650rider
XS650 Addict
Yep. It's not the slides it's the diaphragms. On the bench with the carbs level if you push them up all the way they don't come back down immediately when you let go like they should. If I run wot then back off quickly to about half it will sometimes stumble because of this. Once things warm up and the material softens it gets better.
dps650rider
XS650 Addict
Did they return ok on the bench? How long have you been running them?
Are the slide springs in good shape? The JBM’s in my ‘76 have been working great.
dps650rider
XS650 Addict
Good question. They measure 4.25" extended.
Possibly, if the slides were swapped one could stick due to a slight difference in wear.
