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Replacing Carb Diaphragms?

Nessism

Nessism

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I'm going through a set of BS34's where the previous owner used RTV to seal the slide diaphragm's to the carb body. The RTV is holding tenacious to the diaphragm's so replacing them, or the entire slides, seems like the only path forward. The OEM Mikuni slides are fabric covered with rubber. There are a few options for aftermarket diaphragm's including some from JBM industries also options from the UK and China. Those diaphragm's look to be all rubber.

Has anyone ever traveled this road and if so, what did you decide? Please share.






.
 
Last edited:
Nessism said:
I'm going through a set of BS34's where the previous owner used RTV to seal the slide diaphragm's to the carb body. The RTV is holding tenacious to the diaphragm's so replacing them, or the entire slides, seems like the only path forward. The OEM Mikuni slides are fabric covered with rubber. There are a few options for aftermarket diaphragm's including some from JBM industries also options from the UK and China. Those diaphragm's look to be all rubber.

Has anyone ever traveled this road and if so, what did you decide? Please shre.
Click to expand...

I have a set of OEM ones if you need them, bought a set of carbs on ebay but several had broken posts that were JB welded on so using them for parts.

David.
 
The only bike ive replaced them on is the 77 Yammy XS750. I oiled the lip that goes between the plastic rings and stretched the diaphrams to work them into the rings. Once in go around them a few times and spot stretch them again to be sure they are fully seated against the slides.
 
If/when you do get the new diaphrams on, make sure they are clocked correctly. :-k

When the tab on the diaphragm is in its notch, the vent hole in the bottom of the slide should be directly downstream from the needle.

.
 
Before ordering new diaphragms I thought I'd better make my best effort towards removing the RTV. Tried an over night soak in mineral spirits but that did virtually nothing.
 
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