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Cracked diaphragms...now what?

  • Thread starter Thread starter BIG_brother
  • Start date Start date
B

BIG_brother

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All 4 of my diaphragms look like this! I am now ****ed!

Rebuilding carbs on my 82 GS1100

bikebandit wants $106 a piece THAT IS INSANE!
IMAG0124_zpsdb92ee85.jpg
 
i know I may get flamed for this..BUT OH WELL!!


Honestly, thats not a "critical" spot for a crack. Just a thin dab of Ultra Black RTV gasket maker will seal them and all will be well again. Put it on the side thats showing in the picture and let it cure overnight before reinstalling the slides.

Clean he rubber with some rubbing alcohol for a nice clean surface for the RTV to bond to.
 
Yeah, they're not cheap, Boulevard Suzuki wants $99.42 each for them.
http://www.boulevardsuzuki.com/fich...y=Motorcycles&make=SUZUKI&year=1982&fveh=2156

I'm not one for recommending non Suzuki parts, so I don't know about the quality of these, but they're allot cheaper.
http://www.ebay.com/itm/SUZUKI-GN25...Parts_Accessories&hash=item43baa8e9c5&vxp=mtr

If that's the worse of the lot, I believe it can be repaired with some type of cement. After that a little grease around the edges will hope promote a seal.

Don't know if these will work but they say they're for a BS34 carb.
http://www.ebay.com/itm/BRAND-NEW-C...Parts_Accessories&hash=item3f246f5972&vxp=mtr

Perhaps Bill (Chef1366) will have some, might want to contact him.
 
I patched up the diaphragms on my Honda with RTV and patches cut from nitrile gloves, worked like a charm:D
 
chuck hahn said:
i know I may get flamed for this..BUT OH WELL!!


Honestly, thats not a "critical" spot for a crack. Just a thin dab of Ultra Black RTV gasket maker will seal them and all will be well again. Put it on the side thats showing in the picture and let it cure overnight before reinstalling the slides.

Clean he rubber with some rubbing alcohol for a nice clean surface for the RTV to bond to.
Click to expand...

My two cents....I agree fully. Clean with alcohol. What popped into my mind was applying the rtv to both sides of the damaged areas.....a long smooth swipe of it to increase the bonding area. Also I would possibly attempt to very lightly lubricate the carb cap and body with o ring silicone or vaseline and right after applying the rtv put the diaphram into carb body and install the cap with the 4 allen nuts finger tight.
This will allow the rtv to naturally form to the final shape. Just finger tight as to not starve the new joint you are creating. Sit overnight? Remove and see how it went?
Just some thoughts.
Maybe overthinking.....lol
Im the hyper type. Lol

Or you could just swipe some rtv on, let it dry....be done with it.
Either option is a cost effective alternative to try.
 
Hi,

greg78gs750 said:
i agree with chuck on this one, rtv has its uses.
Click to expand...

Yes, some minor defects can be repaired and can last for a good while. Weigh all your options (and budget) and keep us informed. Good luck. ;)


Thank you for your indulgence,

BassCliff
 
I'd search out some good used parts. Shouldn't be hard to find or expensive.
 
A fine paint brush and some "Gorilla Glue" worked great on my 1150 until I found some parts carbs... or beg some ProSeal off a rotary AME.

Hey Ed, a lot of your old bikes look like new golf gear... ???
 
Last edited:
I used to recone speakers and I still have some glue. Gonna give it a shot this bites
 
BIG_brother said:
I used to recone speakers and I still have some glue. Gonna give it a shot this bites
Click to expand...

Just do it and be done with it. I don't think you're going to have any problem with them. Those cracks are in the squish, mating top and bottom carb, compression area.
 
carb parts

carb parts

I have a box full of then from a 1980 GS 550. If they will work you can haave one free.
 
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