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Repairing diaphragms ??

  • Thread starter Thread starter MatBirch
  • Start date Start date
just a thought...I remember reading somewhere for a quick emergency repair on a diaphragm one could use those "skin" patches that are used for bicycle tubes now days. Any one ever try this or know if it even works?
 
520eek said:
just a thought...I remember reading somewhere for a quick emergency repair on a diaphragm one could use those "skin" patches that are used for bicycle tubes now days. Any one ever try this or know if it even works?
Click to expand...
It would be difficult for the diaphragm to work properly, but it might get you home.
Tha link to JBM Industries is useful - I think I might need diaphragms for the XJ at some point, and $20ea is better than 40 or 50Euros.
 
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I have repaired them using a patch made from a 5 mil rubber glove, like the cheap blue ones you get at harbor freight and high temp RTV. Use the RTV sparingly and cut the patch so it is about 1/4 inch larger all around than the tear. Apply the patch on the top side of the diaphragm so it never comes in contact with the carb slider or throat. Let it sit at least overnight before assembly.
Good luck.
 
jdvorchak said:
I have repaired them using a patch made from a 5 mil rubber glove, like the cheap blue ones you get at harbor freight and high temp RTV. Use the RTV sparingly and cut the patch so it is about 1/4 inch larger all around than the tear. Apply the patch on the top side of the diaphragm so it never comes in contact with the carb slider or throat. Let it sit at least overnight before assembly.
Good luck.
Click to expand...

How long did the repairs last?

Until you sold the bike? LOL
 
I fixed it for a friend of mine two years ago. It's still holding.
 
jdvorchak said:
I have repaired them using a patch made from a 5 mil rubber glove, like the cheap blue ones you get at harbor freight and high temp RTV. Use the RTV sparingly and cut the patch so it is about 1/4 inch larger all around than the tear. Apply the patch on the top side of the diaphragm so it never comes in contact with the carb slider or throat. Let it sit at least overnight before assembly.
Good luck.
Click to expand...

The blue ones I see are nitrile rubber which is theoretically 'fuel proof'. Latex would be a disaster; the coating on the diaphragms is probably nitrile [??] and silicone is pretty inert, so this system looks like a viable one. There's also vinyl gloves, but my guess would be they they'd harden over time, if they didn't dissolve. Nitrile rubber is the 'right' rubber for oil and gas. They're also pretty tough and handy for working on dirty stuff and solvents, etc. Cheap by the box at the industrial supply.
 
nitrile, eh? gets me thinking about that other troublesome diaphragm "needing emergency repair"- the petcock.
 
You may want to us "The Right Stuff" instead of RTV as its resistant to oil and gas, where RTV doesn't seem to care for exposure to gasoline.
 
TxGSrider said:
You may want to us "The Right Stuff" instead of RTV as its resistant to oil and gas, where RTV doesn't seem to care for exposure to gasoline.
Click to expand...

In the carb diaphragm the edge of the adhesive is exposed to gasoline vapour, but otherwise sealed in. The underside is dry and vented, but everyone seems to want to repair it on the top, despite the pressure holding the patch on being on the underside. In theory, you would patch an inner tube on the inside, but?..

On a petcock diaphragm it's wet on one [piston] side; until it fails.

What is in The Right Stuff anyway? Chemically, I mean?
 
Having just pulled apart my carbs today, I discovered 3 of the diaphragms are in need of replacement. My mood at an unanticipated $450 expense had me feeling pretty down. I am extremely happy to see the jbm industries site and will be purchasing from them soon. So thanks from another for that link. You've made my night :)
 
Xanthius said:
Having just pulled apart my carbs today, I discovered 3 of the diaphragms are in need of replacement. My mood at an unanticipated $450 expense had me feeling pretty down. I am extremely happy to see the jbm industries site and will be purchasing from them soon. So thanks from another for that link. You've made my night :)
Click to expand...

There are lots of people around here with spare parts. You might want to post a WTB ad before spending on those diaphragms.
 
I have some good condition diaphragm and slides if you need them at a very reasonable price. PM me if you need them. Assuming that they're for an 1100 with BS34SS carbs.
 
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