• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

Diaphrams Shrink or Shrunk - too small to go back in Carb now

  • Thread starter Thread starter tweebs
  • Start date Start date
T

tweebs

Guest
Hi All,

I've had a couple project GS650s for a couple years. I started a BS32 rebuild a couple years ago and left 3 of the 4 diaphrams out of the carb on my desk. Now, these 3 diaphrams have shrunk to the point where I can get them to sit in the groove well enough to get the top of the carb on. I've read that these rubber component dry out and can shrink. There doesn't seem to be a consensus as to what the best chemical is to rejuvenate the elasticity of the rubber so I thought I should ask you good people at GS resources what products you recommend.

So far:
MG Chemical - Rubber Renue http://www.amazon.com/MG-Chemicals-Rubber-Liquid-Bottle/dp/B008O9X3KS
Brake Fluid - DOT 4 was the only specific type mentioned (in a youtube video)
Wash in a Washing Machine or Dishwasher with phospor soap
Silcone Spray of some variety

I thought I'd try soaking in gasoline first as it's essentially mix of a bunch of organic solvents and obviously the rubber is usually exposed to in the carb.
 
Actually, the diaphragm is only exposed to filtered air, but good luck with your project. :-\\\

.
 
Steve said:
Actually, the diaphragm is only exposed to filtered air, but good luck with your project. :-\\\

.
Click to expand...

Ummm... Good point. I would have thought there would be some gasoline vapours making it past the slides but they fit pretty tight.
 
Update: I ended up soaking the three carb diaphrams with slides in DOT 4 break fluid for 24 hours. The break fluid did turn from clear to dark brown. It did rexpand the rubber, perhaps a bit too much but they aren't the same original shape. They are now a bit deformed. I've put them back in the carbs and although everything was sealed they don't slide smoothly when the slides return back down. There is a point where they pop/drop as they are coming back down. The rubber is a little deformed. Hopefully leaving them in the carbs will allow the rubber to work itself out.

I'd recommend trying washing the diaphram in hot water to strech them before trying other chemicals.
 
Thanks JTGS. After installing them and letting them sit in the carbs for a day they seem to be sliding better. I've installed them on the bike and started tuning, so far so good. Now I just need a big box fan. That air cooled engine heats up quick and those exhaust gases really make me dizzy. :confused:
 
You must log in or register to reply here.
Back
Top