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CV Carb Slide "Boots" How to tell if OK?

1980GS1000E

1980GS1000E

Forum Mentor
Past Site Supporter
I looked at the GS850 carb technical info and pics on this site (excellent) and now I am wondering how to tell when the CV carb diaphragms are bad. Mine appear to be a little swollen and wrinkled when in position in the carbs. I am having some (what I believe to be) carb issues and probably should rebuild these carbs as they look almost 30 years old, imagine that? But the diaphragms on Z1's site retail for $94! Each! So, my question is, how do I know if they are bad and causing slide sticking, etc?
 
It's easy to see if they are sticking, just try to move them up and down. :o

The other problem that diaphragms might have is holes. To inspect for holes, just gently stretch the diaphragm and hold it up against a light. Slowly rotate the diaphragm to look for holes all the way around.

This is what you don't want to see.

IMG_3028.jpg


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Thanks for that great photo. I don't know if that is what is the problem is. They do appear to be wrinkled and a little swollen or stretched. I was hoping to be able to see if they stick while the carbs are still on te bike.
 
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