The New And Improved Unofficial R65 Forum V2
Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: Crossrodes on July 17, 2010, 05:33:15 PM
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I have a '79 with flat top Bing carbs. It's shown on the parts fiche for my bike. For the life of me I can't figure out how to remove and install the new diaphragm. If anyone with a flat top carb has done this with this carb could you please tell me how I do this.
The slider has what appears to be a big plastic "O ring" on top. The inner part of the diaphragm sits under this "O Ring." It appears that I somehow have to remove the "O ring" but it is held in place by what appears to be a collar that appears to be part of the slider body. It may be that this collar is threaded inside but I can't move it.
Anyone done this that has the answer?
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There's a plastic ring that needs to come off, to get the diaphragm off .
I think you need to warm the ring up with a hair dryer, or something similar, to make it a bit more pliable .
Rob Valdez has done this with his carbs, from what I can remember, the plastic ring is not widely available here in North America .
Hopefully he'll see this and get you the info you need .
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Bob, from what you remember was Rob able to reuse the plastic ring after it was removed with heat? I have to call Bing on Monday so if I need them I'll order them at that time....Believe it or not I found that I had no float needle in this carb. How it ran I'll never know. I don't recall any flooding problems and never smelled gas.
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Bob, problem solved. I decided to see if I could pry the plastic ring off with a large bladed screwdriver. It popped right off...no heat required. So then I fit the new diaphragm carefully and popped the ring back on using the palm of my hand...No problemo.
It's amazing what you can do with a little help from your friends. Thanks Bob.
Mike
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Mike,
Sorry I didn't see this one till now.
You did right - pry it off. I reused mine until one wouldn't stay in place any longer. By then, Bing Agency USA was selling the rings. You should call and buy a couple for the future. They are not expensive.
The man at Bing suggested I boil the ring for a little while to make it go in place easier. I did, but I don't think it made much difference.
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Mike,
Just make sure you put the ring on so the smooth side is facing up. This holds the diaphram in place more secure than the other way. I learned the hard way when I started to hear a whistle and loss in power. I found I had the plastic piece smooth side down and the diaphram wiggled out from underneath it allowing a leak.
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Mike,
Just make sure you put the ring on so the smooth side is facing up. This holds the diaphram in place more secure than the other way. I learned the hard way when I started to hear a whistle and loss in power. I found I had the plastic piece smooth side down and the diaphram wiggled out from underneath it allowing a leak.
Old on left, new on right:
(https://bmwr65.org/smf/proxy.php?request=http%3A%2F%2Fwww.pbase.com%2Ftomfarr%2Fimage%2F80793349%2Fmedium.jpg&hash=2b18be9299de03dad718266ce045e0507705ec34)
(https://bmwr65.org/smf/proxy.php?request=http%3A%2F%2Fwww.pbase.com%2Ftomfarr%2Fimage%2F80793399%2Fmedium.jpg&hash=887129cb7b3de8fbf93ec35f46029ed836f04f4a)