Carb. Inspection / Cleaning

[tsal]

one last thing, there is a hole in the slide, that I "think" was facing the back (air box side) but cant remember for sure. I had the diaphragm off, so i couldn't use the tab on it as a guide. does it matter which way it gos in?  

Tony

The way I read your question - you are unsure if you put the diaphragm back on the slide 180 Deg out so that although the diaphragm tab would fit in the carb body indentation the slide could be back to front.

If that is the question the answer is the vent hole in the bottom of the slide faces towards the engine. I've never had my diaphragm off so I'm having to assume mine are correct.  I don't know for sure if it even matters.

Just checked around to be sure I was correct and as ever the 'Bum'
has every bit of detail covered. The hole does face towards the engine.

Barry,
Thanks! Yes, that's exactly what happen. When I reinstalled the diaphragm, I was unable to find the notch on the slide that the inside tab on the diagram fits into as it is under the plastic ring. The only other reference point on the slide was the hole that runs through it. Without knowing which way that hole faced, I had a 50/50 shot of getting diaphragm on it correctly. I was indeed 180 deg out.
Tony    

[Rob Valdez 79 R65]

When I reinstalled the diaphragm, I was unable to find the notch on the slide that the inside tab on the diagram fits into as it is under the plastic ring.

Don't you look for the notch before pressing on the white ring?

[tsal]

Don't you look for the notch before pressing on the white ring?  

Pressing on the white ring???...........
 
Boy, do I feel like a complete idiot!!  I did not realize that ring came off! When I fist took out the slide. The diagram just about fell off it.   This being my first time, I figured it just sat in the grove between the slide and ring.  

 I now realize the diagram had come out of its proper grove on the slide and was not seated properly. (maybe what was causing that carb to act up?) It must have been like that for awhile because the inside of the diaphragm is deformed to the point it will no longer fit in the proper grove.

Ordering new diagrams from Bing.

[Rob Valdez 79 R65]

Order two new white rings, also, and ask them for their advice on heating the rings up prior to installation.
Also ask which side is supposed to be UP.  I put the flat side UP.  (see gallery, below)

New rings are a VERY snug fit.  

You want to be careful to have the diaphragm lined up when you snap it on.

The rings are not meant to be re-used (too many times!), and until just a few years ago, they were not available as a separate item.  Bing wanted you to buy a whole new slide when you wanted a new diaphragm for the flat-top carbs.  


You are correct in your assumption that a loose diaphragm, or one with a hole (even pin-sized) or tear will affect performance.  Usually, keeping the engine from revving beyond 4000 RPM.



Here is my tale of woe.  One of mine kept coming loose, but there was a rally a few States away that I really wanted to try for.  So I bought some silicone sealer.  Nah......

click on the picture for gallery:

[tsal]

Order two new white rings, also, and ask them for their advice on heating the rings up prior to installation.
Also ask which side is supposed to be UP.I put the flat side UP.(see gallery, below)

Rob, Thanks for the pics, and especially the tip on getting new rings with the diaphragms.  You must have read my mind because the next question was going to be which way the ring should face. My ring was with the lip facing up and was a very loose fit. Thought for sure the lip should face down like you have yours. It seem to fit much better that way. But when I spoke with the Bing Agency today to order the diaphragms and rings, they told me the lip should face up and smooth side down.
Tony

[Rob Valdez 79 R65]

Yes, always ask folks like Bing.  Don't trust even people like me who take pretty pictures and appear to know what we are talking about!  [smiley=bmw_smiley.gif]


Did you see in the gallery where I measured the inside of the old and new rings?

Old Ring - 36.25 mm
New ring - 36 mm

[tsal]

Just wanted to thank everybody here for your help. Finally got the new diaphragms and clips in, and the bike starts and runs 100% better now.
Temp is going to get up to the freezing mark today, so going for a ride
Tony