R60/6 Bing slide carb dismantle question

[mattsz]

Carb cleaning day!

No problems, except I cannot figure out how to remove the insulating bushing (and washer beneath) at the head inlet side. Is it some kind of plastic or fiber? Any ideas for removing without destroying it and reusing it?

[JonnyCash]

Hi Matt. Have you tried a heat gun to expand the aluminum, or pot metal, or whatever the carb body is made of? If you don't have a heat gun, boiling water can work well too. I've never dealt with these.

[mattsz]

No - Rusty at MAX said he basically never sells these things - people rebuilding carbs don't seem to need them. I took a chance and soaked them with the rest. We'll see what happens...

[mattsz]

Any kind of lubrication required or suggested for any of these parts?



I'm guessing not (gas and most lubes don't mix!), but my old idle jet o-rings were toast, and I don't want to kill the new ones on reassembly...

BTW, not the best photo, I know, but this is pre-soak...

[JonnyCash]

I like to use two-stroke oil, but I always have it around for the RD. I don't think it matters too much. Spit would be fine. Funny, I'm doing this same jobs too, on the Guzzi.

[mattsz]

I can't wait to see that thing in action!!! Thanks again for your help...

[JonnyCash]

I enjoyed working with you, and I'm glad it helped. That's a super nice bike, you did very well.

[ignatz72]

I've used plumbers grease, also called vacuum grease on the o-rings. These are clear silicone greases. A thin coating helps o-rings slide over jets, etc instead of tear on the threads. Others will probably mention using tape over the threads, and silicone grease will help here too.

[mattsz]

Originally Posted by ignatz72

I've used plumbers grease, also called vacuum grease on the o-rings. These are clear silicone greases. A thin coating helps o-rings slide over jets, etc instead of tear on the threads. Others will probably mention using tape over the threads, and silicone grease will help here too.

Hi Iggy-

Tape, as in plumbers teflon tape? Silicone grease on *all* threads, or just on those with o-rings?


Some other questions...


--- My Clymer manual says to remove the "plunger" from the accelerator pump housing, but doesn't say anything about dismantling it further. After cleaning, I noticed that it seemed to have some sort of check-valve function, so I looked into the Bing Carb booklet, which shows the "piston" as having a "valve" and a "reed". I removed the valve from the piston to find the reed inside - everything looked clean, so I buttoned them back up. Functionally, I find when I blow into one end, air flows freely, but when I reverse the flow, the reed "chirps" just a bit and *almost* seals, so I get just a small amount of flow. Each unit behaves the same way. Sound normal?



--- The springs from the accelerator pump "plunger" (Clymer) or "piston" (Bing) on each carb are different:



That's correct, the left side spring is broken! I didn't find any extra spring bits inside, and by the way the spring was gripping the end of the plunger/piston, I'd say that the last person to dig into these carbs stretched the spring and stuck it back in. I'm guessing that this should be replaced?



--- Finally, the float needles - they both seem to be just the same:



Where it seats is shiny, but it doesn't appear damaged or scored - to my eye, nor to my fingernail when I drag across it to feel for scoring - is that enough of a check?

[Bill Harris]

Some other questions...

--- My Clymer manual says...

13 11 1 255 816 accelerator pump 50/5, 60/5-7 $ 58.00

[ignatz72]

Originally Posted by mattsz

Hi Iggy-

Tape, as in plumbers teflon tape? Silicone grease on *all* threads, or just on those with o-rings?

Tape, as in vinyl electrical tape or similar, which will be removed after the o-ring is seated. I don't think teflon tape is rated for gasoline, and you don't want it turning gunky inside your carbs. I have used teflon tape on the petcock threads and it seems to work fine, but I wouldn't use it inside my carbs.

And I used the silicone grease just on the o-rings themselves, although a bit on the threads probably wouldn't hurt. I would remove as much of the silicone as possible from the jet threads when you are done though.

[mattsz]

Originally Posted by Bill Harris

13 11 1 255 816 accelerator pump 50/5, 60/5-7 $ 58.00

A whole new assembly just to replace that little spring? You're joking, right?

Why do I get the feeling you're not joking?

Originally Posted by ignatz72

Tape, as in vinyl electrical tape or similar, which will be removed after the o-ring is seated. I don't think teflon tape is rated for gasoline, and you don't want it turning gunky inside your carbs. I have used teflon tape on the petcock threads and it seems to work fine, but I wouldn't use it inside my carbs.

And I used the silicone grease just on the o-rings themselves, although a bit on the threads probably wouldn't hurt. I would remove as much of the silicone as possible from the jet threads when you are done though.

Gotcha! I can manage that... Thanks!


I think I've got a $50 roll of electric tape around here somewhere (Bill was joking, right? sigh...).

Anybody have some Bing slide carbs they're parting out? Anyone? Anyone?

[Hedge36]

You know those little tubes of sewing machine oil with the needle tip? Those are great for carb reassembly

[mattsz]

Just heard from Rusty at MAX. He stocks the springs - for $3.75!!

Any comments on my float needles or reed pistons? Think they're re-usable?

Forgive me, but I really don't know how most of these parts contribute to the job they do. Is it imperative that I replace that broken spring? What kinds of problems might I expect to experience with using that bad spring - one that I assume has more force due to its being stretched - fewer coils per the same length of spring.

I've been having a multitude of little problems, all diagnosed here on this forum as having numerous possible causes and solutions. Now, we're sort of looking at it from the other direction - here's a specific problem, what kind of symptoms would it cause?

[mattsz]

Originally Posted by Hedge36

You know those little tubes of sewing machine oil with the needle tip? Those are great for carb reassembly

Well, I have one of those, too!!!