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Hey guys. Would one of you mind helping me? I have taken my carbs out on my '81 CB750 Custom, cleaned them and rebuilt them. However, when trying to get them re-assembled, the choke mechanism isn't working properly. When I manually move it, it does not move the "butterflies" at all. I took pictures of the two choke arms and the spring that connects them when I was disassembling them. From what I can tell, my photos EXACTLY resemble the way that I have it setup right now, but it's still not working. I even compared it to any and all pictures that I can find online and it seems to be setup correctly. Any help or suggestions you can give would be GREATLY appreciated!
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Administrator
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Can you reach in and move the butterflies with your fingers? Do they move freely and snap shut easily?
It's super easy to bend the choke butterfly shafts and cause them to bind like this. Trust me,I know. 
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Hey shinyribs. Yes, I can move the butterflies with my finger. The shafts seem to slide in very easily, so I assumed they weren't bent and would not be the source of my problem. Any other suggestions?
Also, does it look like I have everything assembled correctly from what you can tell?
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Administrator
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Sorry bud,I don't see any pictures.
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CRAP! LOL. Guess that would've helped, huh? LOL
Here ya go...
  
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Administrator
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I think I do see something,but it's hard to tell in pics and I don't have mine here to reference.
The shaft from the 3-4 carbs has a sort of fork on the end where it meets the 1-2 shaft. Seems they engaged each other at that fork. Doesn't look that way in your pics.
Hope this helps. I'll snap a pic of mine when I can if you need it.
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Administrator
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It looks like the fork, and tab looking things are out of position, but they do not engage each other.
TOOLS
Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."
1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)
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Hey shinyribs. When you say "engage" each other at the fork, are you saying that the fork (the end of the shaft coming from the 3/4 carb) should sort of "straddle" the tab from the shaft on the 1/2 carb?
And yes, if you can post a picture of yours that would be FANTASTIC!!!
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Thanks Tools. So should I bend one of them? If so, which one?
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Administrator
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No do not bend them. Just reposition them. The spring should pull the No# 2,3 open. Place them in that relationship.
TOOLS
Life is not about the number of breaths, you take, but the moments that take your breath away.
I don't have an anger problem. I have an idiot problem. Hank Hill
Never confuse education for intelligence.
Happiness is a belt fed weapon.
I just can't imagine what could go wrong.
No fire? No explosions? So whats the point of your story?
Those who are too smart to engage in politics are punished by being governed by those who are dumber. ~Plato
It couldn't be done, but the darn fool didn't know it, and did it anyway.
We all got problems. Ksharp
I like vintage bikes because they take me away from the clutter of technology that I work with everyday and back to a simpler time of mechanical elegance and simplicity.. "ninadm"
Darkwing Duck: The worst part of public transportation is the Public.
"That is awesome shit there" Re-Run
"Fear nothing, attack everything" Eric Berry
" Oh, you read that on the internet? Clearly it IS a massive problem. Of course it CAN’t be normal operation."
1976 CB 750-A X 2
1977 CB 750-A X 4
1977 CB 750-K
1976 CB 750 F
1981 CB 750
1966 Kawasaki SG 250
1981 KZ 750 LTD
1973 CB 350
1979 CM 185 Twinstar
1982 Honda XL 80
South of Eden (Kansas City MO)
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Hmmm....Tools, what way should i reposition them? As far as I can tell, the spring and the arms are in the correct position compared to the manual that I followed and compared to the pics that I took prior to disassembly. I also compared it to pics that i've found online and it seems to be correct. Would you be able to better explain to me what type of repositioning you mean? Thanks Tools!!!
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you may also want to check and see if the paddles are rubbing on the interior walls. even if the tabs on the bars are aligned properly, this can screw up the action there. I think it's part of the reason that they recommend you put each paddle back into the same place you removed it from. (which, i tried to do, but swept them off the bench by accident before i could label them.) I only suggest this because I have mine apart at the moment and had a similar issue very recently and had to remove and replace them to find the correct configuration. If you see scuffing, you know that might be it. I'm no expert here and someone else please correct me if I'm wrong, but hopefully this at least helps eliminate a possibility if it's not the actual problem you have.
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Administrator
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That's actually great advice. I let mine get mixed up,too. Had to trial and error it back together like you said. Definitely a good thing to check.
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I'll check that also. Hadn't thought about it. Good idea though!
Anyone know what the spring is called? I'm wondering if a large part (or even a small part, but still contributing) of my problem is the spring. It's in pretty rough shape. I noticed it when I was disassembling the carb's. I've looked online for a replacement to purchase but can't find one. I figured if i could find out the actual name or part number, it might help with my search. I've tried to "re-wind" the spring that I already have but it's not working out so well.
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Administrator
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Aw shucks, I forgot to get a pic.  Are you talking about the thinner of the two springs? They always look funky. The one in your pics look about as crazy as mine do.
brb with pics....
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LOL...looking forward to seeing your pics. I need something good to compare it to.
I'm talking about the spring that connects the two choke shaft arms. One end of it connects to the shaft arm for carbs 1 & 2, and the other end connects to a little "notch" in the fork of the shaft for the arm that connects carbs 3 & 4. Mine seems to be pretty beat up, so i'm looking online for a replacement and am having NO luck.
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Shinyribs...thanks for posting those pictures. I still don't see how mine is any different though. I DO notice that my tabs seem to be bent a little differently than the pics that you posted (which I will fix). As far as shaft placement, tab placement, spring tightness, etc...I don't see any differences. If you can spot anything different, let me know! I'm WAYYYYY open to suggestions. I'm doing everything I can to not just get online and buy a new set of carbs (which i don't really have the extra $$$ for, but i'm just so damn frustrated). lol
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Administrator
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yeah, they do seem to be identical.  So everything moves freely? The cable just wont close the butterflies,right? Man,that's weird.
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Ok, like I already told you...this is my first EVER attempt at mechanical work. I mean, i changed out an alternator on a car here and there when I was a teenager (i'm 41 now) and some brake pads here and there over the years but that's about the extent of it. I can tell you right now...if i had to work on motorcycles for a living, I don't think i'd last very long. lol
I have NO idea how I did it or what I did differently, but the damn things are working now! WOO HOOOOOOOOOOOO!!! It took me until 1:15 AM before I finally got it right, but that's not the important part. Although i have NO idea what i finally did to get this damn thing to work...i really don't care. It's working and that's the important part! LOL
Thanks a ton for all of your help, suggestions, advice, pics, etc, guys. i sincerely appreciate it! Especially with me being not only a newbie to motorcycle maintenance and ownership, but also a newbie on this website, you guys have been fantastic. I read a LOT of other postings from different people on this website and I've yet to find anyone who was an asshole (sarcasm here and there doesn't count...lol). In today's world where people can hide behind their keyboards, that's hard to come by. So I definitely appreciate your help, but more than that, I appreciate you guys being "cool" about everything and not being arrogant. Especially since I can nearly guarantee you that i'll be posting more questions in the near future. lol
Thanks again, guys!
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