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Thread: Rebuilding VB Carbs

  1. #201
    Cal
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    Quote Originally Posted by 80cb400t View Post
    for a set of 2 carbs (with an accelerator pump, but I don't think you have one) the replaceable rubber bits include:
    fuel crossover tube o-rings (2)
    accelerator pump crossover o-rings (2)
    accelerator pump to carb body o-ring (1)
    air cut o-rings (2)
    mixture screw o-rings (2)
    Then the plugs that go in above one of the jets in each carb (2), the accelerator pump baffle (1), accelerator pump diaphragm (1), air cut diaphragms (2) and float needles if needed (only from Honda, aftermarket are the wrong length)
    hopefull I'm not forgetting anything else
    Thanks 80cb. You're right, there is no accelerator pump, so maybe? all I need are the
    fuel crossover tube o-rings (2)
    air cut o-rings (2)
    mixture screw o-rings (2)
    Then the plugs that go in above one of the jets in each carb (2), and the float needles?
    1979 Honda Hawk CB400 T1

  2. #202
    Super Moderator J-T's Avatar
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    OK, as you disassemble the carbs, each time you remove a seal/gasket, find the one in the kit that matches. Put it in a little teeny zip lock bag and label it as to where it goes. Likely you'll have some left over, don't worry about it.
    JT
    81 CM400T

  3. #203
    Senior Member 80cb400t's Avatar
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    That's what I'd think but I've never had a set without an accelerator pump to say for sure. I will say from personal experience that getting the honda kits is the easy way to go, getting the o-rings yourself risks having to redo the carbs several times. It's not that hard to do repeatedly but if you are in any rush it can get real frustrating
    Cal likes this.
    1980 CB400T - 1 running, 1 parts bike
    1965 CB160 - 1 kind of running, 1 parts bike

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  5. #204
    Cal
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    To repeat what many have said: Wow what a great thread longdistancerider. I am moving along on this rebuild project, and have 2 questions:
    1) What do I do if I can't remove the emulsion tube? The one under the primary jet where you have to make a 4mm screwdriver.
    2) When re assembling the whole carburetor, how tight to tighten all the jets? Thank you
    1979 Honda Hawk CB400 T1

  6. #205
    Super Moderator longdistancerider's Avatar
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    There are times where that emulsion tube is frozen. In those cases I run the carb thru the ultra-sonic unit 3-4 times blowing it out with carb spray in between. That's been successful to date.
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 survivor restoration


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  7. #206
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    Thanks Again LDR. I just wanted to be sure there was no rubber (o ring) under the emulsion tube that would disolve. And along that same line, can you think of any other hard to reach/hard to see rubber parts that might be hiding in the carb? I want to make sure they have all been removed before the major soak.
    1979 Honda Hawk CB400 T1

  8. #207
    Super Moderator longdistancerider's Avatar
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    There's no hidden rubber parts, all the rubber is used for external sealing of parts.
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 survivor restoration


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  9. #208
    Senior Member 80cb400t's Avatar
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    The only one I ever missed was the mixture screw o-ring and washer that can get left behind if they're old
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    1980 CB400T - 1 running, 1 parts bike
    1965 CB160 - 1 kind of running, 1 parts bike

  10. #209
    Cal
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    Quote Originally Posted by 80cb400t View Post
    The only one I ever missed was the mixture screw o-ring and washer that can get left behind if they're old
    Yes. I almost missed that one too, but I did get lucky and noticed it. And it's good to know that there are probably no others. Thanks guys.
    80cb400t likes this.
    1979 Honda Hawk CB400 T1

  11. #210
    Cal
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    So I removed my VB 21 Carburetors, and noticed something was wrong. Things Looked pretty good in there, but the piston did not travel freely inside the carb. In fact it was more or less frozen. And I can't remember if it was stuck in the Up, Down, or somewhere in between position, but it sure wasn't moving. How would this effect the bike? Would it prevent the bike from starting?
    1979 Honda Hawk CB400 T1

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