cb400 cv carbs and pods - How to make them work. - Page 26
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Thread: cb400 cv carbs and pods - How to make them work.

  1. #251
    Super Moderator longdistancerider's Avatar
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    Don't beat yourself up, you caught the error and fixed it. Get the carbs sync'd and the mixtures set correctly before trying to solve anything else. That may fix it all but there's no way to fix it if the basics aren't correct
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 survivor restoration

    SALE IS ACTIVE TILL 200 SHIRTS SOLD T-shirt sales supporting 66Sprint's Land Speed Record Build http://www.hondatwins.net/forums/22-...d-attempt.html

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  2. #252
    Junior Member poorracerkid's Avatar
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    I'll work on that later this week. I replaced the O rings. They were pretty trashed. It's supposed to be cooler soon and will be good garage weather. I am just glad that it runs a lot better now. Now to do a sync and set the mixtures.

  3. #253
    Junior Member FearlessCustom's Avatar
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    Can someone tell me a startersetup for my cm400?
    Just so i can start somewhere and set it up further.
    I dont know what the PO did with the setup, it was not running when i bought the bike.

    I run straight pipes (no baffles at the moment)
    My pods are cheapo's....BUT!!!! Withouth the construtive inner lip, wich blocks the airports on the back of the carb!!
    I think that that is the main problem for bikecarbs running like crap with pods...you don't need a tube, just cut out the airports out in the rubber lip!!!
    I have had 2 cars with bikecarbs on them, and with cheap air filter pods. They ran like crazy once i got the setup right.
    '80 cm400t bobber

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  5. #254
    Super Moderator J-T's Avatar
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    The first few pages if this thread are good guide to get started. I'd maybe start by going up 2 sizes on the primary main jet and 1 size on the secondary main jet, then start doing plug chops. Depending on the year of your bike you can find the stock jetting here:

    Carb Information: Years, Jetting and More

    Beyond just being uncovered those ports require that your pods provide smooth airflow over them so you may need to do a bit of work there.
    JT
    81 CM400T Under re-construction
    82 GL500

  6. #255
    Junior Member FearlessCustom's Avatar
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    Thank you!

    my carbs are the vb22's, now i know what is original and what's not.
    '80 cm400t bobber

  7. #256
    Super Moderator longdistancerider's Avatar
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    The ports you're referring to are what actually causes the piston to rise, air pressure vs. vacuum. So a consistent smooth flow of air is ness'y for them to work
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 survivor restoration

    SALE IS ACTIVE TILL 200 SHIRTS SOLD T-shirt sales supporting 66Sprint's Land Speed Record Build http://www.hondatwins.net/forums/22-...d-attempt.html

    http://www.hondatwins.net/forums/22-...d-attempt.html and http://www.hondatwins.net/forums/1-p...r-attempt.html
    Road Trip http://www.hondatwins.net/forums/11-...here-i-go.html or "where's Jim now?"
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  8. #257
    Junior Member poorracerkid's Avatar
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    Got a chance to do some more work on the carbs. I got them balanced and the needles adjusted. Now high idle is right at 3k and sometimes will drop to a nice 1200 once warmed up. Still having the same issue with the idle sometimes not dropping back to 1200 after a quick ride or a quick rev on the driveway. It just seems to go right back to the exact same rpm as the high idle. This has me thinking if the high idle lever operated by the cam on the choke linkage is somehow getting stuck on. I moved it back and forth with a screwdriver and there seems to be almost no spring tension on the high idle lever. Could this high idle control be getting stuck "on" after revving the engine up and not allowing the idle to settle back down. Eventually it does seem to go back down but can take up to a couple minutes. Or if I play my loosening and then tightening the idle screw on the left carb that seems to bring it back down (and then back up when I turn the screw back in).

  9. #258
    Super Moderator longdistancerider's Avatar
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    After cleaning the carbs sometimes the fast idle cam will start sticking because the lubrication got removed, small squirt of oil should free it up. Cables being a little too tight can cause this also
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 survivor restoration

    SALE IS ACTIVE TILL 200 SHIRTS SOLD T-shirt sales supporting 66Sprint's Land Speed Record Build http://www.hondatwins.net/forums/22-...d-attempt.html

    http://www.hondatwins.net/forums/22-...d-attempt.html and http://www.hondatwins.net/forums/1-p...r-attempt.html
    Road Trip http://www.hondatwins.net/forums/11-...here-i-go.html or "where's Jim now?"
    Member Map http://www.hondatwins.net/forums/dcMembermap.php

  10. #259
    Junior Member poorracerkid's Avatar
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    I think I found the problem. It's not the cables or fast idle cam. It appears to be a vacuum leak on the port side where the carbs meet the insulators. After getting it good and warmed up I used some carburetor cleaner and when I spray the bottom of that connection the engine momentarily revs. Once it cools off I'll take the carbs off again and see if I can't find something that looks suspicious. Jim, I appreciate greatly all the help you have been to this community and myself. You're a great knowledge resource and have given me a lot of really good advice both here and in other posts/threads I've read on this forum.

  11. #260
    Super Moderator longdistancerider's Avatar
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    First check that the carbs were fully installed into the insulators, they actually bottom out against one another. If they are originals then get new ones.
    Jim O'Brien
    1979 CM400T "road bike" modified for travelling
    1978 CB400T1 restored
    1972 CL350 survivor restoration

    SALE IS ACTIVE TILL 200 SHIRTS SOLD T-shirt sales supporting 66Sprint's Land Speed Record Build http://www.hondatwins.net/forums/22-...d-attempt.html

    http://www.hondatwins.net/forums/22-...d-attempt.html and http://www.hondatwins.net/forums/1-p...r-attempt.html
    Road Trip http://www.hondatwins.net/forums/11-...here-i-go.html or "where's Jim now?"
    Member Map http://www.hondatwins.net/forums/dcMembermap.php

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