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

  1. #1
    Member lynjed's Avatar
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    cb400 cv carbs and pods - How to make them work.

    hi,
    just thought I would pass on my settings for those fitting pods.
    Firstly I couldn't get the carbs to work without stacks fitted before the filters - no problem cut some round 2" rain pipe at same length as the original rubber airbox ones (about 3") - warm the end with a hot air gun and pass the end over the carb bellmouth and let cool. Cut some slots and fasten to the carb with clips.

    Fit the pods over these and clamp on with clips - note the cheap pods will need to be a bigger size as you must get the little rubber shelf that's inside over the stack otherwise it disrupts the airflow. Better quality pods don't have this rubber shelf.
    The stacks smooth the flow and allow the cv carbs to work again as designed.

    Now you need one washer under the needle to lift it - the needle is non adjustable so when you do this, screw the needle retainer all the way down until it just touches the needle but allows the needle to still move - you will see when you do it- if you screw it fully down the needle gets locked rigid which wont work.
    Once your happy, that it moves but with no slack, spread varnish or glue at the top of the retainer to stop it coming loose.

    Now leave float heights stock and slow running screws too - rejet to mains 95 and secondary 127.5. - yes that's a big jump but trust me it works - result is fantastic - absolutely no flat spots or hesitation, backfires or spitting and power is full on, yet you can still do top gear roll on.

    Mine has a straight through pipe, so if stock you might have to drop to 90 and 125 if too rich. The midrange mains does need to be big though otherwise it will hesitate.

    So pods and cvs do work - ignore the doubters, but you need the stacks! - good luck!

    Administrater - move this to the frequently and hopefully people will stop asking!
    jasondkramer and STORMINS78 like this.

  2. #2
    Super Moderator longdistancerider's Avatar
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    Re: cb400 cv carbs and pods - How to make them work.

    This has been my thinking for quite some time. The airbox boot is functioning as a velocity stack, even the end of it is bell mouthed.
    So this has provided good clean drivability thru out the rpm range?
    Plug readings? Effect on fuel mileage?
    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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  3. #3
    Member lynjed's Avatar
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    Re: cb400 cv carbs and pods - How to make them work.

    hi,
    plugs are fine, bike pulls fantastic - believe me its take 3 months to get the jetting right, the midrange stumble took some solving, it really takes a large main to sort it.
    without the stacks, the carbs just would not behave at all.
    Regards gas mileage - I did this for power so its one AREA that's not a concern - anybody looking for mpg - stay stock.

    But it really does work and works well and the stacks are cheaply made in 5 mins - I will post a photo to show the result.
    j

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    Super Moderator longdistancerider's Avatar
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    Re: cb400 cv carbs and pods - How to make them work.

    I wouldn't do it to the road bike since cleaning filters can be a PITA when you're 1000 miles away from home.
    However the café is a different proposition, fast short runs. So who cares about mpg then
    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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  6. #5
    Member lynjed's Avatar
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    Re: cb400 cv carbs and pods - How to make them work.

    hers a photo of the simple stack - plastic pipe, end warmed up and forced over carb.
    filter must sit over stack with no obstruction - so make sure rubber lip of filter is not disrupting the airflow.
    j
    Attached Thumbnails Attached Thumbnails cb400 cv carbs and pods - How to make them work.-stack.jpg  

  7. #6
    Senior Member jbc2408's Avatar
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    Re: cb400 cv carbs and pods - How to make them work.

    Thumbs up! Great guide

    Does this also count for the CB 400 N model?
    Jesper BC - Copenhagen, Denmark
    80´Honda CB 400 N - 98.000 km
    73´Honda CB 450 - 75.000 km

  8. #7
    Senior Member jbc2408's Avatar
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    Re: cb400 cv carbs and pods - How to make them work.

    ... and do you have a photo of the work you did to the needle retainer?
    Which size are the washer you fit under the needle ( or does that matter?
    Jesper BC - Copenhagen, Denmark
    80´Honda CB 400 N - 98.000 km
    73´Honda CB 450 - 75.000 km

  9. #8
    Super Moderator longdistancerider's Avatar
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    Re: cb400 cv carbs and pods - How to make them work.

    These would be the correct shims http://www.jetsrus.com/individual_parts/009_396_su.html
    and yes this will work on the VB carbs found on the CM/CB 400/450 engines
    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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  10. #9
    Senior Member jbc2408's Avatar
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    Re: cb400 cv carbs and pods - How to make them work.

    Ok - roger that! and thx Jim!

    Since I have build my own batterybox, I have a litte problem fitting the pipe - simply not enough space.
    Will a 45 degree on that pipe disrupt the air-flow?



    (or do I have to make a new box?)

    Could these maybe do a decent job?
    http://www.z1parts.net/product/carb-vel ... -52mm-54mm
    Jesper BC - Copenhagen, Denmark
    80´Honda CB 400 N - 98.000 km
    73´Honda CB 450 - 75.000 km

  11. #10
    Super Moderator longdistancerider's Avatar
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    Re: cb400 cv carbs and pods - How to make them work.

    Those could work, unfortunately there's no information posted like length.
    Also the lip of them that mates to the carb throat has to be flush, no step up or down that'll disturb the air flow into the air bleed port.
    You still need air filters that will go over them.
    Nothing says they can't be turned outwards to clear the box. A little ingenuity and some hose?
    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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