Honda-SOHC
SOHC.co.uk Forums => CB350/400 => Topic started by: zombie365 on March 21, 2021, 12:11:47 AM
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Hi All,
My 400/4 is pretty much striped down now, time to refurb some parts!
I have access to an ultrasonic cleaner and wanted to clean up the carbs, mainly just for aesthetics, engine was running sweet as a nut before strip down, so I believe the carbs are working as they should.
I've not worked on carbs before so I thought id ask somebody first...
Can I just "chuck" the carbs as a whole in the tank and turn it on? or do I need to dismantle anything before?
It has pod air filters which will obviously be removed.
Hope I don't get to much stick for my noob question! Ha! :D
Cheers
Sam
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I usually dismantle the carbs but leave the bodies attached to each other as a single unit.
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Hi Sam,
Welcome to the mad world. No stick given on this forum for any question from someone willing to learn! We were all newbies once and everyday is a school day for all of us.
Depending on how bad a set of carbs is, the bare minimum for me is float bowls off, floats and jets out, ultrasonic bath and reassemble and bench sync - BUT! there are seals between carbs which might not have leaked before but could be 40+ years old.
This US guy Rick has an excellent write up of the whole job and you can do less or even more if you wish.
http://www.vintagebikebuilder.com/cb350-400f-carb-rebuild-demonstration.html
Ian
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I had some trepidation when I stripped down & rebulit my carbs - I found U tube videos a useful reference source but can't find a link to the one I used.
My BiL did the ultrasonic bit of the carb bodies after I had stripped them down.
Looking back at an old thread I did make some basic errors when re-assembling but it was sorted here!
Turned out a stripped thread was nothing of the sort I was just trying to put it back together all wrong.
This video helped me.
https://www.youtube.com/watch?v=JFTOfYl5BSc
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I stripped the carbs completely - following the same link posted above from orcadian http://www.vintagebikebuilder.com/cb350-400f-carb-rebuild-demonstration.html - really easy to follow guide - I had never stripped carbs before and to be honest was really daunted by it - in the end - really enjoyed learning how to do it -
I purchased a small 3 litre ultrasonic machine that I used for all the small brass components - and put a liquid dishwasher tab in the water as a detergent/cleaner - worked really well at 30mins cleaning - then the bodies, caps, float bowls I used a big industrial size ultrasonic machine at work - although just a warning - it turned the bodies a darker grey as a result of the process, I then had them professionally vapour blasted and they came up like new - I also had to rebuild a couple of times as I couldn't get the aftermarket float valves to seal properly resulting in leaking carbs - once re-fitted (cleaned) OEM parts all OK- good luck with it -