SOHC.co.uk Forums > CB350/400
More carb troubles, engine won't return to idle revs
billdn:
--- Quote from: billdn on October 09, 2022, 02:19:02 PM ---
--- Quote from: Oddjob on October 09, 2022, 02:08:38 PM ---Try disconnecting the cables completely. Rev the engine using the butterfly by hand and see if it still does it. You'll need a remote fuel supply to do it though.
--- End quote ---
You don't like me do you 🤣
Worth a punt though. Given up Haynes manual (sorry Bryan) reference to 56mm distance on closing throttle to end .
--- End quote ---
Interesting, cables disconnected but still same issue and again could be resolved by pressing on top of sliders on 1 and 2 carbs.
Not quite sure what's incorrectly aligned but must be something of that sort 🤔
Carbs off again !
McCabe-Thiele (Ted):
Incidentally though as I was pushing/ prodding stuff I did note that if I pressed on brass caps on sliders on 1 and 2 carbs revs did settle, almost if not quite returning down after operating.
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That sounds like you have found the problem area.
Have you overhauled the carbs previously ?
billdn:
No, this first time off since I've had bike, only did it as waiting for rebore etc. And thought ideal time , any ideas Ted?
McCabe-Thiele (Ted):
Mine were seized up solid when I bought my 400. I had to soak the carb bodies in a series of solvents - Petrol, Acetone & ,carb cleaning spray to get them to move a mm. I suspect you just need to clean the sliders up properly by removing them fully - you could remove the slider top caps & use some carb cleaning spray if a full dismantle is too difficult or inconvenient.
There is a spring loaded mechanism that has ball cups at each end that can gum up as well.
Bryanj:
Just rebuilt comfysofas carbs and noticed that on the 400 set i had to start the bench sync with the adjusters screwed up a bit or the idle screw lever would not touch the bracket and the choke did not operate the high idle lever.
My instruction were written for the 500 carbs which dont have thehigh idle so that could be a problem, sorry
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