SOHC.co.uk Forums > CB350/400
More carb troubles, engine won't return to idle revs
McCabe-Thiele (Ted):
Reads like the throttle closing cable is not working as it should at the carb end - I made sure there was some slack in the cable so it closed off fully.
Could it be the heat of the engine is making the cables bind?
Bryanj:
Does sound like closing cable to me as well, if you twist the throttle the wrong way(forwards) after you let the throttle go do the revs come down, there is a spring loaded bit on the operating mechanism
Oddjob:
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.
billdn:
--- Quote from: Bryanj on October 09, 2022, 01:50:48 PM ---Does sound like closing cable to me as well, if you twist the throttle the wrong way(forwards) after you let the throttle go do the revs come down, there is a spring loaded bit on the operating mechanism
--- End quote ---
Thanks Bryan , did think that too but doesn't make any difference. Also adjusted both cables but made little difference. Also made sure choke screw was not operating choke.
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.
billdn:
--- 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 .
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