SOHC.co.uk Forums > CB350/400
More carb troubles, engine won't return to idle revs
Oddjob:
Any chance of a small crack in the rubber insulator?
Sesman:
--- Quote from: Scottish Badger on November 15, 2022, 05:32:40 PM ---Sesman, yes, fully stripped for ultrasonic cleaning and all ports blasted through with compressed air afterwards.
--- End quote ---
Hi Bill. That might not do it. The pilot jet pathways are threefold and blasting air down the drillings without blocking of the other two holes will allow the air to,take the path of least resistance. I had this problem with my 550 F2 and had to deliberately force air down each passageway. I found the smallest drilling entering the carb Venturi just after the slide was the problem
SteveW:
Would a seized up advancer unit cause this issue?
I was just looking online about cleaning and greasing them up. One article said it can cause hanging idles.
billdn:
Good thought Steve, googled the video and maybe might be problem. I'll try that as well , once I've reassembled carbs. Cheers for tip.
billdn:
So carbs ultra sonic cleaned and all jet holes clear and reassembly about to begin along with new o rings etc.
A question has been put to me by a friend that after bench syncing I'd still need to balance carbs, the impression I gleaned from BryanJ etc al was that a good bench sync should be near enough. Is my failure to do carb syncing after causing my problem of not returning to idle?
Haven't got that far yet but maybe why.
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