SOHC.co.uk Forums > CB750
Hanging idle please help
JezzaPeach:
Just another obscure random thought! Is the choke lever catching on the breather pipe. (my 500 did yours my not apply)
K2-K6:
At least you've now got a postive identification on the cause.
The little rods from outside to inside of the slides can get a bit "gummy" so worth a spray of lubricant there to see if it improves and helps you diagnose.
They should be clean and run dry though ultimately, along with the rubber boots to keep them clean and avoid impairment. You see many without the boot but they are important and effective.
Another is to clean the polished slides with something like turpentine substitute to degrease, and just dry them with a clean cloth, the carb venturi too along with the slide bore ( you really need slides out to properly inspect and clean this way thoroughly).
Wenman:
I’m pretty confident the internals are clean and gum free, I stripped them down prior to rebuild and there was nothing untoward.. plus I’m a sucker for carb clean so they would have had a fair share of it.
Is there anything that may cause this effect when the engines running like vacuum?
Only it dosent repeat the fault when the engines off.. they seat well and quick. Only does it when the engines running?
Thanks for all your replies.. together we will sort it!!
Alan
K2-K6:
Ok, in that direction of "oddness" what have you ended up at when setting the idle mixture screws?
Projection to try and see if if makes a difference, turn the mixture screws IN a quarter turn from where they are, this should slow the tickover down ( makes it richer) forcing you to wind up the main tickover rpm control for the carb rack to bring it back up to normal level.
Let us know if that changes it.
JezzaPeach:
Is it possible for the return spring to bind in its shroud (if it has one )?
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