SOHC.co.uk Forums > CB750
Hanging idle please help
Bryanj:
I know i wrote it but it works and if all the mechanical service items are right i find the vac gauges are normaly within tolerance. Idealy if you have done all this and it runs ride it round till next service due, 500 if engine rebuilt 1500 if not, then do vacs AFTER doing rest of service items.
K2-K6:
I feel it's the best way to set them correctly Bryan, and probably better than vacuum gauges as it effectively calibrates each separate carburettor with exactly the same reference tool as opposed to introducing any gauge to gauge tolerances into the carbs.
It also very neatly has the advantage of being able to synchronise the carbs without any outside influence from the other components, which allows synchronisation to be taken out of the equation in problem diagnosis, and proceed with assurance that's not part of any running issue.
A very accurate way of achieving it.
Wenman:
--- Quote from: K2-K6 on July 03, 2020, 05:23:35 PM ---Push cable usually has no adjuster, so just fit and leave. But that one shouldn't give you a problem unless something is misplaced on brackets.
As it has an affect when you push the top of slides it may be that there's not a parity of the slide home position from assembly. Are you familiar with Bryan's bench synchronisation method? As that should remove an error like that if present.
--- End quote ---
Thank you so much!! And thanks to you Bryan as well..
So last night I whipped the carbs off and bench synced them using a red tipped welding electrode 1.6mm (1/16) adjusted all the floats again and went through the jets with a guitar string.
Popped them back on and it’s purring like a kitten.. idle drops back down responsively and it’s sounds great!!
I have the air/fuel mix screw out 1 turn and it seems bang on!
Not had chance to get her on the open road Yet but it’s a far cry from what I was dealing with!!
Once again this forum comes to the rescue! What would I do without you guys!
If you lived closer I’d get you a pint!!
I’ll keep you posted after the run out but needless to say I am very excited!!!
I’ll be clapping for you guys on Thursday night!!!
Cheers
Alan
Wenman:
Okay so went out for a ride today.. it seems a lot better but still getting the occasional hang up??
What is going on.. I’m at breaking point now.. feel like I’ve tried everything and not sure what direction to go.
The only thing I can think of is an air leak in the inlet rubbers but when I had the carbs off I inspected them all and they all looked good??
Don’t really want to start throwing money at it when I don’t know what the exact problem is?
Any more help would be appreciated if you guys/girls have any ideas??
Thanks
Alan
hairygit:
Unfortunately as you well know, pods are ALWAYS a compromise when it comes to carb set up. Honda spent a lot of time on R&D of the carbs/filter set up to suit the engine and standard exhaust. You are probably about as far as it can be sorted in it's current form, incorrect filters and incorrect exhaust both play such a huge part in the overall running characteristics of the engine. There is a school of thought around using part of the standard airbox to carb rubbers to act like a bell mouth inside the pod filter. It does something to help sort the airflow through the carbs, but I have no practical experience of this, but a couple of others on here have. Finding their posts may be the next move, rather than keep throwing money at it with no real benefit.
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