SOHC.co.uk Forums > CB500/550
I need a carb sync - Anyone in North London?
michtag:
Thank you K2-K6, just for the sake of elimination I will try that (the breather tube on my bike goes back to the bottom of the airbox) but I really hope it will make no difference!!
cheers
paulbaker1954:
One thing I would like to add.....
I know how frustrating it can be chasing problems like this, I spent weeks chasing around with an issue that I thought was down to air leaks (but wasn’t in the end). My bike had never idled very well and was always quite and to start despite having rebuilt the carbs and changed the carb brassware.
In the end I got so fed up I bought a set of refurbished carbs from Gerben. Ok they cost 300 but I got 95 back in part ex for my old ones.
Result bike starts first kick, idles like a dream.
Sometimes it just pays to have a professional service the carbs that uses good quality brassware was my take home
Mine is a 500 by the way with 069A carbs not a 550.
michtag:
--- Quote from: paulbaker1954 on September 17, 2020, 08:01:17 AM ---One thing I would like to add.....
I know how frustrating it can be chasing problems like this, I spent weeks chasing around with an issue that I thought was down to air leaks (but wasn’t in the end). My bike had never idled very well and was always quite and to start despite having rebuilt the carbs and changed the carb brassware.
In the end I got so fed up I bought a set of refurbished carbs from Gerben. Ok they cost 300 but I got 95 back in part ex for my old ones.
Result bike starts first kick, idles like a dream.
Sometimes it just pays to have a professional service the carbs that uses good quality brassware was my take home
Mine is a 500 by the way with 069A carbs not a 550.
--- End quote ---
Hi Paul, yes, I have been tempted to go down that route myself, but if I spent that kind of money on my bike (again) I think my wife would show her disappointment by poisoning my coffee or reshaping my head with a blunt instrument.
So I will try to play with the advance springs and see if I can get it to stabilise somewhat enough to proceed with using a strobe light and then syncing properly.
Ideally I would like to try another set of PD carbs before committing to buy a refurbished set, so at least I can have a reasonable certainty that they are the problem.
Cheers
deltarider:
Listening to that video, does that ultra short high chirping sound, every now and then, not indicate some electric shorting? Or is it just the keys vibrating on the handlebars? I suppose there's no harm in checking if there's any intermittent arcing going on between plugcaps (and/or HT leads) and the head. Best seen in the dark.
michtag:
--- Quote from: deltarider on September 19, 2020, 07:55:03 AM ---Listening to that video, does that ultra short high chirping sound, every now and then, not indicate some electric shorting? Or is it just the keys vibrating on the handlebars? I suppose there's no harm in checking if there's any intermittent arcing going on between plugcaps (and/or HT leads) and the head. Best seen in the dark.
--- End quote ---
Hey Deltarider, thank you for your reply and apologies! I have noticed it only now, but I have put all this on the back burner since I was made redundant and completely stopped looking into it :/
Anyway, I had not noticed that chirping sound and it may just be the phone mic picking up or distorting something else (or maybe it's the keys) but I will try again in the dark to see if any sparks appear. having said that, I really doubt it as all plug caps are new....but who knows...coils and leads are still the original ones.
I have also managed to get new return springs for the advance mechanism, so I'll be able to test if those have any impact at all.
Failing all the above, I fear i will have to take the carbs down (again) and get them professionally cleaned to make sure everything is as clean and open as it should be.
many thanks
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