SOHC.co.uk Forums > CB500/550
After the Air Clearner its now the carbs - should I re-build
andy_c101:
Hi Keith,
It was a few years ago that I stripped, cleaned and rebuilt my PD carbs on my 550k3.
I recommend new gaskets for the float bowls, deffo.
I've not seen that top gasket issue with holes out of place. You may be able to punch out a new hole; and leaving the odd hole redundant (but you can judge that easily by removing a top cap to inspect the ports).
Just to share my experience with PD carbs....
I thought/hoped a thoroughly good clean would do the trick.
But alas, I could NEVER achieve a steady tick-over and always ran VERY lean.
To cut a long story short.....
I bought & fitted new Float Needle Valves,
I set Float Height to 14.5mm (both of these are a MUST),
By all means ultra sonic clean the carbs. But don't bother trying to clean/ultra sonic or solvent clean the Slow jets, they are just too tiny.
NEW Slow Jets "#42" were a MUST for me, & instantly it produced a steady tickover!
[some sources say "#38" Slow Jet, but go for #42].
Set Pilot Jets to "1+1/2 turns out" from closed.
For top-end running, I increased the Main Jets to "#95" (from #90) to cure the lean running.
I left the Needles and clip positions unchanged, middle pos'n#3
[I bought my Jets from SCI www.siriusconinc.com - before DSS & CMSNL had anything]
One final piece of advice, DO keep the set of four carb bodies all linked together as one assembly; you can still work on each carb, alongside each other.
Oh & after many grazed knuckles, I could get that bank of carbs out and back into the bike within 2 hours! (just don't ask me 'how' now!)
Good luck & persevere!
keithtraffic:
Thanks All.
Andy, what's the problem with splitting the carbs - I can see that splitting all four is a problem as it is necessary to remove the choke assys but is there an issue in splitting them 2 and 2. I am not sure that all four will fit into my ultrasonic cleaner and I do want to give them a good clean.
simonc:
I think what Andy is saying is you don't need to split carbs, remove all the smaller parts jets etc and float bowls all will fit in small ultrasonic bath. I tend not to split unless I have to, I use air for orifices in bodies, clean clean clean
deltarider:
I can't see why one would want to separate the carbs. The 'slow moving parts' do not wear, nor do they require maintenance. But, if you must... have to warn you... this is what you're $#@&!! looking at. Excuse my French. ;) http://www.cb500four.com/fofo_cb500four/viewtopic.php?f=16&t=623
andy_c101:
--- Quote from: keithtraffic on April 28, 2020, 07:53:16 PM ---Thanks All.
Andy, what's the problem with splitting the carbs - I can see that splitting all four is a problem as it is necessary to remove the choke assys but is there an issue in splitting them 2 and 2. I am not sure that all four will fit into my ultrasonic cleaner and I do want to give them a good clean.
--- End quote ---
Keith,
I just didn't want the hassle of re-aligning the slider/choke linkage nor the fuel transfer lines/seals...
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