SOHC.co.uk Forums > CB500/550
idle jet differences , 069's
fogrider:
That's a useful chart, great details and part numbers, only missing the cutaway, mine are 2.5 for the 069a and genuine Keihins. Not sure about the others.
Looked at the old needles, correct part numbers. I'll have a critical comparison of the aftermarket ones, once I've got them out. Sincerely hope that that's it.
Regarding it going very rich top end, will have to check the hole size in the new mains, maybe they're duff too. If these latest changes cure it, I should be able to go back to standard ignition.
Had a belt around Notts and Lincs on the VFR for a day out, nearly 200 miles , a couple of great cafe stops, lovely cake in Tiggys in Epworth. Great ride out with an ex bike cop on his 1300 Pan.
Made a pleasant change from tinkering.
deltarider:
--- Quote from: fogrider on June 04, 2021, 06:41:03 PM ---... only missing the cutaway, mine are 2.5 for the 069a and genuine Keihins. Not sure about the others...
--- End quote ---
All CB500/550s have the same slides/cutaway.
--- Quote ---... Regarding it going very rich top end...
--- End quote ---
Expect to need 6% CO, to have it run right.
I don't know if you have the Shop Manual and in particular the CB550F addendum. They're here in a good resolution: https://www.dropbox.com/s/88zdzlj8olqi8pl/Honda%20CB500_CB550%20%20Four%20Service%20Manual.pdf?dl=0
As for the various CB550 Parts Lists, they're all here: http://www.honda4fun.com/materiale-documentazione-tecnica/parts-list/parts-list-cb550
Just compare the engine- and framenumbers of yours with those listed in the first 4 pages to determine what goes for your model.
deltarider:
Talking cutaways, what does this 2.5 refer to?
fogrider:
The cutaway is the curve cut into the bottom of the slide. 2.5 means the cutaway is 2.5mm deep at its' deepest. The less cutaway, the richer will be the mixture at off-idle openings.
I went from 2.5 to 2.2 as an experiment only to find negligible difference. Goes instantly weak off idle. I'm more used to Amals and SU's and they never do that, however bad they're set up. All very odd.
I expect I'm missing something totally obvious, but what ?
Carbs off again today while the sun's hot on the rubbers.
fogrider:
Deltarider, thanks for the 2 references above. It confirms the slides are 2.5. One thing I noticed is a reference to a slow jet. There is'nt one on the parts diagram so presume it's a drilling. Must check that for size.
Carbs are now off (again ).
Have to be really thorough this time, especially the needles.
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