SOHC.co.uk Forums > CB500/550

idle jet differences , 069's

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Bryanj:
Pods are always a problem and the "simple" foam filter may just be altering the airflow enough to upset the running

fogrider:
You're right, I'm just checking and eliminating what I suspect and ensuring all is correct. There had been a lot of poor work on it, neglect, bodgery even ,so I don't know what's been done until I dig into it. Lots of little things together can add up. Making the slides slightly richer is a last resort, as you say, it should'nt need it but if that's what it takes......I'll try it even if it's just an experiment. Last resort.
When I finally cure it, it will be the most comprehensively  serviced CB550 on the road !

Had a look another look at the 56mm/ 49mm thing while the tank was off (again). I had set mine at 56 whilst the carbs were off , it's not critical, simply puts the cable crank in the right field, hence the 3mm allowance. The German guy simply measures it from  more obvious points. The measurement is point to point too, I notice someone on here was measuring  it 38 mm, but was being mislead by the lines added to the photo. It was probably right point to point !

K2-K6:
Presumably T150 is a Trident? Can see your point there regarding mixture. These 550 are probably exactly the opposit and bang on the money for AFR with any error likely to be toward lean if any compromise is present.  Generally extremely accurate for fuelling and run well through their rev range.

Agree with Bryan's view regarding foam filter, they are certainly sensitive to any shift within intake system and many struggle when using pods.

Interestingly,  pods in my view seem to need different cut slides,  which ties with your perception now. Probably a good move to asses with original type air filter to see what you get.

ST1100:

--- Quote from: Bryanj on May 31, 2021, 12:55:10 AM ---Pods are always a problem and the "simple" foam filter may just be altering the airflow enough to upset the running
--- End quote ---
Couldn't agree more... (had a recent episode with a CB600F PC36 which was garaged for 3 years and wouldn't fire "...just needs carbs cleaned..."; yeah... all cleaned and bench synced it fired up nicely, but bogged on throttle... sports-filter out, OEM paper element in, and what you know, reving promptly and smooth...)

OEM setup seems the best, as it's just working under all given conditions...

fogrider:
Air filter element and 4 spark plugs being ordered tomorrow. The plugs look OK, but who knows how old they are, won't hurt to have a spare set if they make no difference.
Made some experimental changes to the ignition set-up , had a ride around , definitely improved and even my non technic wife said, on return, "that sounded way better".

Hopefully, an air filter may just make the final difference. Should have spotted it was'nt a pleated paper one sooner.

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