CB550 Tuning Advice

[Neilw]

Rather than continue this topic in my Highs and Lows thread, I thought it would make more sense to start a new topic specfic one.

Now I have the carbs in 069A, and the bike is starting and just about idling. I'd like to start tuning the old girl.

For reference so far, I've set the valve clearances and points, both static and dynamic. I've bench-synced the carbs per Bryan's instructions and set the float heights with lots of testing. The air screws are one and a half turns out. Circlip on the needle is in position 2.
All rubbers are new; stock air box, new filter.

I've got a vacuum tester.

I've checked with ChatGPT, and it gave me a list of things to do, but I'm wary of diving in without checking what's worked for you.

Where do I start, and in what order should I proceed? I should mention that the top end had a re-bore, and I have new pistons & rings, +.25

I've looked in the common service manual, and no single topic covers it, so even a summary would help me dig deeper.

Many thanks, guys.

[K2-K6]

First, and fundamental, is to individually turn each airscrew in isolation with it running once warm and with choke fully off.

If there's not reasonable/perceptible shift in running, for that cylinder, then most/ further settings to optimise will be invalid.

This checks the normal, acceptable presence of the idle circuit function for air and fuel modulation, without which it'll never really run correctly. 

Any fault with this and you'll need to identify exactly what the cause is.