Honda-SOHC

but i have never had problems.

Neither did I. 130.000kms+

That refers to the 500. On p. 141-2 you'll find service data for the 550.

550?
Thickness plates (new) per Honda Shop Manual is 2,6 mm. What makes you think you have to renew them?

Actually 15W40 is the better oil, unless you live in the north of Canada and ride at temperatures below zero a lot. Mine shifts better with 15w40.

Same.

Indeed, according to the picture in Honda's Parts List CB550F2 (1978-07-20) the F2 had Super Sport on it's tank. Other details tell yours is a F2 indeed.

Couldn't agree more. I share a set of 4 clocks with another friend/motorists. Unless you have more bikes, cost of buying is hardly justified. That's why we shared and soon an owner of 2 350's will use them too. My experience is: once set you don't have to sync for a long time, very long indeed. As a matter of fact when you think they're out of sync, I would advise you to look for another cause. In my experience the carbs stay synced almost forever. Honda did a good job on this, after learning lessons with the 4-cable operated carbs on the early 750 models. Last time I used the set is some 15 years ago. On a few occasions I had the carbs on the kitchen tabel (for experiments with the needles) and decided to see how accurate I could sync by hand, using a small allen key for testsliding under the little cutaway section in the front side of the slides. I adjusted, testslided, adjusted, testslided etc. Then I drank a cup of coffee and checked it again, eyes closed for maximum touch. After mounting the carbs on the bike and attaching the set I was surprised I had managed to sync within 2 cm Hg(!), well within factory specs.
Maybe - just for fun - I will build a DIY as described elsewhere, because I like the idea so much (simple fysics). Gives me also the possibility to check if the 4 clocks are still within calibration after all the hefty movements. The homemade set can never lie. No negatives: you need no figures, just visual information that fluid is at the same level. For the rest of you: share. Less is more.

On my 500 I always managed two chains per one set of sprockets. No problem.