Try our new info resource - "Aladdin's Cave" (Main menu)Just added a separate link to Ash's Dropbox thread (shortcut)
http://www.sohc.co.uk/index.php/topic,8209.30.htmlSee reply #41
I encountered a similar problem on a friend's CB550 back in 1988. In the end we binned the electronic ignition and went back to points.Recently, I was on the verge of converting mine to Boyer, but I think this thread has put me off the idea
Quote from: florence on August 13, 2019, 09:27:12 AMI encountered a similar problem on a friend's CB550 back in 1988. In the end we binned the electronic ignition and went back to points.Recently, I was on the verge of converting mine to Boyer, but I think this thread has put me off the idea I’m running Boyer with their micro coils, first class operation. Nice bit of kit. Would highly recommend it.
have you checked the valves i.e. compression test and valve clearance.. sorry if you already have, I didn't read back through the whole thread. I had a misfire on a 550 many years ago which I initially thought to be ignition or carburation related... but after much frustration I ended up having the valves re-lapped which solved the misfire and totally transformed the motor..
Try synching the carb's with Bryan method of mechanical setup and run it like that. Don't put the guages on it at all. Then setup the idle air screws as per Honda manual routine. It's very specific as to how it should be carried out for initial setup after carb rebuild.