SOHC.co.uk Forums > CB500/550
Judge my CB550F2 1977 idling
alexdecker:
Oh my god, Deltarider was right on the money! Rechecked everything and was slowly going insane. After reading his comment, I was like "surely that can't be it". Went down, one of the wires on the second point had slightly moved towards the plate and was making the tiniest of contact. Cleared it, started the bike, and it went ahead and puuuuuurred like a kitten (albeit a kitten who needed a vacuum sync), firing on all four again.
Shit, these old bikes. It can be anything, but sometimes it's just the tiniest stupidest of things.
We are back! I vacuum-synced it today. Will be back with an idle video tomorrow and ask for comparison with the old one. To my ears, it sounds beautiful now. Also it revs so cleanly.
- Alex
deltarider:
It is often missed, when it occurs intermittent.
alexdecker:
Okay, here is the original idle: https://youtube.com/shorts/xxPyy_B_-Uw?is=KRgiZOVffDpVbALb
And here is the idle now, after new boots and a full service, finished off with a vacuum sync. Best I could do: https://youtube.com/shorts/o2YUFxFuxzQ?is=LzYdFp6CxF26aIb0
Does this sound fine to you?
deltarider:
It's fine now. Go for a ride, in town, minor roads and highway. Have it run at a maintained 6000 rpm or higher for some time to burn of all the carbon caused by all this idling. You'll be surprised.
alexdecker:
--- Quote from: deltarider on August 17, 2026, 05:57:53 AM ---It's fine now. Go for a ride, in town, minor roads and highway. Have it run at a maintained 6000 rpm or higher for some time to burn of all the carbon caused by all this idling. You'll be surprised.
--- End quote ---
Ah, interesting! Theoretically, what can happen with the build up of carbon? I never really thought about that (like so many other things obviously)…
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