SOHC.co.uk Forums > CB500/550
CB550F2 '77 slow to rev when starting
deltarider:
Once I managed a low idle of 800 rpm after a perfect sync I guess. Long time ago a CB Four mechanic warned me not to strive for that. Camshafts wear most at idle. I forgot to ask why this is. I'd rather stay on the safe side. Mine idles fine at 1200 rpm and there's nothing against it. Within a minute after a cold start chokes are fully open again. BTW, these bikes with the oldstyle carbs are not supposed to ride with the chokes still partially closed. Just have a somewhat raised idle for the first mile or so, which is also what the book recommends.
alexdecker:
Thanks all for replies. Will go through usual maintenance next week, ending with sync. See if that helps things.
Does any of you have a video of a well set up bike and motor, so I can hear the sound of the idling for reference?
Oddjob:
Doesn't really work Alex, the video makes the bike sound like a bag of nails usually.
alexdecker:
Yeah I figured. Just like to hear engine sounds from the CB bikes 😂
McCabe-Thiele (Ted):
This is my 400 before strip down - bag of nails!
https://www.youtube.com/watch?v=3CpAYjNHggI
Someones 500 https://www.youtube.com/shorts/a4CVm8PAAXE
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