SOHC.co.uk Forums > CB500/550
CB550 Tuning Advice
K2-K6:
Aah! The choke on any carburettor is described as ON when its restricting airflow by shutting off the incoming air. That's it's starting/cold position.
Choke OFF is with the restriction of incoming air least affected. This is normal/warmed up running position.
Neilw:
--- Quote from: deltarider on October 21, 2026, 03:59:50 PM ---Just to make sure: when the little chokelever is horizontal the chokeflaps are down (to facilitate cold start), when the lever is vertical the chokeflaps are up (engine warmed up).
--- End quote ---
One simple question (Thank you), and now i get this :-)
https://youtube.com/shorts/rqzMJKfwX5I?feature=share
A bit of white smoke.
Haven't tried with choke on :-)
Got it idling with throttle screw adjustment.
That's me done for the day, now feeling very happy i've heard it running.
Thank you so much for bearing with me.
Bryanj:
On is when butterflies close off the hole, off is when theyare horizontal i.e. hole open
K2-K6:
That sounds really good in the yt clip Neilw.
Bang on the money for carb balance, so much so that I wouldn't change that at all.
From an interest point of view to us out here, a clip of it with gauges hooked up to show what they read would be interesting. But I'd not change the balance set you've got .... even if the gauge suggest any variance.
Well done with tbe detailed work, very frustrating at times, isnt it? That's very good progress there that you've got too.
"White smoke " is just vapour from combustion before the cylinders and exhaust have got fully warmed through. That'll disappear when fully up to temperature, perfectly normal from cold start in engines.
deltarider:
Now bring the rpm down to say 1150 and then let us judge the sync.
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