SOHC.co.uk Forums > CB500/550

The dreaded tickover

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royhall:

--- Quote from: UK Pete on June 02, 2015, 07:06:59 AM ---Does it have those stupid PD carbs the late 750,s have?, if so your flogging a dead horse they are shite
peter

--- End quote ---
Plus 1 on the above. Couldn't have put it better myself.

matthewmosse:
If you can get the carbs working right, the bikes are amasing on fuel use. I once did Fort William across A9? I think, anyways over to the east coast of Scotland, then down to Edingbourough, on to Glasgow and a bit more on one tank of fuel, before comming the rest of the way home on the next tankfull, and as I seem to recall it bumbled around for nearly a week of commuting before requiring a futher fill up. Odd as it started the trip matching my mates 250N to the penny on consumption but was using a good gallon a tankfull less by the end of the trip- I was carrying a 1 gallon can in my top box, which the other bike ended up using. I think the k3 carbs were always fine unless the bike was not used reguarly, at which point they are indeed inclined to give issues.

florence:
I think they all have a tendency to be a bit lumpy at low revs; I just turn the tickover screw until it's smooth and ignore the rev counter. (actually mine's been disconnected for several years since the cable broke)  On a long run when my bike gets fully warm I sometimes find myself doing a quick adjustments at traffic lights as I arrive at a town or something.  The primary chain and clutch are not the best design really and seem unhappy with low revs.

Ashdowner:
Yes I've got the PD carbs. Yes mine stalls every now and again for no apparent reason. It also suddenly races for no apparent reason. Guess I'll just have to keep the tickover at 1400 and live with it.  Thanks for all the comments.

deltarider:
Before you do anything, verify your tachometer is telling the truth. I remember I was once working on a CB550K3 trying to get a nice idle. In despair I reached for my automotive DMM to soon find out that a true 1000 rpm (DMM) showed 1400 on the Honda (I believe it was ND) tachometer.
I do not recommend idles below 1000 rpm. You want that oil up there.

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