SOHC.co.uk Forums > CB500/550

The dreaded tickover

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Ashdowner:
I'm sure this has been flogged to death but can I please have the definitive answer on whether it's actually possible to get a smooth tickover under 1400 rpm on a 1977 CB550K3 and what is the true source of the cacophony of noise from the crankcase at anything lower than 1400. My "new" bike has exactly the same as my old one and I've done everything I can to balance my carbs (gauges, airsscrews, prayer) and it's still lumpy below 1400. Also how much choke do I need to use to start it from cold because if I open it full it refuses to fire? I'd add that on the main jets over 2000rpm it flies like a bird. In passing I read an MCM article some 30 years ago that said words to the effect that 550K owners simply have to accept that on tickover it sounds like someone has thrown nuts and bolts into the gearbox.

Ashdowner:
Yes Oddjob but the 400s & 500s never had the problem that the 550s have. Different animals

matthewmosse:
My 550 could run ok / run quiet at 1k rpm, but only when it felt like it. - true of both my 550k3's, and both had a habbit of randomly stalling if in neutral waiting at lights. I am of the oppinion that the carbs might have been why mine were shall we say tempremental. Probably primary chain and cluch baskett contribute to the noise, at least 1 of my cb550k3s had a new camchain, but both would have run their original primary chains and cluches.

peterengland:
My 550 ticks over fine at 1500 rpm, there's nothing wrong with this, don't try to get it too low, there is no point at all despite what some will say. The 550's and some 70's Hondas were prone to 'low end clack'

UK Pete:
Does it have those stupid PD carbs the late 750,s have?, if so your flogging a dead horse they are shite
peter

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