SOHC.co.uk Forums > CB500/550

Stalling after flooding the engine with Petrol - 550K 1978

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McCabe-Thiele (Ted):
Icing up was common on old cars with SU's

flatfour:
Carburettor icing, as suggested, will most often occur between 0 - 7c on damp days and when engine speeds (i.e. airflow through the venturi) are low. It does not readily occur when air temperature is below 0c and is infrequent above 7c, although can happen.

I seem to remember Kawasaki retrofitting some of their bikes with a small "Water Jacket" around the carburettors and intake manifold a few years ago as they were suffering quite severely from the problem.

Perhaps, given recent weather conditions it is the cause of the problem mentioned?

JezzaPeach:
Just a thought. Maybe try running a shorter distance (before it cuts out) then stop and idle for a few minutes and then carry on the same distance, and do the same again. That might keep it warm and show if it’s more likely to be icing. Or maybe fuel starvation.

Phteix:
True, could be that. I live by the sea, was very misty and cold when I tried. I found someone talking about Silkolene Pro FST on a Kawasaki forum. I just bought some online, I will try to run a few miles with that and see how it goes. Definitely not the best time of the year for a ride 😑

Thank you for all the help.

JezzaPeach:
I use Sta-Bil which seems to help keep the carbs clear.
Back in the ‘70s my 500/4 never iced up even in snow in the Alps, but if fuel has been left for a while and absorbed water as we are told, then maybe that increases the risk of icing.

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