SOHC.co.uk Forums > CB500/550
Stalling after flooding the engine with Petrol - 550K 1978
Phteix:
So last day after changing my handle bar I managed flooding the engine with Petrol ::) very amateur, I know.
But after that the bike would start and after starting would run very "heavy" as expected, I noticed the smell of petrol in the oil, so decided to replace the oil for a new oil, Valvoline 15w-40 and new spark plugs.The bike is starting okay, but after running a few miles, it starts losing power and stalling.
I don't think it is the carburetor, I have managed to keep it clean and synchronised. The bike was running perfect before.
Any idea what's going on?
Is this a good oil to use on my 1978?
Thank you in advance
Johnwebley:
This may be a daft question.
Were do you live?.
If you live in the UK.at present it's cold with a high moisture content.
You may be getting carb icing.
I think it will be more frequent with the E5 biofuel
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Phteix:
Not at all!
It's around 7 degrees Celsius at the moment. Is that possible? 😕
Johnwebley:
--- Quote from: Phteix on November 26, 2020, 09:51:21 PM ---Not at all!
It's around 7 degrees at the moment. Is that possible?
--- End quote ---
It happened to me last week. Went for a brisk ride. Coming back. And stuck in traffic. Just ticking over and the bike stopped. Wouldn't start immediately. But was rolling down a slope. After about 30 seconds it started. No probs.
I THINK the slow running caused ice to form in the venturi.
When it stops. The engine heat can warm the carb and melt the ice.
In aviation. Small Cesnas and Pipers have carb heat levers to stop this happening.
Cars tend to use hot water ducted through the inlet manifold to curb it.
Just an idea.
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taysidedragon:
Could be carb icing as suggested. In the right ( or wrong!) conditions it can happen even on quite warm days. Some later bikes have electric heaters on the carbs to prevent it.
The recommended oil is 10w-40 but you're not far off, shouldn't make much difference.
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