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spark plugs

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petrolderek:
This is interesting. These plugs were NGK and have been "wetted" a few times, I had a contact breaker fault then found that at some time it had been fitted with some under size rings so the engine has been flooded a few times. I have never herd of this wetting issue before. So just drying them out doesn't  work. I am going to have to take the carbs off again and fit some new float valves to stop it flooding or I am going to be knee deep in spark plugs.

murdo:
This may be of some interest to you.
http://www.ngk-sparkplugs.jp/english/techinfo/troubleshooting/03/index.html

iansoady:
Interesting article.

petrolderek:
I have just read the article I think it should say more leakage occurs not less leakage.

And when the green spark plug company said you fitted the plug in a cold engine they must have been referring to the mixture being too rich and not the actual temperature of the engine because it make no sense otherwise.

Its occurred to me that the plugs have never failed while the engine was running its always when the engine has been left for a few days and the engine is cold and it doesn't start, could it be putting the choke on wets the plug. The Yamaha was running fine when I stopped it but two days later it wouldn't start due to the plug. I don't remember having these problems back in the day.

Rex:

--- Quote from: petrolderek on June 25, 2018, 12:30:01 PM ---I have just read the article I think it should say more leakage occurs not less leakage.

And when the green spark plug company said you fitted the plug in a cold engine they must have been referring to the mixture being too rich and not the actual temperature of the engine because it make no sense otherwise.
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No, he said I should have started and warmed the engine on the old plugs then replaced then with the new ones while the engine was still hot. He even posted a link to some article supposedly supporting this method, while I just threw the plugs in the bin and vowed never to use the t*sser ever again.
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