Posted by ThadS on July 08, 2013 at 07:53:47 from (204.77.163.4):
In Reply to: 860 ignition posted by ThadS on July 02, 2013 at 06:11:28:
You are correct. Incomplete combustion is a bad description of it.
I took souNdguy's suggestion and swapped the plugs in cylinders 4 and 2. Ran the engine for a bit and checked the plugs. The new plug in cylinder 4 was not fouled. The fouled plug placed in cylinder 2 had a little bit of the ceramic cleaned up.
I checked the spark with that plug and was getting a white spark of about a 1/2". Cleaned the plug and put it back in cylinder 4. Mowed once around the yard and checked it again. Still clean.
I guess that plug did not have a good spark initially. Everything seems to be good now.
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