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July 24, 2020 at 9:29 pm
#209752
Can you confirm the lower plug was inspected immediately after running the moter? As in, before any water in the combustion chamber had evaporated ?
Are the capscrews on the head all torqued down to spec ?
Is the compression in the lower cylinder more or less the same as the upper ? Sometimes when you have good fuel/air supply and spark, problems with one cylinder could be stuck or broken rings or mangled reeds (the latter is probably not the case as you wouldn’t get the carboning up of the plug.