Hi,
Do a leakdown test. It'll tell you if the ring is bad on #2.
The values for cyls 3, 4 and 5 look iffy to me. A leakdown test will prove
if the valves are sealing and/or the head gasket is bad.
Back to #2 - make sure the wire is okay and that the plug isn't messed up,
e.g. move the plug to another hole to see if the fouling follows the plug.
An intermittant hi-tension problem can lead to fouling just as easily as
too much oil in the combustion chamber (from valve guides or rings).
Check the simple stuff first.
rml
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