Yeah, that shiny piston head is a clue!
Any cylinder head repair facility can check for cracks, but you can do
the air hose test yoursefl -- use a parts blower nozzle on an air hose
and blow laterally across the top of the combustion chambers. Cracks
usually cause a shriek, and in some cases are clearly visible. The
bad ones are between the valves and between the valves and the pre-
chamber. Not repairable so far as I know.
Peter
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