The piston crown started to melt directly underneath the spark plug .The spark plug was unable to transfer it's own thermal load to the cylinder .Because the cylinder was unable to be cooled efficiently .
Cylinder fins packed with solidified oil ,sawdust and wood chips.
This caused extreme heat build up and lead to detonation and
lubrication breakdown .
Either that ,or the engine was over-revved and not for just a short while .
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