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New piston and barrel required

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Your spark plug being to hot or cold won't do this. 

Instead - its either:

  • old fuel with no octane rating left
  • an air leak in the crankcase (sometimes around base gasket - were the head bolts loose?)
  • a carb issue, e.g. blocked jet, not enough fuel getting through, running lean.
  • blocked tank vent, air leak in fuel line etc (again lean issue)
  • too advanced ignition timing - did the rotor slip on the crankshaft?
  • compression too high - no base gasket etc. Can see one in your picture though.

one of the above has caused detonation and overheating.

Edited by notch
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