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It was running the carb out of fuel under a load. That's a lean burn on a piston if I've ever seen one.
it wasn't detonation.det causes breakage not melting.
Nt that I'm aware of. PREIGNITION that many mistake for detonation will tho.
I took a piston exactly like that to the guy that runs the crank shop a while back and he said straight off "looks like detonation to me". He then asked about compression ratio, jetting etc.Looks to me like it may be bad fuel if the other things that usually cause lean condition etc can be ruled out.