This shows considerable scratches and scuffing of the magneto piston on the intake side.  There was almost no carbon buildup.  You can tell I had been running 100LL AVGAS from the tan-white residue on the rings and piston top.   This confirms my choice in Pennzoil 2-cycle for air-cooled oil and Amoco 93 fuel.   The engine had more than 260 hours with no de-carbon when the crankshaft rod bearing let go.