RE: Four stroking 2 strokes
MJD and Sport Pilot,
Yep, the rod failure was with engines that couldn't even be rotated at room temperature. When I gave the liner a head start with the flame pre heat she would turn over. But as the temps stabilized (both the piston and cylinder) during the run the P&L fit reverted close to that of the room temp fit and over loaded the rod. This would have happened no matter how I would have broken in the engine as I had fitted the P&L way too tight.
Back to the P&L fit as a result of running rich. I have seen little (actual measurements) to support accelerated wear in rear chrome plated ABC engines.