Tore down the motor. Not sure what to think.
Looks like some metal went through it. Top of piston and cylinder head had shrapnel. Side of piston looks scratched as well as liner, piston looks worse than the liner. Ring seems to be intact, though it was stuck. Can't find anything that came apart in the motor. Crankcase was clean and looked good. Bottom of cylinder head where the plug opening looks weird. Is that the way its supposed to look?
Was running HP ultra 50:1
high needle was between 1.5 and 1.75 turns
low needle was at 1.75 turns
Plug looks good.
Included some shots of my baffles. Been running all last summer and this year without heating problems so far.
What da ya think?