sprkplug:

I've melted many a piston in my time. Snowmobiles, 2 stroke, adding oil to gas. Temp changes, loads, etc. Not pretty at all. I think only once did I actually make a hole in the top of the piston, but I sure did crater a lot of them! I went so far as to install pryometers in each cylinder. Even then I still cratered one more piston. Each and every time I was able to hone out the cylinder, and only once (when I holed the piston) did I have to change rod and crank bearings.

I think the only way to tell for sure is to take the motor apart and see how bad it looks.

Omaha, can you take out the plug and show us what it looks like?

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).