Iseem to have caught this conversion bug and couldn't resist picking up this Stihl 066M for next to nothing. The seller said it had no spark - probably needed a coil, but had good compression. Well, it did have compression, but not great. He knew nothing about the saw or its history.

The rings are stuck and virtually welded to the piston on the exhaust port side. There is some scoring of the cylinder around the exhaust port. I didn't check the cylinder for roundness. The wear inside the cylinder is actually quite smooth except for a couple of small areas were there is some gouging (probably a couple of thousandths deep)

Anyway, is there any way to salvage this project without buying a new piston and/or block?

The last picture is a closeup of my plane tonight as Iwas packing up. It and Iwere covered with those friggin' No-see-ums (<span style="font-weight: bold;">Ceratopogonidae)</span>. Real fun having them bite the inside of your ears and nostrils while you practice your sequence flying. There were so many of them Ithought I was in Stephen King movie or something.

Thanks All