Oops! the ob is a Johnson 2-stroke, year 2000- but lightly used. Am guessing that when it overheated, that's when those deepish scores happened in the cyl. and the head
warped a bit. (still okay with their recommended .003 tolerance & can be faced)
Totally disassembled the powerhead & cleaned the parts. Bearings were okay, but, huh, the upper and lower crankcase seals
were bad and leaking. Ah-hah!- all that oil
coming from under the flywheel was due to a leaking top seal...interesting...and all that time I thought that oily condition was "normal".
measured cyl's w/ bore gauge & good news, the block is reusable so can be taken to machine shop for larger bore to fit those larger, .010 or, depending on depth
of score marks, .020" oversize aftermarket pistons.
The hard part will be putting all the parts back together and not having some screw, bolt or o-ring left over, that'd be my dumb luck