A buddy had a bodge engine that was "seized" and never ran, so thought I'd take it apart and share some finds...
The flywheel would not budge, impact, heat. Thought maybe the crank/piston was seized, confirmed the piston had expanded and seized in jug. The piston was not a piaggio piston and had some weird markings on it, but through the process of unsticking it, the markings came off. Found they had rigged up a head gasket and still had some Vietnamese script.
The back side was revealing, under the clutch cover, it appears some genius felt that JB welding the clutch side seal .
So the crank wasn't going anywhere and I was starting to suspect the flywheel may be similarly bonded.
Never have I seen rust inside a solid piece of metal like that.
Gave up on splitting the cases the proper way and just had to get a look inside, no oil, dry as a bone, cush drive plate came off with slight pressure from a flathead, all the gears had signficant wear and hairline cracks, and there was more rust.