RE: Broken engine?
You may find that the sleve is bent also. Some of the damage is not that obvious up front. I tore up an O.S 52 four stroke, really badly. I was looking at what I could salvage and then sat it aside. I took another peek a couple days back and found a lot more damage than I first thought, IE the valves were even bent. I thought the piston was OK, but on close inspection, the ring was pinched in the grove. I didn't bother to pull the liner out, but based on the rest of the damage, I wouldn't bet on it being any good either. Stuff like the liner and piston are not obvious when damaged some times. It it is slightly squashed, IE not exactly round any longer, it is trash. When you finish buying parts and if you value your time at all, it will end up being cheaper to just suck it up and buy a new engine.
Don
PS, I did save in internal workings of the carb. Had to buy a new body though.
Don