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Maybe 120-150 pounds? 150# should be close to new. Vacuum and pressure tests check the seals in the case. I don't know much about it, but the general idea is to add vacuum and/or pressure, and see if it holds. I think it's just a couple pounds for a fixed time period. Say you add 2#, it should...

What I hear about carbs is it's better to just buy a new one due to price, and the difficulty of getting carbs fully clean. Wouldn't hurt to to clean them up, and check the rubber. Maybe you'll get lucky?

Might just need rings.

You buy a cylinder and piston as a set. Turning it with the sparkplug out will be fairly easy. With the plug in, it should be kinda hard.

I'm not a gearhead, but the first thing I'd do is pull the mufflers and take a look at the pistons/cylinders. If everything's trashed, I'd likely use Chinesium parts if I just wanted the learning experience working on saws. If they looked good, I'd tear everything down clean it up good, and see...