Agreed. Just don't see where it could have leaked. Not many possibilities. No carb adjustments unless you have a special tool and all the rubber parts are pristine. Won't make a bit of difference in the rebuild, as I am replacing the crank seals anyway and have thoroughly inspected the fuel line and intake boot. Will dunk carb in jar of mix and put preasure to it to check for leak there. Not much else can be done. BTW, the engine never "seized", it just wouldn't fire.
The saw is like brand new so it is very unlikely any of the rubber parts / seals degraded / shrunk / cracked. With no carb adjustments possible, other than idle, what else could I check for leaks.
I'd think the 2 biggest reasons for lean sieze are carb set to lean and a partially clogged carb, make sure to clean it good. Also a pin hole in the fuel line. Steve