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The springs could be stretched from overheating or broken from age. I'd look there next. I guess it's possible for a worn throttle plate to not shut all the way. But after checking the springs and replacing the clutch, it will likely be an air leak next. Clutches are cheap if you go aftermarket.

Sprocket will spin without a chain on it. Make sure the clutch bearing is in good condition and greased. Also make sure string hasn't wound up between the sprocket and washer, that can cause a bind and spin the chain at idle. I found that on a 046. The bind was so much that I had a hard time...

Make sure the idle speed screw ( not the Low mix needle) is adjusted properly.

They supposedly add lubricants to starting fluid, but a few drops of oil in the carb actually goes a long way. All he needs is 10 seconds of running, just enough to get it up to speed long enough to know the ignition is stable.

It is possible for spark to be intermittent, just saying. Things like the spark wire, the spring on the end could be broken or dirty, plug could have a loose threaded type connector, timing circuit in the coil could be bad. You could try to see how much you can run it on spray. Maybe put a few...

Where did I say they have NO torque? I said they have LITTLE torque, and my context was obviously about how they come from the factory. Besides, WE can't see how big of wood you just cut there, and that looks like only a 25" bar, 28" at best. And I measured proportions in the video against mine...

I think stock needle settings are 3/4H and 1/4L. It might need a new ignition. Make sure the flywheel key on the shaft isn't broken. The ignition can be set with a business card between it and the magnet. Maybe junk recently moved into the carb?