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Air testing "through a carburetor" is a new one on me. Throttle shafts leak even when new.

That's the tech "overtighten preventer"

You probably have rubber stiffness/shrinkage. Either replace the boot, or remove a little in the noted area in my screenshot.

Stihl still makes them, I believe. If people keep buying them, they'll keep making them. .....or try one our sponsors on here....

Check cylinder screws for tightness. Impulse hose maybe not hooked up. Rare, but possible: impulse hose misaligned or folded under at the carb connection. Also; small bubble pools of water in the fuel tank are not uncommon in chainsaws. On the bottom, right where the fuel pickup is. Gravity

Make sure it's not some homemade throttle rod. I've seen it before.

Plug wire shield maybe

I guess 051 or 045S or 038S I can measure an 051, but tommorrow. Can you measure the pin dia, the total height, and the pin center to top? Looks long, like an 051

Yes, +1 here on the injector. They do wear over time. Just like throttle shafts on a carburetor do.

That's not broken to me. Lol Why not put an aluminum skid plate over it? This is broken.....

Check your flywheel keyway, or it's a malfunctioning coil.

Don't forget to remove the clips stuffed in the backside of the piston......

Just finished this old saw. It was disassembled for five years in a tote. Stumbled across some NOS parts, cheap on eBay, and it was just the parts I needed.

That ball is for the choke detent, isn't it?

Echo's work the best IMO. Reliable.

Try tilting the saw on it's side when you prime it, or try pumping it when it's running at partial throttle.

Tilt dieing sounds like something opening up from AV mounts, or throttle linkage rubbing, bent, or possibly a flexing handle pushing the throttle rod hard against the idle stop. Check your throttle & choke shafts for looseness too. Could be heat boiling your gas inside of the carb. Try a...

Looks normal to me. Browning is usually caused by short cuts which leave the cylinder wet with fuel.

Crank seal bad, intake boot leak, check end gap on rings. Once I got a 46mm piston, with 45mm rings. I have seen rare flywheel magnet issues causing no start.

Like this? Lol