The muffler isn't attached
They do more than just keep the noise down, imo it will kill your top end in short order.I use a Husqvarna. Would lack of a muffler cause this much trouble.
Does it idle differently on its side? If so it could be crank seals or your cylinder head bolts loose, sucking air.It will run for 5 minutes and then starts bogging down. Take it off the log it speeds up again. Leave it on the log and it will die. The vent hose was new but I took it off anyway. Same result. The compression is ok.
It has never had anything electrical done to it.
It will restart but not easily.
When I say idle differently, usually they will fast idle on one side and die on the other. If that’s the case you may want to pressure test the cylinder/case, or have the stihl dealer do it for you, if you can’t find anything obvious.Does it idle differently on its side? If so it could be crank seals or your cylinder head bolts loose, sucking air.
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