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Re: Husqvarna chain saw starts and runs for 20 minutes...
Two things could be happening.......first is vapor lock......make sure you breather tube is clear and working........next is ....it could have a bad ignition coil on it.....after the coil gets hot the spark can become irratic or just not work any more.....
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If the cahin is new, then it will stretch for a while. Make sure you have enough oil going onto the chain when cutting, and not to much pressureon the blade when cutting, let the saw do the work. Also, if your chain is dull or blunt, it will get very hot and need frequent adjusting. Hope this helps you out a bit.
Check to see if your tank vent is plugged.Fill tank full of fuel and run saw till you start to hear saw having problems,when this happens loosen fuel cap and see if it helps.Loosening the fuel cap will let air back into the tank if your vent is plugged.
Take it to a local saw shop $10± for 20". It will save you time and headaches. Consider purchase of a spare chain or 2 (about 5 minutes to fabricate with yours as a sample). Ask about a more aggressive chain if you wear PPE while cutting. HTH