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Could be 'Vapour lock' when it dies, try opening the fuel tank and see if it starts back up.! If it starts and runs fine then I would put the cause down to a faulty tank vent, which isn't allowing air back into the tank to compensate for the fuel being drawn out meaning the saw is struggling to draw fuel out the tank as its in a vacuum.
Make and model might help but here's two ideas:
1) Remove muffler and clean it. They can get plugged up with carbon and the saw will run at low RPM but will quit because of excess back pressure when you try to rev it up.
2) Set the high and low speed carb settings. Start the saw then gradually increase engine speed until full throttle. Screw the hi-speed needle in slowly. If RPM immediately drops, back it out until Rpm increases, then starts to drop. Screw back in until peak rpm reached, then starts to drop. Back out to peak, then 1/3 turn more.
Set low speed so engine runs smoothly but chain does not turn.
Hope this helps.
Being springtime, I'm thinking you may have had your saw sitting all winter with last years gas in it. If so, you'll need to clean the carburator and spark plug real good, then put fresh gas in it. Always remember to run your saw out of gas before putting it away. Gas only stays fresh for a few weeks and will foul up your sparkplug as well as plug up the inside of your carb when it gets stale.
Why are you not standing on the help desk where you purchased this? If it starts to sputter then dies It is probably a plugged fuel tank vent. When it begins to act up roll the saw so the fuel cap is up right and loosen it a little. If it smooths out and runs correctly you just vented the tank and that is where the problem lies. If it suddenly stops running with no warning it is most likely an electrical problem. If you repair either of these problems it may void your warranty. Why not make Homelite repair or replace it? If offered a refund I would not purchase any product by the same manufacturer. At best their quality control is lacking. HTH
Your carb may be the issue but your ignition coil could be the culprit. Once they start going bad, they can act up intermittently or give various symptoms from day to day. The fact that your saw dies at full load or under load, probably means that when your saw gets hot or requires more spark, your coil is not able to provide it. Your carb is easy enough to clean out, you can take it all apart and clean all screens, etc....
I just replaced my coil due to the exact same symptoms and now my saw runs great. $60 off ebay and you can put it on in 15 minutes yourself. Check your carb first though