One note about the newer "el cheapo" Poulans. I found that two of my newest cr*p Poulans started running lean. Maybe caused by the lesser BTUs in newer gas is ethanol?
If I could of just reached in with a screwdriver and opened up the main jet - all would of been fine. But I couldn't. They've got special splined ends on the jet-screws and the price for a wrench to fit is ridiculous. I finally made a tool with a red crimp-type electrical butt connector. It grips the ends of those screws and turned them. The saws run fine now. If I had left them that way (lean) they would of burnt out.
I also run a 25 to 1 mix which makes them run even leaner. So the extra oil plus the ethanol requires opening up the main jets a bit.