im looking at buying an used 039 from an older guy i know. low hours. seems to run fine. disappointed on power though. dont think it mechanical just underpowered. looking through exhaust and intake port the piston is free from scratches. though there is dark band of build up just under the ring. like dark lacquer. there seems to be more then normal ash and carbon build up in the exhaust port. the guy always used 10% ethenal gas 89 octane with stihl oil. i have the saw for a week to decide. what should i look for in the saw. lets here some opinions on stihl oil. any good. should you run a little sea foam in the gas. maybe do a before and after picture. how much it cleaned up. for sure its going to need exhaust mod. any good instruction and pictures on that
thanks
thanks