Years back I had on of those Poulan Pro 42cc with the Durachrome bores, and that thing was a tough little guy.
We were cutting a large Willow tree down at my dads place with it. I was at the time a on-call crash investigator and got called to an accident. Before I left, I told my dad and sister's idiot boyfriend that the oil had not been put in the gas yet and needed to be mixed. I took off and did what I need to do, and returned about 2hrs later. My dad and sisters boyfriend were sitting on in chairs and almost all the tree was cut up. I then asked why they had not finished? Sisters boyfriend said that the saw would not idle, felt like it was low on power and was so hot when running he could not hold onto it any longer "this saw was only a couple days old". I looked over to the fuel can sitting by a stump. Right next to the can was the oil I had told them to mix in it. I then asked if the put the oil in the gas, which they said NO! I asked how many tanks they ran through it and was told 4-5tanks
I grabbed the saw and pulled on the rope, she fired right up but would not idle. I then pulled the muffler off and looked at the piston and rings, and they looked like someone put them in a cheese grader.
I looked at my sisters boyfriend and said well I guess its broke, and you can have it. He asked where I bought it at and if I still had the receipt. I gave him the receipt to the big-box store I bought it from and he came back an hour latter with a new saw "WTF". I asked them how in the world he got them to take it back? He said I just told them it would not Idle properly and they gave me a new one!
We still have that saw at my dads house, but we do not have the boyfriend around anymore!!