Chain Saw problems and resolutions

I am afraid that I am not very good at keeping internal combustion (IC) engine devices up and running and this last week was no exception.  I have a Craftsman chain saw that I was given the help me maintain the property, and I have used it off and on over the last couple of years. I would guess that the saw is maybe ten years old. I kept the gas oiled and oil in the bar/chain reservoir so I was maintaining it more or less as suggested.  Last week, the chain saw got to the point where would not run for more than a few seconds.  Well normally If something breaks, I would take it apart and try to fix it.  But I don't do IC engines, so I took to to my father who is very very good with IC engines.  It turned out that the gas line in the tank had rotted and was no longer sticking into the tank.  So we replaced the gas line that made it run a little better but it still was not right.  So we took the carburetor apart and found wood shavings in the input side of the carburetor, evidently the fuel filter broke free before the rest of the gas line did.  Put it back together again and it still was not right so we noticed air going to the carburetor so that turned out to be the fuel primer bulb so we bypassed that and it ran.   In the week that it took to work through all of that my nephew gave me two Craftsman chainsaws that he had used that stopped working.  Have I said that my dad is amazing with IC engines?  He looked at both of the saws and decided that one that had such high compression that you could not pull the cord might be fixable, so he filled it with carburetor cleaner because he figured out that the cylinder was filled with carbon buildup. After that set for about half an hour we were able to start the saw put some carburetor cleaner in the gas and that saw is now working fine.  My father thinks that the saw was being used with a bad fuel mix.  Either the gas was bad or the oil could have been the wrong type.  So I now have two chainsaws that I will be using to clear brush and cut up downed trees for fire wood.  Next week I will let you know about my trials in getting my wood stove vented through the fireplace.