Yeah, it seems like a dirty fuel system is usually what is wrong with the power equipment I come by. I've repaired several little snowblowers, a snowmobile, rototiller, go-kart, a chain saw, an old honda generator, push mowers, and weed whackers. All were either free or real cheap I seem to have the same luck with electronics and appliances too .
Best tank= 81.23 mpg on july 1st 2008
SAVE SOME GAS, SAVE THE WORLD!
Our old lawnmower kept running worse and worse, then my father (very unmechanically inclined) thought it just needed to be cleaned, so he attempted to clean it. But after he did it no longer ran, so the parents got a new one, I was shocked to see the thing sitting by the curb so i stole the enigne from it, and found that my father had managed to cut the ignition wire when he was cleaning it. :-) great little motor for my lanwbike. I actually got the bicycle frame from a garbage pile too haha.
I also take apart everthing before i throw it away, never know when you might need a 543k ohm reisistor. Or 5k pot.