Well, I pulled the carbs off and went through them, and they were very clean. Had to pull the pilot jets out and unplug them but overall extremely nice. checked the gearbox oil and it looked very clean/fresh. Pulled the plugs and though they were a bit sooty they looked ok. Had to clean the anti-slosh foam out of the tank as it was disintegrating. Put 1 gallon of 30:1 premix in it and tied bump starting it a number of times but no joy. any guesses?