Pump out the old fuel because Stabil will not work for more than about 45 days. Put a can of Sea Foam in the new fuel. I would change the water pump impeller and lower oil. Pull the sparkplugs and squirt a little Kreep, 2cycle oil or Marvel Mystery oil in each cylinder before starting. Charge, check and clean all battery`s. Visually inspect all fuel and oil hoses.
The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD