The biggest problem is moisture in the fuel which can eventually corrode and foul up the carburetor. Make sure to use a good fuel stabilizer like Star Tron to protect the carburetor.
I just recently took my Champion generator out of storage after 2 years. I thought I'd empty the gas when I stored it. Still had a half a tank of gas. It started after the second pull. Runs like a champ.
After having the carburetors replaced 2 other generators I own the repair shop advised me to use Star Tron stabilizer. I told him I had been using Briggs & Stratton fuel stabilizer. They told me I could continue using it and told me they would be more than happy to replace the carburetors again. They sold both the Star Tron, Stabil and the Briggs & Stratton stabilizers. I've been using Star Tron ever since in all my small engines. Looks like you did a good job protecting the champion. It still has the original carburetor.
