Did you check your safety lanyard? It has happened to the best of us before...if it's not on, the engine will turn over and over without ever actually starting. Check that first, then check into mechanical details. I dont think your injectors would be clogged. being from MN we winterize for several months at a time, and for the past three years, knock on wood for the rest, my boat has turned over on the very first try with gas that is 4-5 months old.
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