Baffled. I have spark and fuel - no start. I cannot envision a scenario where the timing changed just from sitting. The only thing left is the carb. I probably need to pull it off, open up the bowls and clean them out, drain all the old gas (thereby throwing away the 5 gallons I added to the tank today), and then see what happens. Nothing else makes sense. These engines are mindlessly simple.....spark, fuel, air........spark verified good. Air verified good by the fact I am alive while breathing it. The only thing left is fuel quality/delivery. A buddy called earlier about this evening's plans and I told him what was going on......he recommended I try SeaFoam......maybe I'll run to Napa and read the can tomorrow, but generally speaking I am not a fan of any type of snake oil...........