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I'd pull the plugs, clamp off the fuel line, and see if you can turn the engine over by hand, or with the battery. That would make sure the engine or pump isn't locked. It would be a good idea to check the compression at this point also, if it is turning over OK, to give you a good initial starting reading for future reference.

I would also clean the carbs before you try to start it. If they have been sitting for 3 years with fuel, they will definitely be gummed up. This also goes for the fuel filter.

Check oil lines etc.. Rubber lines can dry out and crack. Consider going pre-mix if not already converted.

Good Luck!
 

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Seafoam is great for cleaning carbs/injectors, but it has no fuel stabilization properties, so it won't do anything to revive bad fuel (nothing will). Products like Sta-bil, and Starbrite will help stabilize fresh fuel, but nothing really removes moisture from old fuel. I'd drain the tank if the fuel has been sitting.........you get lots of water just from condensation.
 
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