Re: winterizing a 115 EFI motor
I assume we are talking about a 2 stroke?
Filling the tank is reccomended, but I've stored plenty half full and never had an issue, even with E10, as long as you stabilize it correctly, but safest is to fill it up. Regular Stabil is useless with E10, you need to use something that treats the Ethanol, such as Star Tron or the Stabil Ethanol treatment. Double treat for winter storage and run it through the entire fuel system, as DJ suggests.
When it's up at NOT is when you spray fogging oil into the intake, if you do that when the engine isn't running, you are not doing anything...except wasting fogging oil. Run it, spray fogging oil in, ususllay 2 second burts per cylinder and then a constant spray until it loads up good or you stall it out, then you know the internals are coated well. I don't bother with removing the plugs and spraying into the cylinders as they will be pretty well coated from burning the fogging oil.
Don't pull the fuel line and run it out of fuel, you are much better off leaving the system full of treated fuel rather than empty or half empty with air in there.