Outside, I would suggest you obtain some parafin wax paper, and seal the intake and
exhaust. If it is wet
exhaust on a seperate line, closing the seacock should be sufficient. If the
fuel tank is
engine mounted, as opposed to running from your main tank, use the parafin paper to seal the cap, as it is vented, and will allow moisture to ente the tank. Turning the
engine monthly is still a must., and preferably with the
compression released. Keep in mind that if this is done with no fuel in the tank, you will have to bleed the system before you can start the engine. I forget to mention in the other thread, do not leave the
compression release released, as it will weaken the valve springs. If you do not have a
weather tight housing over the unit, get a good quality cover. A plastic tarp will trap moisture, so get one designed to allow moisture out, but not in. Car and motorcycle covers use a
fabric that fits this bill, and I am sure the genset manufacturer can come up with something.
All machinery wears out faster when not being used. In this case, do not spray a solvent based light
oil, like WD40 in the engine, as the oil will not be built up on the cylinders, and the solvent can wash them down exposing the metal to rust.
As for filling with fuel, and running it, that would not hurt as long as you either drain all the fuel from the tank, or keep the tank completely full with Sta-Bil or similar additive. I would recommend the former, as additives in a new engine are a potential source of problems.
One last point, if it is in a housing, put a dessicant bag inside to trap any moisture.