I know this forum is for offshore performance boats, but I have a couple of questions for winterizing PWC's. Is it better to winterize with Fuel and Oil tanks empty or full? Aside from battery removal, are there any other things I should do?

Empty most of the fuel, use stabil for the rest. The oil should be fine.

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I store my Ski's with as little fuel as possible, stabalize whats left, and I fill the oil resevoir to the top.

If it's carb. you can take as much fuel out as you can and run the carbs dry with the fuel valve off. If it's injected put some stabilizer in it and run it for a while to get stab. in fuel system. Pull plugs and put a shot of oil in the cylinders. Sometimes water stays in the waterbox, so dump a little anti-freeze in it. Pull battery.