It definitely wouldn't hurt to put some fresh gas in the tank, especially if the fuel collected any condensation for sitting so long. Do you know if the guy actually winterized the boat?
When we had a our 2-stroke, we kept it in the garage where it stayed warm so we just added fuel stabilizer and disconnected the battery. Typically at the beginning of the season I would charge the battery then I would hook the hose up and flush everything out. It would run "really" smoky due to the fuel stabilizer being burned off. Once this tank had been completely burn off during the first outing then everything was good to go.
I don't know if he winterized it. I think that he just made sure all the water was out of the lines and then he put stabalizer in it. Here in the Willamette Valley it only gets below freezing once or twice and even then it's right around 32 degrees out. I just want to make sure that I don't mess anything up. I just talked to a boat repair place not a seadoo dealership as they are closed today and they said change the plugs replace the battery and fire it up. Do you think that'll be fine without it being winterized? Also should I grease anything or spray lube any where first? Thank you