Make sure the electrical or hydraulic controls are connected properly and the tabs can move easily. Lightly grease the pistons, seals and shafts if required. Be sure the transom door can open properly and was not damaged last season. Lube the hinges, then check the stern platform. It should not move, and fittings should show no signs of corrosion.
Most yards recommend repacking the stuffing box every two or three years.
If you didn t change the oil last fall, do it now. Next, check the transmission fluid levels and top off. You might want to change it if you use your engine a lot. If you topped off your fuel tank in the hope of preventing condensation, put some fuel additive in the tank and run the engine to clean out the old fuel in the carburetor. In my opinion, you re better off completely draining your tanks in the fall and starting with fresh fuel in the spring.