How do I winterized a 40hp evenrude 2stroke - Boating

There are videos all over YouTube that cover this subject quite nicely.
winterizing an outboard motor YouTube

Safety First Before you begin to winterize your boat's motor, remove the negative battery cable from the battery. You'll need a 5/16-inch wrench to loosen the nut on the negative lead. You should also remove the propeller from the propeller shaft. Send the propeller to a prop shop for repair and refinishing

Lower Units and Outdrives Water that freezes in your motor's drive can wreak havoc with the drive system of both inboards and inboard-outboards. The water gains access to the drive unit of an outboard motor through faulty water pump seals or prop shaft seals. Changing the lower unit or outdrive oil prevents this. When you drain the oil, look at the color. If it's milky, you have a broken seal that's allowing water to leak into the drive system and the seal needs to be replaced. Feel the oil -- rub a bit of it between your fingers. It shouldn't feel gritty. Some very fine metal particles in the oil are normal and usually aren't noticeable. Gritty lower unit oil means abnormal gear wear

Cooling System Your boat and engine operating manuals tell you the type of cooling system your motor uses. Almost all outboards rely on a raw-water cooling system. The intakes for the system are underwater when the boat's in the water. The intakes pull water into the engine's water pump for distribution throughout the engine. Winterizing these system means cleaning the strainers on the inlet ports. You must replace an outboard motor's water pump outdrives as part of the winterization process.

Fuel Systems Change the fuel filters when you winterize your motor. Most boat motor manufacturers recommend you change fuel filters every 500 hours or once a year. Cold temperatures cause the residual fuel in filters to gum up. If water trapped in the filters freezes, the filter expands and can damage fuel lines.
Automated Winterization Evinrude's E-TEC series outboards feature a self-winterization feature. You connect the outboard to a water source, start the engine and move the throttle to the high-idle-winterization throttle position. The motor's speed will vary and the engine will shut down after about 30 seconds, fully winterized. Whether this feature will eventually appear in other outboard motors remains to be seen. In the meantime, your motor's operator manual contains all the manufacturer's recommendations on preparing your motor to endure winter's inactivity.