Here are a couple things that will help to keep your boat in tip top shape during storage.
The first thing we are looking at is fuel stabilizer which helps to stop condensation forming in the fuel tank and fuel lines and therefore this needs to be added to a full tank of gas first. When adding the fuel stabilizer it is important that you follow the manufacturers instructions to the letter. Now start the motor on flusher for approximately 1 minute in order to push the treated fuel through the fuel system.
Now we come to fogging oil this is applied to the carburetors. You will find that most boat motors have fittings for applying fogging oil. However, if yours does not have such a fitting then you will need to find openings where this oil can be applied (you may even have to remove the carburetor cover to do this). However, what you should remember is that fogging oil will make the motor of the boat smoke more than normal when you run it the first few times.
Next you will need to unhook the flusher and drain the gear case and then refill with fresh lubricant. If you happen to notice water in the flushed lubricant this may be a sign that the shaft seal needs to be replaced. It is important to remember that a bad seal if not replaced could cost you $1,000 or more in repairs.
The spark plugs should be removed and spray fogging oil into the cylinders, also clean the housing and coat electrical connections with an anti-corrosion spray. Also replace the removed spark plugs with new ones.
Next you should inspect the steering all of the cables both on and in the steering column and clean out any grime and then let the shaft air out. Ensure that all cables have been sprayed using anti-corrosion spray.
Now you will need to disconnect the battery and clean all the terminals and spray these with anti-corrosion liquid and then store it properly. Also remember to put the battery on charge for a couple of days each month whilst the boat is in storage.
The motor of your boat should be tilted downward in the running position and cover with a motor cover. It is important that you do not use plastic to cover the motor as it will trap moisture against the motor instead use either a cloth or canvas covering (it allows the motor to breathe).
If your boat is being kept on a trailer inspect it fully and grease all the bearings on it. Also check the tires and spray any unprotected metal or iron parts with an anti-corrosion spray.
Now that you have correctly stored your boat by following the tips above, you will be able to relax and look forward to next season.