If it is going away for the whole winter, change the oil, fill the fuel tank and add a stabilizer then run the engin so stabilized fuel in in teh whole system. Pull the spark plugs and put just a little oil in each cylinder, put plugs back in. Put the bike up on stands or over fill the tires by 10 lbs of pressure. Hook up a battery tender. In the spring change the oil and enjoy.
If you ride some, fill the tank and add stabilizer. Run the engine so that stabilized fuel is in the whole system. Put bike on stands or over fill the tires by 10 lbs. I start my bike up at least once a week if I can't ride it.
Damn it's hard to type with a one year old on your lap!