Take some two stroke oil and drip it in the carb and cylinder plug hole and turn it over (shaft). You can also use a fogging oil if the carb opening is relatively accessible. I would try to rotate the shaft a couple of times about every two weeks or so too! If you want to leave the tank full (reduce moisture in tank), make sure you do as stated above and put Sta-bil in the gas. I would then 86 that gas come first flight after you have used it to clear out all the oil!