I use a slightly more aggressive approach to storage. I'll remove the muffler,
put the piston down, and fill the engine with a mix of 50/50 kerosene and motor
oil. Then I'll rock the engine back and forth for a couple minutes to remove all
the old oil, fuel and such from the inside of the engine....then simply pour the
mixture out by holding the engine up side down, and allowing the mixture to
dump out the exhaust port.The kerosene will eventually evaporate, leaving the
internal parts of the engine with a light coating of oil.

Then I'll rinse the carb out with some rubbing alcohol and work the carb back
and forth with the radio control...then I'll blow into the carb with some air, with
the throttle closed to blow out the thinned mixture from the internals of the carb
barrel. I do this about three times to insure I have rinsed all the castor oil out
from the carb barrel. If the carb is not serviced in this, or a similar manner, it
will freeze up as the oil solidifies.....and the carb will be stuck....quite tight.

FBD.