I keep the batterys charged. I use after run oil if my engine
is going to set for any length of time. I remove all fuel from the
fuel tanks/engine before storage.I clean all my air planes
after each flying sesion and before i store them up for the winter.
At times i will turn the props over on my air planes off and on
thru out the storage months. I only use os,ys,saito,enya engines
and i have never had any problems with engines for the next season.
I also fly in the winter months some with snow skies( Its Neat) lol