I usually run the motor to warm it up but I pull the fuel shut off half way or so, and let it lean the motor at idle. Builds heat very quickly in the motor.I am planning on putting on a heater put I still will heat the motor the way I have as well. Also don't let the fuel sit in the system for long. A day or two is the max. Blow out your lines,Barrel valve, pump and put a good lube in it like WD-40 or I use Tri-Flow. Tri Flow works very well. I also put a little Tri Flow in the spark plug holes and crank it over a couple times. Everyone has there own way of maintaining an alcohol system.