Nothing yet is beating a simple old piston port two stroke for starting with some ease in the cold. And a fan-cooled is the best way to insure the ability to cool the engine when running at work speed. Liquid-cooleds - and I like them- require much more maintenance and rebuilding out on the coast where snow is hard. I can't imagine having to go through a four-stroke engine on a regular basis due to overheating damage. (And don't forget to keep the crankcase breather clear or you'll blow seals.)
