Now this has me thinking..maybe better to find one of those real cheap with a dead electric motor, and see if a cheap gas lawnmower engine could be fitted to it somehow. No worries about overheating or waiting around then.
ya, I know they make the lewis winch to use a chainsaw..too expensive and wuss, I would want a 4 stroke for that job, cheaper, and something with oil in a crankcase..maybe a harbor freight on sale honda clone, around 6 horse?? something like that.
Off to google to see if this exists already...