Well, sometimes starters don't work, and some planes don't have 'em.
I was never worried about winding a prop, and if you listen hard enough you may hear a "hiss" from that nasty crack in the cyl. head.
But I was always scared of people, me included, working around a running engine. Too many just walk into them. One mongrel, I had to leave running all day, during refuel, oil top up, and lunch and smoko.
If you told the boss the damned thing just won't start, he'd say, well just fly her back to base.
