I used to be a certified outboard engine mechanic and those engines are some of the most harshest run engines I can think of. Most people who own a boat only know two throttle positions. Low idle or full throttle. Kind of like a lot of people that fly RC. Most of these engine manufacturerers recomend a brek-in procedure that specifies running more oil during break-in and not running extended periods at either idle or full throttle. They also recomend that you not run at any one throttle setting for any extended period of time. This is basically how I break-in any new engine no matter what it is on. Strap the engine to the plane run it on the ground long enough to get it adjusted right and then fly it. Just take it easy while flying and keep varying the throttle.