Bought a boat with a DF50 2002 last week. Ran it for the first time today. Went for a quick ride, running 2-3000 rpm's, for 5-10 minutes, 6000 for about a minute, and 2-3000 again for 5 minutes. Ran very smoothly.
Went out about an hour later, once again it ran smooth, but when I hit 3000revs...
