Re: trolling with main motor
Yes, blow the soot out once in awhile and have had no problems.....yet.
A good analogy is smoking. One pack a day for a year - will you get cancer? Probably not. 2 years, 5 years, 30 years.??? In other words, its a progressive thing.
The more you idle it, the worse it will get. If you have a VRO system I would be less concerned. But if you pre-mix at 50:1 eventually you will get gunked up. I'd use engine tuner religiously if it were me.