Black Soot
#1
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Location: Haslet, Texas
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Black Soot
I have 496 Mag 375 HP with 72 hrs and I am still getting that nasty soot on the back of my boat. Would it be worth reprogramming my ECM to lean it out some. Will it hurt my motor by doing this.
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What octane fuel are you running? If it is higher than 87 try running that in it. I know a guy who was having the same problem, he out 87 in it and has not had any problems since.
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Are you running 87 octane? If your trying to pump a higher octane (89 or 91) in that motor you'll get more residue and your just wasting your money. Will leaning out the motor hurt it? If your running high RPM's with a lean mixture your definitly going to reduce the life of the motor over time (maybe a short time). If you get a bad load of gas onetime don't blame Mercury when something goes wrong. Richer is always better! Leave the stock motor alone and just remember to bring the Simple Green along.
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I have the same thig with a new carbed motor, I pulled a couple plugs out and they looked great. i wonder how much of the soot is from inital start up and warm up time. Especially with mine having a choke.