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Old 07-02-2016, 06:45 AM   #8
Steve
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City: Thibodaux, Louisiana
Vessel Name: Gumbo
Vessel Model: 2003 Monk 36
Join Date: Oct 2007
Posts: 3,882
Years ago used them in some Ag. tractors. Black smoke was usually a sign of a dirty air filter, from dusty field work. Normally that's not a problem on a boat but maybe check your air cleaner filter to be sure it is clean and in good shape.
It could be other things but this is an easy one to check first.
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