exhuast soot on transom

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Jan 22, 2008
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Oday 30 Huntington
1982 O'Day 30 with 2 cyl universal engine about 1500 hrs and a 2-blade folding prop leaves exhaust soot on transom with every use. I scrub it off with simple green, but concerned that this is not normal and indicates a problem. Any ideas?
 
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