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06-14-2009, 10:55 AM #1
Drilling Out Exhaust on 200 Blackmax
I have a 21 Checkmate Enchanter with a 1989 Mercury 200 hp Blackmax. The engine is in great condition. I am in the process of upgrading the carbs and heads, and I have always wanted to drill out the exhaust in the midsection of the outboard since I bought it. My only concern is that I have never done a modification like this before so I don't know the correct drilling location, or what size the holes should be. Any information on drilling location, and steps for the procedure would be greatly appreciated.