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Registered
Join Date: Sep 2007
Location: Ventura County, CA
Posts: 4,018
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Have you tried it yet to check the speed?
I did this for years in an 21' SeaRay with a 175hp 2-stoke Mercury outboard. I never had any issues with overheating. The biggest problem was maintaining a slow enough speed for freshwater trolling with downriggers. It was OK for Rapala's and flashers, but not down-rigging. I fabricated a flat plate that hinged down behind the propeller. Now you can buy them for most outboards.
Of course the best option is a little kicker for trolling, but I understand not wanting to drill the transom.
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Craig T
Volvo V60 - Daily Driver (I love it!)
997 Turbo - FVD Exhaust, GIAC Tune - 542 dyno hp on 93 oct
1972 Chevy K-10 Pick-Up Truck Hugger Orange 
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