You either have a small paddle wheel attached to the transom or in a thru hull fitting, or more likely a small plastic nozzle looking thing on your transom with a black 1/4" hose coming off it. It is a water pickup, and sometimes the little hole gets clogged. Pull off the black tube and clean out the hole, compressed air, straight pin, whatever. If it's a paddle wheel, check to make sure it is not damaged and that it spins. Good luck!
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