If the problem truly started with a water pump replacement, then it is one of 2 things. Either he didnt get a good seal on the water pump base gasket or o ring, or he opened up the speedo port when he did the pump. There is a blocked off port under the water pump on some SUZUKI lowers, and if it gets opened it will suck air on plane but pump when the lower is submerged. My dad did this to our old 25HP before, bad part was it took the head gasket, exhaust gasket, and engine temp sensor with it.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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