It sounds like you need to drop down to a 15 pitch prop for it. Also it may be worth checking to make sure it has the 2.25:1 lower unit gears. Alot of the V4 large gear cases fail, and get swapped out for V6 gear cases(same size), but the V6 case has 1.86:1 gears and the V4 version of it has 2.25:1 gears. Put the engine in gear, mark the prop and flywheel, and see how many rotations of the flywheel it takes for 1 revolution of the prop.
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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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