Sounds like you've got a 150 2.0L, if so it will have a 2:1 ratio in the lower unit which will need a higher pitch prop. A 19 MIRAGE for a 150 would be a good prop to try. Just remember that the MIRAGE is not a top speed prop. You might also need to reset your engine height for it, and make sure your tach is correct as propping with an innacurate tach is bad news.
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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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