I would recheck your tach first. My 1.6L with a 13X15 on it would only spin up to 5300 at 28MPH. Something doesn't add up with your numbers as a 17 pitch with a 2:1 lower unit at 5500 should be running around 40 MPH.
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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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