I would check the tach first if it was me. Since you say it is a DT150 it most likely has a rev limiter in it that would have shut it down to 3000 if it went up that high in the RPM's for anytime. Also are you sure you got the right lower unit back on it? There are 2 or 3 different lower units that will fit on that engine if it's a 20" shaft.
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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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