5200-5500 is fine for that engine. The 60 degree engines turn less RPM's than the 90 degree engines do. 5500 is the max WOT RPM's for a 150 IMHO with there smaller porting and carbs. Make sure ytou are getting WOT at the carbs, but do NOT run the engine with the airbox off.
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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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