A 15 pitch prop should put you where you need to be with that engine. Over propping or mounting the engine will lug the engine, and lead to a very short lifespan. 2 strokes HATE being over propped, and is a HUGE killer of powerheads. This is why EVINRUDE now sets up each and every boat sold with an ETEC as it was found improper setup was the cause of almost all of the early ETEC failures. Under propping and spinning it up to high isn't that bad, but over propping and over loading will kill one in a HURRY!
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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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