5100 is a tad low, but not bad for a 60 degree EAGLE looper. They don't like to turn more than 5500-5600 as they are built pretty heavy inside for commercial type useage. 4 strokes do best at lower RPM's, at WOT a 4 stroke isn't that much better on fuel burn than a 2 stroke, maybe 10% better. At idle though they can be up to 400% better.
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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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