You may have been running lean before at WOT. 40:1 will actually lean your fuel mixture out vs 50:1. At 40:1 your fuel is denser and slightly thicker which makes it go through the jets slower. 50:1 will fatten your top end out slightly.
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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
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