I wouldn't switch to NGK's unless you want problems. OMC's always seem to run best on CHAMPIONS(at least for me anyways). Your engine calls for 2 different plugs depending on useage. The QL16V is a surface gap plug and is best suited for high RPM running. The QL77JC4 is a great all around plug, and is about all I use in them. Many will run QL78YC's, but I have found them to foul at idle alot, but work great in the higher RPM's.
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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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