OMC released a bulletin back in the early 90's to supercede teh surface gap plugs to the QL77JC4 gapped plugs due to the tendancy of surface gap plugs to foul out during extended idling. If you're after max performance and run at sustained high RPM's(5K+ RPM's) stay with the UL77V surface gap plugs, otherwise switch over to the QL77JC4's and enjoy better idling and low RPM performance. I avoid the QL78YC's though as I have found teh extended electrode plug to not perform as well down low.
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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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