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USE NGK BR9ECS PLUGS. IF PLUGS FOUL OFTEN IT IS OK TO USE NGK BR10ECS (THEY ARE A "HOTTER" PLUG) JUST DON'T USE THEM AT WIDE OPEN THROTTLE FOR EXTENDED PERIODS OF TIME SUCH AS A 10 MILE BLAST ACROSS A LAKE OTHERWISE THEY SEEM TO BE THE BETTER CHOICE OF THE TWO FOR SMOOTH RUNNING. Above answer is wrong. Lower the number, hotter the range

Go to http://www.ngksparkplugs.com/ and learn about heat ratings http://www.ngksparkplugs.com/tech_support/spark_plugs/p2.asp?mode=nml . The lower the number the hotter the plug. Use BR9ECS and make sure they are the 4677 version for Yamaha and not BR9ECS-5 which are for Ski-Doo.

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