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Just bought a 97 Grand Touring 700 SE. This sled came with NGK BR9EYA plugs, but Royal Distrubuting said to use BR10ES. Any sugguestions as to which is right?
 

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The original spec for your sled was BR10ES. Later, Doo updated it saying the BR9ES is the recommended factory plug. I personally use BR9EYA in my sled, starts easier, fouls out less. I have stock jetting in my 97 Mach 1 700 triple, and I can easily run a couple years on 1 set of plugs, even when riding when it's 40 degrees F out.
 
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