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I can't tell the difference between BR9ES and BR9ES I use 1 of each in my sled LOL . I think you made a typo...

Spaceman
Mean Green Racing
Elyria, Ohio
 

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What plug came with the sled? I think that the number "9" is the heat range of the plug. I don't remember if a lower number is a lower or higher heat, I think that it is hotter. Ask your a dealer what plug goes in that machine, and I would stick with NGK my dad's 1998 700 RMK went over 5000 miles with the original set of plugs.

Snowmachining is not a thing to do - its a way of life
 

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The plug will be a bit cooler and may or may not run better. Don't use plugs to correct rich or lean mixtures. With going cooler the worst that can happen is a fouled plug.

Seeing it's a cat, AC has a special plug through NGK for high output ignitions. I think it's the BR*EYA.

 

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I'm pretty sure the slead came with 9's I would suggest staying with NGK BR9EYA's
the manufactures spent hundreds of thousands of dollars designing their machine to run well I doubt they over looked the spark plug.
 
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