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If they are stock with no mods, pipes, clutch.
Yes BR9ES is what you want.
If you find it smoking alot, (after warm up) or its sluggish in the throttle and theres an excess of black oily deposit on the plug then you can bring it up one heat range to BR8ES.

I had a few of the jags and ran BR8ES and I found them to start and run better.
 
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