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spark plugs

  1. ProCross (2012 - )
    My 2002 mxz 500 takes spark plug NGK BR9ES ...... a person at l&m fleet supply sold me BR8ES NGK plugs and told me they will make it run better without fowling out so much they run hotter .... my question is should I run these BR8ES plugs ? Will it cause harm ? Will it be safe ?
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