The NGK BR10EIX Spark Plug is a cool temperature plug. It is well suited for use in Yamaha, Leopord or 125cc shifter kart engines in warm weather condtions.
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The NGK BR9EIX Spark Plug is a warm temperature plug. It is well suited for use in Yamaha, Leopord or 125cc shifter kart engines in cooler weather condtions.
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