Denso Iridium Spark Plug

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Denso Iridium Spark Plugs The spark plug is an important tuning tool for you kart engine. You use a hotter plug in cooler conditions and cooler plug in warmer conditions. When you go from a cooler to hotter plug you are leaning out the motor slightly.This is the recommended and spec. plug for Rotax. We also prefer it when racing CR125 Stock Honda. Show more