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Genuine DENSO IW31 Iridium spark plug, engineered for high-performance 2-stroke and 4-stroke engines
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Ultra-fine 0.4mm iridium center electrode enhances ignition efficiency and throttle response
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360° laser-welded construction ensures durability under extreme conditions
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Heat range 31 (colder than IW29) – suitable for high-compression or high-RPM engines requiring cooler combustion
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Standard 14mm thread, 19mm reach, 20.6mm (13/16") hex size, flat seat
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Resistor type (5K ohm) with a tapered ground electrode for improved flame propagation
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Compatible with various high-performance engines, including Rotax Max and IAME X30
