NGK ER9EH-6N spark plug for Piaggio 4t 4-valve engines. Specifically designed for Vespa LX 4T 4V and Primavera 4T. TECHNICAL SPECIFICATIONS: 13mm socket wrench. Thread diameter 8.0 mm. Thread length 12.7+6.3 mm. Electrode gap of 0.6 mm. Spark plug with a resistance of 5kohm. Spark plug specifically designed for PIAGGIO 4T 4V scooters.
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