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NGK spark plug ER 9 EH-6N (1673)

Order ID 50070101450
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NGK spark plug ER 9 EH-6N (1673)

Order ID 50070101450
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NGK Spark Plug ER 9 EH-6N (1673)

High quality at a reasonable price, which is why NGK is the original equipment supplier for so many motorcycle manufacturers.


  • E = thread diameter: 8.0 mm, Spanner width: 13 mm
  • R = with interference suppression resistance (5 kOhm)   
  • 9 = heat value
  • EH = thread length: 19.0 mm executed halfway through
  • -6N = special ground electrode

Corresponds to Piaggio OEM 641 387.

For a technically correct mounting, spark plugs must generally always be mounted with the appropriate torque spanner.
In order to prevent damage to the spark plugs or engine by improper installation, tighten them to the tolerances specified on the packaging:

Price each