Spark Plug NGK ER8EH-N copper M8x1, wrench width 13mm interference suppressed/long thread similar to DENSO IY24/Y24FER-C/Y24FERC (nickel center-electrode) for High End cylinder | SIP-Scootershop
NGK : Standard Plug ER8EH 4011 [ER8EH]
Amazon.com: NGK ER8EH Spark Plug : Automotive
NEW NGK SPARK PLUG Sparkplug ER8EH ER8-EH No 4011 | eBay