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NGK C8HSA spark plug. 10mm threads, 1/2" reach, 5/8" hex, gasket seat, non-resistor plug. Stock plug for use with Trevor Simpson GSR40 head kit. Fits Zenoah G230RC / G260RC / G231PUH / G260PUH / G260PU / G231PUM / G260PUM engines. Also fits Chung Yang CY23RC / CY26RC / CY27RC / CY29RC / GP290 engines