NGK CMR7H Spark Plug. 10mm thread, 12mm reach, 14mm hex, gasket seat, resistor plug. Suitable for most R/C 2 stroke Engines 
Zenoah part # 3699-91867
HPI Part # 15454 or 3066
FG Part # 07343/08
Losi Part # LOSR5017

Stock Part for:
Zenoah 2 & 4 Bolt Engines from 23cc - 32cc Also works on most PUH and PUM Motors, also standard part on Chung Yang (CY) 23cc - 32cc 2 & 4 Bolt Engines

Upgrade & Standard for All KingMotor and Rovan Sport Engines.