Briggs & Stratton Spark Plug #491055/ Compares to Champion RC12Y
Champion Spark Plug, Resistor, For Use With Briggs & Stratton GAS ENGINES -- Intek, Vanguard single cylinder OHV Kohler GAS ENGINES -- Command OHV, K series, 16.0/TH16, 18.0/TH18, Application Champion/rc12yc