Is it time for a new spark plug for your go-kart or mini bike Our high quality F7RTC spark plug is just what your machine wants to keep its engine roaring Is it time for a new spark plug for your go-kart or mini bike Our high quality F7RTC spark plug is just what your machine wants to keep its engine roaring 30 Day Warranty Is it time for a new spark plug for your go-kart or mini bike Our high quality F7RTC spark plug is just what your machine wants to keep its engine roaring. This Torch F7RTC/Champion RN9YC spark plug is found on a bewildering multiplicity of small 6.5 hp gas engines, providing the igniting spark for everything from Baja Mini Bikes to the Motovox MBX20, to generators, log-splitters, pressure sprayers, pumps, and a myriad of other applications. If it turns gasoline into noise, chances are it uses this ubiquitous spark plug.