Champion RC12YC Spark Plug, utilized in 4-stroke racing engines. This spark plug was the specified spark plug for the Briggs & Stratton 4-Stroke LO206 Racing engine - this has been replaced by the Autolite AR3910x spark plug, available here.
Overview
This spark plug is noted by a Briggs & Stratton logo on it, and the notation "RC 12YC" on the plug.
Complete spark plug is ideal for the 206 racing engine, and a 5/8" hex-wrench fitting is integrated onto the plug.
Each spark plug sold separately. Each plug includes an integrated crush gasket for proper sealing of combustion chamber gasses.