Direct replacement spark plug for riding mowers and other 4-cycle small engines from Briggs & Stratton, Kohler, and Kawasaki. Drop-in replacement for Champion RC12YC, Autolite 3924, and NGK BKR5E with matching specifications for reliable ignition performance.

• Thread diameter: 14mm, thread reach: 19mm (3/4 in)
• Hex size: 16mm (5/8 in)
• Gap: 0.035 in (preset)
• Resistor type with copper core electrode
• Flat seat with gasket
• Replaces Champion RC12YC, Autolite 3924, NGK BKR5E