NGK 6376 LFR5A-11 V-Power Spark Plug. NGK&';s V-Power Plugs Feature a Unique V-Cut in the Center Electrode that Directs the Spark to the Edge of the Electrode, Helping the Spark Develop More Rapidly, Increasing Ignitability and Reducing Quenching. Fits Mariner, Mercury and Yamaha outboard engines.