UR5 V-Power Spark Plug | NGK 2771 Premium NGK spark plugs are known for their reliable performance and superior anti-fouling characteristics. NGK spark plug UR5 Stock number 2771 14mm thread size 11.6mm thread length Resistor Tapered seat V-Power Type Gap 0.039 in. (1.0mm) 5/8 in. or 16mm hex Replaces Champion RV12YC Replaces Indmar 985026 Replaces OMC/Johnson/Evinrude 912937 Replaces Pleasurecraft Marine RP030002