UR4 V-Power Spark Plug | NGK 6630

Boat engine manufacturers from Volvo Penta to Evinrude use NGK 6630 spark plugs as the factory igniters. UR4 V-Power spark plugs have nickel alloy electrodes with a V-cut that sends the spark to the plug’s engine. This means a faster-developing spark and more efficient ignition than conventional plugs. The plugs also have trivalent metal plating to resist seizing and a 98% copper core for excellent conductivity and thermal control. Cold-rolled threads ensure an excellent, long-lasting fit.

NGK UR4 spark plugs deliver the superior performance and longevity boat owners need with excellent value. We’ll ship them from the nearest warehouse in our coast-to-coast network and can answer any questions by phone or email.

• An OEM spark plug for many marine inboard and outboard engines.
• 14mm x 1.25mm thread
• 11.6mm thread length
• Gap: 0.039 inches (1mm)
• Hex Nut: 5/8-inch (16mm)
• Includes 5,000-ohm resistor
• 60-day manufacturer’s warranty
• Part number UR4
• Stock number 6630
• Replaces Champion RV15YC4
• Replaces OMC/Johnson/Evinrude 3854400
• Replaces Volvo Penta 3851861