What is a Resistor Spark Plug?

Excellent quality spark plug caps - used by racers worldwide. These caps are designed to reduce electromagnetic Interference as well as radio

NGK High Quality Resistor Spark Plug Cap (Stud Over Nipple) (5Kohms-90degree-OverNipple)

Technical Information Non-Resistor Spark Plugs

Tri-Spark Blog Spark Plug Caps - Spark Plugs - Resistor/Non Resistor

Spark plugs - Resistor 'v' Non-resistor - effect on HT voltage #1450

Spark Plug Cap - Plug Covers, Resistor Caps

Copper-glass seal bonds insulator, terminal post, and center electrode together to provide a tight seal that is 100 percent leak-proof Cold-formed

Autolite 65-4PK Copper Resistor Spark Plug, 4 Pack

Spark plug cap Triumph Rat Motorcycle Forums

Resistor Cap Manufacturer & Suppliers

NGK Resistor V-Groove Spark Plug - FR5-1

NGK Spark Resistor Cover

NGK BP7ES discontinued, now BPR7ES?

What is a resistor spark plug? — Shamenormalcy: MrDailyDriver

NGK R? R means resistor type - Niterra Philippines, Inc

Resistor plugs & resistor wires? - Don Terrill's Speed-Talk