Description
Autolite 2543 Copper Core Resistor Spark Plug
Copper Core Electrode: Enhances thermal conductivity and resists fouling
Projected Power Tip: Extends into the combustion chamber for better self-cleaning and reduced pre-ignition
Multi-Rib Ceramic Insulator: Prevents flash-over and improves dielectric strength
Cold-Formed Steel Shell: Precision-rolled threads for durability
Copper-Glass Seal: Leak-proof design ensures full voltage at the spark gap
Reliable Starts & Fuel Efficiency: Engineered for consistent ignition and smooth acceleration
Key Features
Thread Size: 14mm x 1.25
Reach: 18mm (0.709 in)
Seat Type: Tapered
Hex Size: 5/8 in (16 mm)
Terminal Type: Solid
Center Electrode: Nickel, 2.5mm projected tip
Ground Electrode: Nickel, standard type
Resistor: Yes (~4000–5000 Ohms)
Shell: Extended metal shell, nickel-plated
Torque Spec: 7–15 lb-ft (cast iron or aluminum)
Warranty: 2-Year Limited Warranty
Longevity: Up to 30,000 miles
Refer to original manufacturer for any applicable warranties.
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