Seller notes

Fits 1971 Yamaha DT1MX Copper Plus Non-Resistor Spark Plug Copper core center electrode for accurate heat control Optimizes performance and longevity Patented SAC 9 resistor for EMI and RFI suppression Ultraseal coated shell prevents rust Copper Plus spark plug has a copper core center electrode that allows for accurate control of heat range, optimizing performance, and longevity of the spark plug. - Patented SAC-9 semi-conductor resistor for maximum EMI and RFI suppression. - Patented Ultraseal...

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