{"product_id":"ngk-3129-spark-plug","title":"NGK 3129 Spark Plug","description":"\u003ch2\u003eNGK 3129 Spark Plug Overview\u003c\/h2\u003e\u003cp\u003eThe NGK 3129 spark plug is built for direct OE-style service on select Mazda RX-7 applications. It combines a copper core center electrode, nickel electrode materials, and a standard design to support consistent ignition performance.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFits 1984 Mazda RX-7, N\/A.\u003c\/li\u003e\n\u003cli\u003eFits 1985 Mazda RX-7, N\/A.\u003c\/li\u003e\n\u003cli\u003ePart number 3129 with NGK BR9EQ-14 specification.\u003c\/li\u003e\n\u003cli\u003e5000 ohm resistance for controlled electrical performance.\u003c\/li\u003e\n\u003cli\u003eFlat seat, 14 mm thread diameter, and 0.75 reach.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eStandard spark plug design for OE-style replacement service.\u003c\/li\u003e\n\u003cli\u003eCopper core center electrode for stable heat transfer.\u003c\/li\u003e\n\u003cli\u003eNickel center and ground electrode tip materials.\u003c\/li\u003e\n\u003cli\u003eRemovable nut terminal for common ignition wire setups.\u003c\/li\u003e\n\u003cli\u003ePre-gapped to 0.056 inch.\u003c\/li\u003e\n\u003cli\u003eFour ground electrodes for the specified plug design.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Description\u003c\/h2\u003e\u003cp\u003eNGK 3129 is a standard spark plug identified by BR9EQ-14 specifications and engineered to match the requirements listed for select Mazda RX-7 models. The plug uses a copper core center electrode, nickel tip materials, a flat seat, and a 14 mm thread diameter with 0.75 reach. Its 5000 ohm resistance and 0.056 inch pre-gap support consistent ignition system operation, while the removable nut terminal provides a familiar connection style for service work. This part cross-references Anchor 3129 for the same application.\u003c\/p\u003e\u003ch2\u003eCommon Issues It May Address\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eHard starting caused by worn spark plug electrodes.\u003c\/li\u003e\n\u003cli\u003eRough idle from inconsistent ignition firing.\u003c\/li\u003e\n\u003cli\u003eMisfire symptoms related to plug wear or gap drift.\u003c\/li\u003e\n\u003cli\u003eReduced combustion efficiency from aged ignition components.\u003c\/li\u003e\n\u003cli\u003eService replacement needs for the specified Mazda RX-7 applications.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eVerify the BR9EQ-14 specification, thread diameter, reach, seat type, and pre-gap before installation. Confirm the ignition wire terminal style matches the removable nut design. Use the listed fitment only for 1984 and 1985 Mazda RX-7 applications.\u003c\/p\u003e\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\u003cp\u003eNGK is a major OE supplier of spark plugs in North America and has more than 80 years of automotive manufacturing experience. The brand states that it maintains original equipment standards for durability and operational performance.\u003c\/p\u003e","brand":"NGK","offers":[{"title":"Default Title","offer_id":53505783693493,"sku":"BCDP-3129","price":16.04,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/NG_3129_Fro.jpg?v=1791703344","url":"https:\/\/www.partcatalog.com\/products\/ngk-3129-spark-plug","provider":"PartCatalog","version":"1.0","type":"link"}