{"product_id":"ngk-5687-spark-plug","title":"NGK 5687 Spark Plug","description":"\u003ch2\u003eIridium IX Spark Plug Overview\u003c\/h2\u003e\u003cp\u003eNGK Iridium IX Spark Plug 5687 is built for applications that call for a 14 mm, flat-seat spark plug with a 1\/2-inch reach and a removable nut terminal. It uses an iridium center electrode, copper core, and nickel ground electrode to support consistent ignition performance. This NGK spark plug 5687 is listed for a wide range of vintage motorcycles and snowmobiles, including Kawasaki, Ski-Doo, and Yamaha applications.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eIridium center electrode tip for stable spark delivery\u003c\/li\u003e\n\u003cli\u003eCopper core center electrode for efficient heat transfer\u003c\/li\u003e\n\u003cli\u003eNickel ground electrode with taper-cut tip design\u003c\/li\u003e\n\u003cli\u003e5000 ohm resistor design for ignition noise control\u003c\/li\u003e\n\u003cli\u003eFlat seat, 14 mm thread, and 13\/16-inch hex\u003c\/li\u003e\n\u003cli\u003ePre-gapped at .032 inches for the base specification\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Product Information\u003c\/h2\u003e\u003cp\u003ePart number 5687, also identified as BR9HIX, is an NGK Iridium IX spark plug engineered around OE-style construction standards. The design combines an iridium firing tip with a copper core center electrode and a standard ground configuration to promote reliable combustion in older two-stroke and small-engine applications. Fitment includes 1967-2000 Kawasaki, 1971-1979 Ski-Doo, 1972 Yamaha CS5, and 1994-2000 Cobra CM50 and BM50 models, with application-specific gap notes listed in the fitment data. This part cross-references Champion Spark Plug 678 and DENSO Auto Parts 5381 for the same application.\u003c\/p\u003e\u003ch2\u003eWhat It Is Used For\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eRestoring weak or inconsistent spark output\u003c\/li\u003e\n\u003cli\u003eReplacing worn plugs with excessive electrode wear\u003c\/li\u003e\n\u003cli\u003eAddressing hard starting caused by plug fouling\u003c\/li\u003e\n\u003cli\u003eImproving ignition stability in older two-stroke engines\u003c\/li\u003e\n\u003cli\u003eMatching the specified heat range and reach for listed applications\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eVerify the listed gap specification for the exact application before installation, since fitment notes vary by vehicle. Confirm the 14 mm thread diameter, 1\/2-inch reach, and flat-seat design match the engine specification. Use the application notes for the correct gap setting on each listed Kawasaki, Ski-Doo, Yamaha, Maico, or Cobra model. Part number 5687 should be checked against the vehicle service information before final tightening.\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 across its spark plug lineup.\u003c\/p\u003e","brand":"NGK","offers":[{"title":"Default Title","offer_id":53725765173429,"sku":"BCDP-5687","price":16.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/NG_5687_Fro.jpg?v=1794209713","url":"https:\/\/www.partcatalog.com\/products\/ngk-5687-spark-plug","provider":"PartCatalog","version":"1.0","type":"link"}