{"product_id":"ngk-4015-spark-plug","title":"NGK 4015 Spark Plug","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\u003cp\u003eNGK Racing Spark Plug 4015 is a performance ignition component built around a copper core center electrode, nickel tip materials, and a standard ground electrode design. It is specified with a 0.024-inch pre-gap and a 5000 resistance value for race kart applications.\u003c\/p\u003e\u003cp\u003eFits 1992-1993 Yamaha YZ125, N\/A and fits 1999-2004 Yamaha YZ125, N\/A. This NGK YZ125 spark plug is identified by part number 4015 and BR9EG SOLID.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eCopper core center electrode for stable ignition performance.\u003c\/li\u003e\n\u003cli\u003eNickel center and ground electrode tip materials.\u003c\/li\u003e\n\u003cli\u003e0.024-inch pre-gap for the listed application.\u003c\/li\u003e\n\u003cli\u003eStandard ground configuration with a flat seat design.\u003c\/li\u003e\n\u003cli\u003e14 mm thread diameter, 0.75-inch reach, and 13\/16-inch hex size.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Description\u003c\/h2\u003e\u003cp\u003eNGK 4015, also listed as BR9EG SOLID, is a racing spark plug with a non-removable nut terminal and a manufacturer heat range of 9. The standard ground electrode layout and single ground electrode design support consistent spark delivery in demanding secondary ignition use. For buyers searching for a Yamaha YZ125 spark plug or NGK 4015 replacement, this part matches the listed race kart fitment and gap specification.\u003c\/p\u003e\u003ch2\u003eCommon Uses\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eReplacing a worn or fouled racing spark plug.\u003c\/li\u003e\n\u003cli\u003eRestoring consistent ignition in race kart use.\u003c\/li\u003e\n\u003cli\u003eAddressing misfire caused by incorrect plug gap.\u003c\/li\u003e\n\u003cli\u003eReplacing a plug with the wrong heat range or reach.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\u003cp\u003eVerify the thread diameter, reach, seat type, and pre-gap before installation. Confirm the application matches the listed Yamaha YZ125 fitment and use the specified 0.024-inch gap for the intended setup. Check the ignition system condition and cylinder head threads during service.\u003c\/p\u003e","brand":"NGK","offers":[{"title":"Default Title","offer_id":53725762158773,"sku":"BCDP-4015","price":14.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/NG_4015_Fro.jpg?v=1794209607","url":"https:\/\/www.partcatalog.com\/products\/ngk-4015-spark-plug","provider":"PartCatalog","version":"1.0","type":"link"}