{"product_id":"ngk-90398-spark-plug","title":"NGK 90398 Spark Plug","description":"\u003ch2\u003eNGK 90398 Standard Spark Plug\u003c\/h2\u003e\u003cp\u003eNGK 90398 is a standard spark plug built with a copper center electrode core, nickel center and ground electrode tips, and a resistor design. It is specified with a 0.016-inch pre-gap, flat seat, and 10 mm thread diameter for precise ignition service.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eStandard spark plug design for consistent ignition performance.\u003c\/li\u003e\n\u003cli\u003eCopper core with nickel electrode materials for stable conductivity and wear resistance.\u003c\/li\u003e\n\u003cli\u003eResistor construction helps control electrical noise in the ignition system.\u003c\/li\u003e\n\u003cli\u003eFlat seat and 26.5 reach for the specified application.\u003c\/li\u003e\n\u003cli\u003ePart number 90398, also identified as LMAR8E-J.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Description\u003c\/h2\u003e\u003cp\u003eThis NGK spark plug is engineered to OE standards and reflects the brand’s long-standing role as a major original equipment supplier. The 90398 spark plug uses a stud terminal, 14 mm hex, and standard ground configuration, making it a precise replacement for the listed applications. For buyers searching for a Yamaha WR250F spark plug or Yamaha YZ250FX spark plug, this part number 90398 matches the specified fitment and factory-style gap requirement.\u003c\/p\u003e\u003cp\u003eNGK’s Standard Spark Plug line focuses on dependable ignition service with materials and dimensions selected for controlled spark delivery and consistent operation. The LMAR8E-J \/ 90398 designation helps confirm the exact replacement when cross-checking catalog listings or service references.\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 a worn plug with incorrect gap or electrode wear.\u003c\/li\u003e\n\u003cli\u003eAddressing hard starting caused by ignition degradation.\u003c\/li\u003e\n\u003cli\u003eCorrecting misfire symptoms tied to plug condition.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eFits 2020-2021 Yamaha WR250F, N\/A. Fits 2020-2021 Yamaha YZ250FX, N\/A. Verify the 0.016-inch gap before installation and confirm the thread diameter, reach, and seat type match the engine specification. Use the part number 90398 and LMAR8E-J to confirm the correct application during service lookup.\u003c\/p\u003e\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\u003cp\u003eNGK states that it manufactures spark plugs to original equipment standards and supports a broad range of automotive and powersports applications. The brand’s OE supplier background and North American manufacturing presence support consistent product control and application accuracy.\u003c\/p\u003e","brand":"NGK","offers":[{"title":"Default Title","offer_id":53725805084853,"sku":"BCDP-90398","price":21.57,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/NG_90398_Fro.jpg?v=1794211419","url":"https:\/\/www.partcatalog.com\/products\/ngk-90398-spark-plug","provider":"PartCatalog","version":"1.0","type":"link"}