{"product_id":"ngk-95521-spark-plug","title":"NGK 95521 Spark Plug","description":"\u003ch2\u003eNGK 95521 Standard Spark Plug\u003c\/h2\u003e\u003cp\u003eNGK 95521 is a standard spark plug built for snowmobile applications that call for a 14 mm thread, 0.75 inch reach, and flat seat design. It uses a copper core center electrode with nickel electrode materials and a 5000 ohm resistor for stable ignition performance.\u003c\/p\u003e\u003cp\u003eCompatible with a wide range of Polaris and Ski-Doo models, this spark plug supports OE-style service replacement for 600 EFI, 650, 850, and Patriot 9R applications. The NGK 95521 part number is also identified as BPR8ES SOLID.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eStandard spark plug design for snowmobile ignition service\u003c\/li\u003e\n\u003cli\u003eCopper core center electrode for consistent heat transfer\u003c\/li\u003e\n\u003cli\u003eNickel center and ground electrode materials\u003c\/li\u003e\n\u003cli\u003e5000 ohm resistor for electrical noise suppression\u003c\/li\u003e\n\u003cli\u003eFlat seat, 14 mm thread, and 0.75 inch reach\u003c\/li\u003e\n\u003cli\u003ePre-gapped to 0.031 inch\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Description\u003c\/h2\u003e\u003cp\u003eNGK 95521 is a direct-fit style spark plug for many Polaris and Ski-Doo snowmobiles, including 2025-2026 Polaris 650 INDY Adventure 137, 850 PRO-RMK 155, Patriot Boost RMK KHAOS 165, and 2023-2024 Ski-Doo Backcountry Sport 600 EFI, Expedition Sport 600 EFI, and Tundra Sport 600 EFI. It is also listed for additional Polaris 650, 850, and Patriot 9R models across 2025-2026, plus several 2021-2024 Ski-Doo 600 EFI applications. The NGK 95521 spark plug is specified with a stud terminal, standard ground configuration, and a manufacturer heat range of 8.\u003c\/p\u003e\u003cp\u003eThis part cross-references NGK (e.g., 95521) for the same application.\u003c\/p\u003e\u003ch2\u003eWhat It Is Used For\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eReplacing a worn or fouled spark plug\u003c\/li\u003e\n\u003cli\u003eRestoring reliable ignition in cold-weather operation\u003c\/li\u003e\n\u003cli\u003eAddressing hard starting or misfire symptoms tied to plug wear\u003c\/li\u003e\n\u003cli\u003eMaintaining proper combustion in EFI snowmobile engines\u003c\/li\u003e\n\u003cli\u003eServicing OE-recommended spark plug applications\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cp\u003eVerify the specified gap before installation, especially on Ski-Doo applications that note a 0.032 inch OEM recommendation. Confirm the thread diameter, reach, seat type, and terminal style match the engine specification before service. Use the listed fitment data for the exact model and year, including Polaris 650 INDY, 850 RMK, and Ski-Doo 600 EFI applications.\u003c\/p\u003e\u003ch2\u003eQuality Assurance\u003c\/h2\u003e\u003cp\u003eNGK is a recognized ignition component manufacturer, and this spark plug is built to the listed OE-style specifications for the applications shown. The part number 95521 is provided for accurate identification and service matching.\u003c\/p\u003e","brand":"NGK","offers":[{"title":"Default Title","offer_id":53725810393269,"sku":"BCDP-95521","price":10.98,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/NG_95521_Fro.jpg?v=1794211587","url":"https:\/\/www.partcatalog.com\/products\/ngk-95521-spark-plug","provider":"PartCatalog","version":"1.0","type":"link"}