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NGK
Standard Spark PlugNGK 95521 Spark Plug
| Brand | NGK 95521 |
|---|---|
| Resistance | 5000 |
| Ground Electrode Tip Design | - |
| Ground Configuration | Standard |
| Ground Electrode Core Material | Nickel |
| Electrical Terminal Type | Stud |
| Center Electrode Core Material | Copper |
| Center Electrode Tip Material | Nickel |
| Pre-Gap Size | 0.031 |
| Ground Electrode Quantity | 1 |
| Hex Size | 0.819 |
| Insulator Height | 56.00 |
| Manufacturer Heat Range | 8 |
| Seat Type | Flat |
| Reach | 0.75 |
| Thread Diameter | 14.00 |
| Part Number | Bpr8es solid |
| Stock Number | 95521 |
| Product line | Standard Spark Plug |
| Fits | Polaris and Ski-Doo · 138 vehicles |
OE-style service part. Built as a standard spark plug for ignition replacement and routine maintenance.
Copper core design. Copper center electrode construction supports steady heat transfer and combustion.
Pre-gapped specification. Set to 0.031 inch for faster setup during spark plug service.
Cross-references NGK 95521 for the same application. See all 1.
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NGK 95521 Standard Spark Plug
NGK 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.
Compatible 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.
Key Features
- Standard spark plug design for snowmobile ignition service
- Copper core center electrode for consistent heat transfer
- Nickel center and ground electrode materials
- 5000 ohm resistor for electrical noise suppression
- Flat seat, 14 mm thread, and 0.75 inch reach
- Pre-gapped to 0.031 inch
Detailed Description
NGK 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.
This part cross-references NGK (e.g., 95521) for the same application.
What It Is Used For
- Replacing a worn or fouled spark plug
- Restoring reliable ignition in cold-weather operation
- Addressing hard starting or misfire symptoms tied to plug wear
- Maintaining proper combustion in EFI snowmobile engines
- Servicing OE-recommended spark plug applications
Installation Notes and Tips
Verify 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.
Quality Assurance
NGK 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.
This part fits 138 vehicles
Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.
| Year | Make | Model | Liters | Cylinders | Notes |
|---|---|---|---|---|---|
| 2026 | Polaris | 650 INDY Adventure 137 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | 650 INDY SP 137 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | 650 INDY VR1 137 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | 650 INDY VR1 137 Dynamix | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | 650 INDY XC 137 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | 650 INDY XCR 129 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | 650 INDY XCR 137 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | 650 RMK SP 155 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | 650 SwitchBack SP 146 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | 650 SwitchBack XC 146 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | 650 Titan Adventure 155 1.5 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | 650 Titan SP 155 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | 650 Voyageur Adventure Ultimate 155 1.6 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | 650 Voyageur Adventure Ultimate 155 2.0 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | 650 Voyageur SP 146 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | 650 Voyageur SP 155 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | 650 Voyageur XC 155 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | 850 INDY VR1 137 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | 850 INDY VR1 137 Dynamix | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | 850 INDY XC 137 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | 850 PRO-RMK 155 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | 850 PRO-RMK 165 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | 850 RMK KHAOS 146 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | 850 RMK KHAOS 155 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | 850 RMK KHAOS 165 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | 850 RMK SP 155 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | 850 SwitchBack Assault 146 - Escape IFS | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | 850 SwitchBack Assault 146 - Race IFS | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | 850 SwitchBack XC 146 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | 850 Titan Adventure Ultimate 155 1.5 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | 850 Titan Adventure Ultimate 155 1.8 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | Patriot 9R INDY XCR 129 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | Patriot 9R INDY XCR 137 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | Patriot 9R PRO-RMK 155 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | Patriot 9R PRO-RMK 155 Limited Edition 275 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | Patriot 9R PRO-RMK 155 Limited Edition 325 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | Patriot 9R PRO-RMK 165 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | Patriot 9R RMK KHAOS 146 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | Patriot 9R RMK KHAOS 155 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | Patriot 9R RMK KHAOS 155 Limited Edition 275 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | Patriot 9R RMK KHAOS 155 Limited Edition 325 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | Patriot 9R RMK KHAOS 165 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | Patriot 9R SwitchBack Assault 146 - Escape IFS | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | Patriot 9R SwitchBack Assault 146 - Race IFS | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | Patriot Boost INDY VR1 137 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | Patriot Boost INDY VR1 137 Dynamix | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | Patriot Boost PRO-RMK 155 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | Patriot Boost PRO-RMK 155 Limited Edition 275 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | Patriot Boost PRO-RMK 155 Limited Edition 325 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | Patriot Boost PRO-RMK 165 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | Patriot Boost RMK KHAOS 155 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | Patriot Boost RMK KHAOS 155 Limited Edition 275 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | Patriot Boost RMK KHAOS 155 Limited Edition 325 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | Patriot Boost RMK KHAOS 165 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | Patriot Boost SwitchBack Assault 146 - Escape IFS | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2026 | Polaris | Patriot Boost SwitchBack Assault 146 - Race IFS | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | 650 INDY Adventure 137 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | 650 INDY SP 137 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | 650 INDY VR1 137 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | 650 INDY VR1 137 Dynamix | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | 650 INDY XCR 128 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | 650 INDY XCR 136 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | 650 RMK SP 155 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | 650 SwitchBack Assault 146 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | 650 SwitchBack XC 146 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | 650 Titan Adventure 155 1.5 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | 650 Titan Adventure 155 1.8 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | 650 Voyageur 146 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | 850 INDY VR1 137 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | 850 INDY VR1 137 Dynamix | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | 850 INDY XCR 128 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | 850 INDY XCR 136 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | 850 PRO-RMK 155 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | 850 PRO-RMK 165 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | 850 PRO-RMK Slash 155 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | 850 RMK KHAOS 146 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | 850 RMK KHAOS 155 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | 850 RMK KHAOS 165 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | 850 RMK Khaos Slash 155 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | 850 RMK KHAOS Slash 165 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | 850 RMK SP 155 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | 850 SwitchBack Assault 146 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | Patriot 9R INDY XCR 128 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | Patriot 9R INDY XCR 136 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | Patriot 9R PRO-RMK 155 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | Patriot 9R PRO-RMK 165 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | Patriot 9R RMK KHAOS 146 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | Patriot 9R RMK KHAOS 155 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | Patriot 9R RMK KHAOS 165 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | Patriot 9R SwitchBack Assault 146 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | Patriot Boost INDY VR1 137 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | Patriot Boost INDY VR1 137 Dynamix | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | Patriot Boost PRO-RMK 155 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | Patriot Boost PRO-RMK 165 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | Patriot Boost RMK KHAOS 155 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | Patriot Boost RMK KHAOS 165 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | Patriot Boost RMK Khaos Slash 155 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2025 | Polaris | Patriot Boost SwitchBack Assault 146 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2024 | Ski-Doo | Backcountry Sport 600 EFI | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2024 | Ski-Doo | Expedition Sport 600 EFI | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2024 | Ski-Doo | MX Z Neo 600 EFI-40 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2024 | Ski-Doo | MX Z Neo+ 600 EFI-55 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2024 | Ski-Doo | MX Z Sport 600 EFI | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2024 | Ski-Doo | MX Z Sport 600 EFI 137 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2024 | Ski-Doo | Skandic LE 600 EFI | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2024 | Ski-Doo | Skandic Sport 600 EFI | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2024 | Ski-Doo | Summit Neo 600 EFI-40 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2024 | Ski-Doo | Summit Neo+ 600 EFI-55 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2024 | Ski-Doo | Tundra LE 600 EFI | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2024 | Ski-Doo | Tundra Sport 600 EFI | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2023 | Ski-Doo | Backcountry Sport 600 EFI | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2023 | Ski-Doo | Expedition Sport 600 EFI | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2023 | Ski-Doo | MX Z Neo 600 EFI-40 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2023 | Ski-Doo | MX Z Neo+ 600 EFI-55 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2023 | Ski-Doo | MX Z Sport 600 EFI | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2023 | Ski-Doo | Renegade Sport 600 EFI | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2023 | Ski-Doo | Skandic LE 600 EFI | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2023 | Ski-Doo | Skandic Sport 600 EFI | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2023 | Ski-Doo | Summit Neo 600 EFI-40 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2023 | Ski-Doo | Summit Neo+ 600 EFI-55 | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2023 | Ski-Doo | Tundra LT 600 EFI | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2023 | Ski-Doo | Tundra Sport 600 EFI | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| 2022 | Ski-Doo | Backcountry Sport 600 EFI | -L | -- | OEM recommends 0.032 inch gap for spark plug.; Standard Spark Plug |
| 2022 | Ski-Doo | Expedition Sport 600 EFI | -L | -- | OEM recommends 0.032 inch gap for spark plug.; Standard Spark Plug |
| 2022 | Ski-Doo | MX Z Sport 600 EFI | -L | -- | OEM recommends 0.032 inch gap for spark plug.; Standard Spark Plug |
| 2022 | Ski-Doo | Renegade Sport 600 EFI | -L | -- | OEM recommends 0.032 inch gap for spark plug.; Standard Spark Plug |
| 2022 | Ski-Doo | Skandic Sport 600 EFI | -L | -- | OEM recommends 0.032 inch gap for spark plug.; Standard Spark Plug |
| 2022 | Ski-Doo | Skandic WT 600 EFI | -L | -- | OEM recommends 0.032 inch gap for spark plug.; Standard Spark Plug |
| 2022 | Ski-Doo | Tundra LT 600 EFI | -L | -- | OEM recommends 0.032 inch gap for spark plug.; Standard Spark Plug |
| 2022 | Ski-Doo | Tundra Sport 600 EFI | -L | -- | OEM recommends 0.032 inch gap for spark plug.; Standard Spark Plug |
| 2021 | Ski-Doo | Backcountry Sport 600 EFI | -L | -- | OEM recommends 0.032 inch gap for spark plug.; Standard Spark Plug |
| 2021 | Ski-Doo | Expedition Sport 600 EFI | -L | -- | OEM recommends 0.032 inch gap for spark plug.; Standard Spark Plug |
| 2021 | Ski-Doo | MX Z Sport 600 EFI | -L | -- | OEM recommends 0.032 inch gap for spark plug.; Standard Spark Plug |
| 2021 | Ski-Doo | Renegade Sport 600 EFI | -L | -- | OEM recommends 0.032 inch gap for spark plug.; Standard Spark Plug |
| 2021 | Ski-Doo | Skandic Sport 600 EFI | -L | -- | OEM recommends 0.032 inch gap for spark plug.; Standard Spark Plug |
| 2021 | Ski-Doo | Skandic WT 600 EFI | -L | -- | OEM recommends 0.032 inch gap for spark plug.; Standard Spark Plug |
| 2021 | Ski-Doo | Tundra LT 600 EFI | -L | -- | OEM recommends 0.032 inch gap for spark plug.; Standard Spark Plug |
| 2021 | Ski-Doo | Tundra Sport 600 EFI | -L | -- | Actual OE Manufacturer; Standard Spark Plug |
| No rows match your filter. | |||||
Directly replaces or cross-references 1 part number
Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.
NGK — 95521