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⚡ Ignite your drive with NGK Iridium IX – where precision meets power!
The NGK 6441 ZFR6FIX-11 Iridium IX Spark Plug 4-pack is engineered for performance enthusiasts seeking superior ignitability, throttle response, and durability. Featuring a 0.6mm laser-welded iridium tip and triple gasket seal, these spark plugs resist fouling and combustion gas leaks, ensuring consistent, efficient engine performance. Trusted globally as an OEM standard, NGK’s iridium alloy spark plugs deliver long-lasting reliability for motorcycles and high-performance engines.










| ASIN | B00CC0E6GA |
| Automotive Fit Type | Vehicle Specific Fit |
| Best Sellers Rank | #76,864 in Automotive ( See Top 100 in Automotive ) #510 in Automotive Replacement Spark Plugs |
| Brand Name | NGK |
| Compatible with Vehicle Type | Motorcycle |
| Core Material | Iridium |
| Customer Reviews | 4.8 4.8 out of 5 stars (884) |
| Global Trade Identification Number | 00087295064412 |
| Included Components | 6441 |
| Item Weight | 0.01 Ounces |
| Manufacturer | NGK |
| Manufacturer Part Number | 6441-4PK |
| Manufacturer Warranty Description | Includes manufacturer provided warranty |
| Model Number | 6441-4PK |
| OEM Equivalent Part Number | 6441-4PK |
| Thread Size | 14mm x 19mm |
| Top Material Type | Metal |
| UPC | 087295064412 |
| Unit Count | 1.0 Count |
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