







⚡ Ignite your drive with Autolite’s copper-powered spark plugs – performance you can feel!
Autolite 25 Copper Resistor Spark Plugs feature a full copper core electrode for superior thermal conductivity, a leak-proof copper-glass seal for durability, and an integrated resistor to minimize radio frequency interference and electrode wear. Designed for quick starts, enhanced fuel efficiency, and smooth acceleration, these plugs combine precision engineering with a trusted legacy since 1936, making them the go-to choice for reliable automotive ignition performance.





| Brand | Autolite Iridium Ultra |
| Core Material | Copper |
| Thread Size | RM |
| Top Material Type | Alloy Steel |
| Vehicle Service Type | Motorcycle |
| Global Trade Identification Number | 00009100003690 |
| Automotive Fit Type | Vehicle Specific Fit |
| UPC | 009100003690 |
| Manufacturer | FRAM |
| Model | 25-4PK |
| Item Weight | 1.76 ounces |
| Product Dimensions | 1 x 3.88 x 3.38 inches |
| Item model number | 25-4PK |
| Is Discontinued By Manufacturer | Yes |
| Exterior | Chrome |
| Manufacturer Part Number | 25-4PK |
| Position | Front, Rear |
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