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Autolite XST255DP Spark Plug
| Brand | Autolite XST255DP |
|---|---|
| Resistance | 1 |
| Ground Electrode Tip Design | Tapered |
| Ground Electrode Core Material | Nickel |
| Electrical Terminal Type | Stud |
| Center Electrode Core Material | Copper |
| Center Electrode Tip Material | Iridium |
| Pre-Gap Size | 0.030 |
| Pre-Gap Size | 0.80 |
| Ground Electrode Quantity | 1 |
| Hex Size | 19 |
| Hex Size | 3/4" |
| Seat Type | Flat |
| Reach | 0.374 |
| Reach | 9.5 |
| Thread Diameter | 14.0 |
| Resistor Type | No |
| Center Electrode Design | Fine wire |
| Ground Electrode Tip Material | Platinum |
| Insulator Material | Ceramic |
| Insulator Type | Short projection |
| Fits | — |
Iridium fine-wire tip. Supports durable spark delivery and sustained performance.
OE-style replacement. Built with form, fit, and function alignment for service use.
Autolite ignition expertise. Backed by a leading spark plug supplier in the aftermarket.
Cross-references NGK 1589, 843EZ and 457704 for the same application. See all 13.
Will it fit your vehicle?
Free return shipping if it doesn't fit.
Overview
Autolite Xtreme Start Spark Plug Display Pack XST255DP is a premium spark plug built for quick starts and steady ignition performance in outdoor equipment. It uses an iridium enhanced platinum fine-wire tip for long service life and consistent operation.
Key Features
- Iridium enhanced platinum fine-wire tip for durable spark delivery
- Copper core center electrode for efficient heat transfer
- Tapered ground electrode with nickel core and platinum tip
- 0.030 in. pre-gap for straightforward setup
- Flat seat, 14 mm thread, 19 mm hex, and stud terminal
- Short projection ceramic insulator for compact plug design
Product Details
The Autolite Xtreme Start Spark Plug Display Pack XST255DP is engineered as an OE-form, fit, and function replacement style spark plug for a wide range of small-engine applications. Its fine-wire center electrode, iridium tip, and platinum ground electrode are selected to support reliable ignition and sustained performance. Autolite is a long-standing supplier of spark plugs to the automotive aftermarket and OEM channels, and this part reflects that ignition-focused product line. This part cross-references NGK 1589 for the same application.
Common Uses
- Hard starting caused by worn or fouled spark plugs
- Weak ignition output from aged plug electrodes
- Misfire or uneven engine operation under load
- Reduced starting consistency in outdoor power equipment
Installation Notes
Verify thread diameter, reach, seat type, and terminal style before installation. Set the gap to the specified 0.030 in. if adjustment is required, and inspect the ignition system for wear or contamination before installing the new plug. Use the part number XST255DP to confirm the correct replacement before service.
Quality Assurance
Autolite positions this spark plug as an OE-style replacement with form, fit, and function alignment for broad application coverage. The XST255DP part number is also useful when matching service parts against interchange references during ignition system maintenance.
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| No rows match your filter. | |||