AUTOLITE - 4123 - Spark Plug - #4123
The AUTOLITE 4123 is a copper-core spark plug with a tapered nickel/chrome alloy tip designed for a sharper, leaner spark, fitting 1979-1985 Harley-Davidson street bikes (including the Roadster, XLX 1000, and XLH1000) and made in the USA.
Features
- Designed for a sharper, leaner spark with tapered nickel/chrome alloy tip and copper center electrode
- Made in the USA
Specs
- Riding Style: Street
- Heat Range: 3
- Model: BPR5HS
- Style: Copper
- Ground Electrode Shape: Standard
- Product Name: Spark Plug
- Center Electrode Projection: Projected
- Center Electrode Type: Necked Down
- Electrode Tip Material: Nickel Alloy
- Terminal Configuration: Threaded Stud
- Units: Each
- Ground Electrode Configuration: Single
- Type: Resistor
Frequently Asked Questions - AUTOLITE - 4123 - Spark Plug - #4123 - '79-'85 Harley-Davidson
How do I know if this part fits my vehicle?
Check the fitment information listed on this page against your exact year, make, model, and (where applicable) trim, engine size, or configuration. If your exact vehicle isn't listed, or you're not sure, use the product chat on this page or contact our support team before ordering - we're glad to help confirm fitment.
What does it mean if a product is listed as universal fit?
Universal fit means the product is designed to work across a range of vehicles, not that it's guaranteed to fit every one. Compare the listed measurements, mounting requirements, and connector or hardware specs against your specific vehicle before ordering, since some installations may need additional hardware or minor fabrication.
Where can I find installation instructions for this product?
General installation notes are provided above where available. For detailed step-by-step instructions, refer to the manufacturer's documentation included with the product, or use the product chat on this page for questions about difficulty, required tools, or whether professional installation is recommended.
What if I have more questions about this product?
Use the product chat on this page for fitment, specs, installation, and compatibility questions, or contact our support team directly for help before you order.
