CHAMPION - 538 - Spark Plug - RH8C
The CHAMPION 538 Spark Plug (Model RH8C) is a copper-core plug for 1957-1978 Harley-Davidson Sportster models (including the 900 XLH, Cafe Racer, and XLH1000), featuring a patented SAC-9 semi-conductor resistor for EMI/RFI suppression and an Ultraseal™ coated shell for rust prevention — made in the USA.
Features
- Features a copper core center electrode that allows for accurate control of heat range, optimizing performance and longevity of the spark plug
- Patented SAC-9 semi-conductor resistor for maximum EMI and RFI suppression
- Patented Ultraseal™ coated shell for rust prevention
- Made in the USA
Specs
- Hex Size: 17.5 mm
- Riding Style: Street
- Units: Each
- Model: RH8C
- Ground Electrode Shape: Standard
- Thread Reach: 11.1 mm
- Center Electrode Type: Standard
- Electrode Tip Material: Nickel Alloy
- Ground Electrode Configuration: Single
- Style: Copper Plus
- Type: Resistor
- Heat Range: 8
- Product Name: Spark Plug
- Center Electrode Projection: Non-Projected
- Terminal Configuration: Removable Nut
Frequently Asked Questions - CHAMPION - 538 - Spark Plug - RH8C - '57-'78 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.
