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Champion 538 Spark Plug
| Brand | Champion 538 |
|---|---|
| Center Electrode Diameter (Inch) | 0.1 |
| Center Electrode Tip Material | Nickel |
| Classification | Champion Copper Plus Small Engine |
| Electrical Terminal Type | Removable Nut |
| Ground Electrode Core Material | Nickel |
| Ground Electrode Material | Nickel Copper Alloy |
| Ground Electrode Quantity | 1 |
| Hex Size | 0.813 |
| Hex Size | 20.650 |
| Hex Type | Hex |
| Installed Height (Inch) | 2.24 |
| Manufacturer Heat Range | 8 |
| Plug Type | RH8C |
| Pre-Gap Size | 0.025 |
| Pre-Gap Size | 0.64 |
| Reach | 0.438 |
| Resistor Type | Yes |
| Seat Type | Flat |
| Taper Diameter (Inch) | 0.31 |
| Thread Diameter | 0.551 |
| Thread Diameter | 14.000 |
| Product line | Copper Plus |
| Fits | Harley Davidson, Panhard, and Hudson |
Copper core electrode. Improves conductivity and heat control for dependable performance.
Nickel center electrode. Supports consistent ignition and good overall wear.
Resistor design. Helps reduce electrical noise for smoother operation.
Cross-references RH8, RH8C and XH8 for the same application. See all 5.
Champion Copper Plus Spark Plug 538
Champion Copper Plus 538 is a replacement spark plug built for dependable ignition performance in small engine and automotive secondary ignition applications. It uses a copper core electrode for improved conductivity and heat control, with nickel-based electrode materials for steady wear characteristics.
Key Features
- Copper core electrode for strong conductivity and heat management
- Nickel center electrode tip and nickel ground electrode core material
- Pre-gapped at 0.025 in. / 0.64 mm
- Resistor type spark plug with removable nut terminal
- Flat seat design, 14 mm thread diameter, 0.438 in. reach
- Champion Copper Plus Small Engine classification
Product Details
The Champion Copper Plus line focuses on practical ignition performance with a copper core that helps transfer heat efficiently while maintaining consistent spark delivery. Part number 538 is identified as plug type RH8C and cross-references Champion RH8 and XH8-series applications, including RH8, RH8C, XH8, XH8J, and XH9. For buyers searching Champion 538 spark plug, RH8C replacement, or a Copper Plus ignition service part for small engine and select automotive use, this plug provides the core specifications needed for a direct-match search.
Use this spark plug when servicing ignition systems that call for a flat-seat, resistor-style plug with a 20.650 mm hex size and 2.24 in. installed height. It is a practical choice for routine tune-up work where stable conductivity, heat control, and standard nickel electrode construction matter. Search terms such as Champion 538 spark plug for small engine, RH8C spark plug replacement, and Champion Copper Plus 538 fit naturally with this part.
What It Helps Address
- Hard starting caused by worn or fouled spark plugs
- Misfire conditions from weak or inconsistent spark output
- Rough idle related to ignition wear
- Reduced throttle response from degraded plug performance
- Heat-related plug wear in service intervals
Installation Notes
Verify the plug type, thread diameter, reach, seat type, and heat range against the engine specification before installation. Check the pre-gap against the application requirement and adjust only if the engine manufacturer allows it. Clean the plug seat area, thread the plug by hand to avoid cross-threading, and tighten to the engine maker’s torque specification. For fitment-based searches, confirm the exact application before ordering Champion 538 or RH8C.
Quality Assurance
Champion is a long-established ignition brand, and the Copper Plus line is built around a copper core electrode for conductivity and heat control. This part is engineered to meet the listed specifications for consistent service in the applications that call for Champion 538.
| Year | Make | Model | Position | Notes |
|---|---|---|---|---|
| No rows match your filter. | ||||