Champion 538 spark plug for the 1958-1971 Harley-Davidson Xlch and other vehicles creates the spark that ignites the air-fuel mixture in the cylinder.
- Part of the Champion Copper Plus Small Engine line
- Copper core center electrode for accurate heat range control, longer life and dependable performance
- Coated shell that resists corrosion in harsh environments
- Built-in resistor that minimizes electrical interference to protect sensitive electronics
- Pre-gapped at 0.025 in (0.64 mm) to simplify installation
- Engineered for reliable ignition in all weather conditions
Quick facts
- Part: Champion 538 spark plug
- Fits: the 1958-1971 Harley-Davidson Xlch and other vehicles
- Material: Copper center electrode tip
- Condition: New
A worn or fouled plug can show up as hard starting, a rough idle or a misfire. A weak coil, tired ignition wiring or a fuel delivery problem can be behind those signs too, so find the cause before you buy plugs.
Fits
The vehicles it fits include the 1958-1971 Harley-Davidson Xlch, the 1958-1970 Harley-Davidson XLH900 and the 1958-1964 Harley-Davidson Xlrtt, along with other Harley-Davidson, Hudson and Panhard models. It is built to meet OE fit, form and function. If your vehicle is not named here, look up its year and model in the "Vehicles it fits" section.
Specifications
Fit and size
- Plug type: RH8C
- Thread diameter: 14 mm (0.551 in)
- Pre-gap: 0.025 in (0.64 mm)
- Seat type: Flat
Build and materials
- Grade: Standard replacement
- Resistor: Yes
- Center electrode tip material: Copper
- Washer: Crush washer included
- Condition: New
- Country of origin: Mexico
In the box
One spark plug with its crush washer. The 1958-1971 Harley-Davidson Xlch takes two, so order two and fit them together; the quantity varies by vehicle.
Interchange: RH8 · RH8C · XH8 · XH8J · XH9
Product information is for general reference and may contain errors. See our Disclaimer.
This part cross-references / interchanges with the following part numbers:
RH8, RH8C, XH8, XH8J, XH9
Frequently Asked Questions
Is the Champion 538 spark plug right for the 1958-1971 Harley-Davidson Xlch?
Yes. Champion 538 fits the 1958-1971 Harley-Davidson Xlch, and the 1958-1970 Harley-Davidson XLH900 takes it as well. Look up other years and models in the "Vehicles it fits" section.
Does this Copper Plus spark plug come with a washer?
Yes. This listing is one spark plug with its crush washer included.
Do I need to set the gap on the Champion 538 before installing it?
No. Champion 538 comes pre-gapped at 0.025 in (0.64 mm), a design that simplifies installation.
How can I tell if a Copper Plus plug is fouled or worn out?
Hard starting, a rough idle or misfires can be signs. With the engine off and cool, look for a worn electrode, a cracked insulator or heavy deposits once the plug is out.
Does the Champion 538 replace an XH8 plug?
Yes. Champion 538, plug type RH8C, is listed as a replacement for RH8, XH8, XH8J and XH9.
