Reliable spark plug designed for improved performance, fuel economy and durability.
Designed to enhance combustion and engine response, the S-Plug delivers reliable performance across a wide range of applications. A global leader in spark plug technology helps drive improved performance in every type of engine.
Its broad range of plug designs supports better fuel economy, long-lasting durability, and dependable operation under varied conditions. Ideal for routine replacement and performance upgrades. 🔥⚙️
This product fits the following vehicles. Use the filters below to narrow down the list if needed.
| Manufacturer | Model | Family | Year | Notes |
|---|---|---|---|---|
| Harley Davidson | Big Twin | 1936 | ||
| Harley Davidson | Big Twin | 1937 | ||
| Harley Davidson | Big Twin | 1938 | ||
| Harley Davidson | Big Twin | 1936 | ||
| Harley Davidson | Big Twin | 1937 | ||
| Harley Davidson | Big Twin | 1938 | ||
| Harley Davidson | Big Twin | 1939 | ||
| Harley Davidson | Big Twin | 1940 | ||
| Harley Davidson | Big Twin | 1937 | ||
| Harley Davidson | Big Twin | 1938 | ||
| Harley Davidson | Big Twin | 1939 | ||
| Harley Davidson | Big Twin | 1940 | ||
| Harley Davidson | Big Twin | 1941 | ||
| Harley Davidson | Big Twin | 1942 | ||
| Harley Davidson | Big Twin | 1943 | ||
| Harley Davidson | Big Twin | 1944 | ||
| Harley Davidson | Big Twin | 1945 | ||
| Harley Davidson | Big Twin | 1946 | ||
| Harley Davidson | Big Twin | 1947 | ||
| Harley Davidson | Big Twin | 1938 | ||
| Harley Davidson | Big Twin | 1939 | ||
| Harley Davidson | Big Twin | 1940 | ||
| Harley Davidson | Big Twin | 1941 |
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