SKU:49-0880
AuthenticDoering spark plug set designed for early Harley-Davidson air‑cooled engines, featuring a 7/8 inch thread for classic models in need of period‑correct ignition components.
Fitment and usage: suitable for Harley models using 7/8 inch plugs, specifically Harley Davidson F, J, RL, UL, and VL series across the listed years; 7/8 inch plugs are intended for 1923 and earlier models, while 18mm plugs are recommended for 1924–1947 models.
In addition to restoration, this set supports ongoing maintenance for vintage Harleys, offering a reliable ignition solution that preserves the classic running characteristics your bike reflects.
Replica air cooled spark plug with 7/8 inch thread for early model motors and includes sealing washers brass terminal and brass removable terminal nuts. Fits all 7/8 inch applications.This V-Twin 7/8 inch Doering Spark Plug Set is designed to provide authentic performance for vintage Harley Davidson motorcycles. Featuring the original 1930s globe design, these spark plugs include a top ventilated brass collar for improved cooling, adhering to the classic Doering design that ensures reliable ignition and engine efficiency. The terminal nut is removable, allowing for easier installation and maintenance, making this set ideal for restoring or maintaining early Harley Davidson F and VL series models. Crafted to match original standards, these plugs are perfect for enthusiasts seeking authenticity and durability in their restoration projects.
The spark plugs feature a #3 heat range, suitable for air-cooled engines, and are packaged in a gift box for presentation or storage. Please note that 7/8 inch spark plugs fit Harley Davidson models from 1923 and earlier, while 18mm plugs are recommended for models from 1924 to 1947. The nickel-plated base with cooling holes reflects the original design, ensuring optimal air flow and heat dissipation. These plugs are manufactured in Taiwan, maintaining high quality standards, although the historic Brooklyn-based Doering company no longer produces in the USA.
Designed with a full seize hex for easy installation and removal, the plugs are compatible with single and twin flat head engines, with some considerations for space on IOE types due to the large hex size. This set is sold as a pair, making it a reliable choice for comprehensive engine maintenance or restoration. Compatible with OEM cross-references such as 36-11, and complemented by accessory items like the 18mm Doering Spark Plug Set and specialized tools, this set ensures you have everything needed for vintage Harley Davidson spark plug maintenance.
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