The Harley-Davidson part number 56410-53 refers to an OEM Control Coil End Plug.

While modern riders associate the word "coil" strictly with the engine's electrical ignition coil, in vintage Harley-Davidson terminology, a "control coil" refers to the coiled outer metal sheath of the internal handlebar throttle and spark advance cables. This plug is a critical mechanical piece of that handlebar linkage.

🔧 Part Function & Application

Component Type: Internally threaded handlebar control cable end plug (0.188" cable capability).

Primary Use: Threads into the handlebar control mechanism to anchor the inner throttle or advance wire casing. It keeps the external "control coil" sheath locked in place so the internal wire can pull smoothly against it without binding or slipping out of position.

Fitment Era: Introduced for the 1953/1954 model year, this vintage hardware piece natively fits Panhead, Shovelhead, and early Sportster families utilizing internal handlebar wiring configurations:

1954–1974 Big Twins (FL, FLH, Duo-Glide, Electra Glide configurations)

1954–1973 K, KH, and XL Models (Early Ironhead Sportsters)

1958–1973 Servi-Car models (equipped with rubber-mounted handlebars)

The Harley-Davidson 56410–53 Coil Plug is a high-quality ignition component designed specifically for motorcycles and scooters. With the signature Harley-Davidson brand and manufacturer part number, this coil plug ensures reliable and efficient ignition performance. Designed by the trusted brand Harley-Davidson, this product guarantees durability and compatibility with their vehicles, making it a valuable accessory for motorcycle enthusiasts looking to enhance their electrical and ignition systems.