OFFRAMP OMYY Magneto Ignition for Harley Big Twin Knucklehead, Panhead & Generator Shovelhead (1936–1969)

Built for classic Harley-Davidson Big Twins and traditional custom machines, the OFFRAMP OMYY Magneto Ignition delivers a true self-contained ignition solution for compatible 1936–1969 Knucklehead, Panhead, and early Shovelhead engines. Mechanically driven by the engine, the magneto generates the energy required for ignition without depending on battery power for spark, making it a natural choice for vintage restorations, period-inspired race builds, choppers, and stripped-down customs where mechanical simplicity matters.

The OMYY combines automatic ignition advance with manual retard for starting, helping reduce kickback while maintaining proper timing once the engine is running. Its separate magneto head and drive assembly allows greater installation flexibility, while the adjustable-height design helps accommodate tight cylinder-head and pushrod-cover clearances. Depending on the application, the magneto can be installed in the conventional position or configured in an out-to-side orientation, particularly useful on certain Knucklehead builds. Precision-machined billet aluminum construction and a polished mechanical finish complete a purpose-built ignition system that stays true to traditional magneto architecture while bringing modern machining quality to a classic Harley platform.

Product Features

• Self-Contained Magneto Ignition – Generates the energy required for spark independently of battery power, ideal for simplified electrical systems and traditional custom builds.
• Automatic Advance / Manual Retard – Manually retard ignition timing for easier starting and reduced kickback, with automatic timing advance during normal engine operation.
• Adjustable-Height Design – Allows the magneto assembly to be positioned for improved clearance around cylinder-head fins, pushrod covers, and surrounding engine components.
• Separate Head & Drive Architecture – The magneto head and drive assembly are designed as separate sections, providing greater flexibility during installation and service.
• Standard or Out-to-Side Mounting – Supports conventional mounting as well as an optional side-mounted orientation for compatible applications, particularly useful on certain Knucklehead builds.
• Battery or Battery-Free Compatible – Can be incorporated into motorcycles running a conventional battery system or into stripped-down builds where the ignition operates independently of the battery.
• Precision-Machined Billet Aluminum Construction – CNC-machined aluminum components provide accurate fit, structural rigidity, and a premium purpose-built mechanical appearance.
• Polished Mechanical Finish – The highly polished billet body complements vintage race, chopper, bobber, and period-correct engine builds.
• Built for Classic Harley Big Twins – Designed around compatible 1936–1969 Harley-Davidson Knucklehead, Panhead, and early Shovelhead engine applications.