Daytona Twin Tec Ignition Coil

Daytona Twin Tec Ignition Coils: High-Output Spark for Harley-Davidson Engines

When it comes to extracting reliable, high-output ignition energy from a Harley-Davidson engine, few names carry more credibility than Daytona Twin Tec. As a specialist in electronic fuel injection and ignition systems for H-D motorcycles, the brand has built its reputation on engineering precision components that meet or exceed factory specifications — and their ignition coils are a prime example of that philosophy in action.

Engineered Specifically for Harley Platforms

Daytona Twin Tec ignition coils are not generic off-the-shelf components. They are purpose-built for specific Harley-Davidson engine families, ensuring a correct fit and optimized electrical performance for each application. The lineup addresses two core H-D platforms:

• Twin Cam (1999–2017): The high-output coil (P/N 2008) is a single-fire design compatible with all carbureted Twin Cam HD engines and serves as a direct replacement for OE H-D P/N 31655-99. It is also fully compatible with the Daytona Twin Tec TC88 and TC88A ignition systems, and can be used with any system that supports a 1/2 ohm coil resistance. A separate variant (P/N 2009) is offered for 2001–2006 Twin Cam models equipped with Delphi EFI, replacing OE H-D P/N 31743-01.
• Milwaukee-Eight M8 (2017–2024): The M8 Ultra high-output coil (P/N 2017M8) is a two-cylinder coil with four terminals, designed specifically for the OE M8 Ultra dual-plug heads. It fits the 2017–2024 Ultra/Bagger platform and is compatible with both the Daytona Twin Tec M8FI ECU and the stock H-D ECU.

Performance That Goes Beyond Stock

What sets Daytona Twin Tec coils apart from OEM replacements is the emphasis on high-output spark delivery. Their Twin Cam coils are rated at greater than 50 mJ of spark energy and over 40,000 volts of output — figures designed for demanding, high-performance applications where a weak spark translates directly to lost power and rough running. For riders who have already upgraded their ignition system or who run hotter cams and bigger displacement, a matched high-output coil is an essential part of the equation.

The brand also offers a Single-Fire Mini Ignition Coil Kit aimed at custom motorcycle builders where space is at a premium. Featuring a compact 2.4” x 2.3” x 1.6” form factor and a 3-ohm primary compatible with Twin Tec ignitions and most modern aftermarket single-fire systems, the kit includes two coils, a universal spark plug wire set, 90° and 135° spark plug boots, and all required electrical terminals — everything needed for a clean, professional installation on a custom build.

Designed and Manufactured in the USA

Daytona Twin Tec is part of the JMS Daytona Group, which designs and manufactures its products domestically in an ISO 9000-certified facility. With over three decades of experience developing advanced electronics for OEM and aftermarket customers, the engineering behind each coil reflects that deep institutional knowledge. Every coil is built to integrate seamlessly into the broader Daytona Twin Tec ecosystem of ignition systems, ECUs, and tuning tools.

Whether you are a daily rider looking for a reliable direct-replacement upgrade or a performance builder spec’ing out a custom Twin Cam or M8 project, Daytona Twin Tec ignition coils deliver the spark quality that serious Harley enthusiasts demand. Explore the full Daytona Twin Tec brand catalog or browse all ignition coils to find the right match for your application.