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Stock replacement for Mallory 508732 (Big Twin) and 508733 (Sportster) billet distributors. Requires a voltage between 7-16 volts.

Mallory, 'Unilite' replacement ignition module, 12V

#508739

Stock:Yes

Dual fire ignition module for mechanical advance. This module is optically triggered by an infrared light and a photocoupler. Therefore this system will provide a 100% stable ignition timing, at any RPM. The Mallory's E-Spark can be used to drive any ignition coil (Accel coils recommended), or combination of coils with a total primary resistance of at least 2.0 Ohm. Coil recommendation: 2.0-3.0 Ohm for race applications and 3.0-4.0 for street/highway use.

Note 1: A mechanical advance unit must be re-used or purchased separately.
Note 2: With Mallory modules it is recommended to use Accel ignition coils.
Note: The difference between single dual fire explained:
- Dual fire -
This is the way the earlier, pre-Twin Cam, engines work. A single coil is used and both spark plugs fire simultaneously. This is the simplest system. The 'wasted' spark is sometimes said to be horsepower robbing.
- Single Fire -
This is the way the stock 00-up Twin Cam engines work. Two separate coils will fire the spark plugs independently and only the spark plug of the cylinder that is on compression stroke will be fired. It is said that these engines vibrate less and can improve power. The effects will become more pronounced with hotter cams and higher RPM.

Mallory, 'E-Spark' ignition module. Dual fire

#508731

Stock:No

12V. Dual fire. With a bullet proof, fully adjustable automotive mechanical advance unit with 14 different advance curve settings. Comes with a Mallory 'Unilite®' electronic ignition module. Complete with instructions and wiring harness.

Note: To be used with carbon core spark plug wires. Do not use copper core.
Note: To be used with coil(s) with a total primary resistance of around 3-4 Ohm for dual fire for street use, 4-5 Ohm may be used but can reduce performance. For race use 2-3 is recommended.
Note: Flathead & Sportster models require an OEM style 32585-36 distributor retainer, which is not available through Motorcycle Storehouse.
Note: All 6 volt models will require a conversion to a 12 volt electrical system.
Note: See 508739 for the replacement Unilite® module only.

Mallory, 12V billet distributor for Flathead/Sportster

#508733

Stock:No