DC6-4
DC64
DC6-4 TWIN FIRE
DUAL OUTPUT IGNITION COIL
Description
The ARKAUTO Twin Fire contains two separate dual-output ignition coils in one package. This coil can be used for dual plug Harley-Davidson applications as well as four-cylinder wasted spark applications.
The Twin Fire utilizes the stock Harley coil mounting bracket and will fit most models without modification. Stock covers will require modification to reinstall.
Warning: Harley applications require a single fire ignition. The stock Harley dual fire ignition or other dual fire ignitions may not be used with this coil.
Warning: The Twin Fire coil must be used with a dwell controlled electronic ignition such as the Dyna 2000 ignition system. DO NOT use this coil with a non-dwell controlled ignition such as a Dyna-S ignition or points, as damage to the coil and the ignition system will result.
Warning: Never fire an ignition coil without the spark plug wires attached. To observe a spark from a coil, plug a spark plug into a spark plug wire on the coil and lay the plug against the engine case while turning the engine over. All spark plug towers on the coil should always be connected to a spark plug before firing the ignition.
Installation
If the stock ignition is still installed, your coil wiring will match either figure 3, figure 4, or figure 5.
Stock wiring - figure 3
Remove one pink wire and try to start the bike. If the bike runs and the tach stops working, label this as the tach wire. Now disconnect the remaining wires and remove the coil. Mount the Twin Fire in the stock coil location. Install a single fire ignition with the instructions included with the ignition. Typical connection will look like Figure 1.
Note: It is strongly recommended that the wires from the coil connector be soldered to the harness. Butt connectors, wire nuts, etc, may not provide a reliable long term connection.
Stock wiring - figure 4
Remove the coil and install the Twin Fire in the stock coil location. Install a single fire ignition with the instructions included with the ignition. Typical connection will look like Figure 1. If bike has a tach, refer to the Tach Connection section.
Stock wiring - figure 5
Disconnect the wires and remove the coil. Mount the Twin Fire in the stock coil location. Install a single fire ignition with the instructions included with the ignition. Typical connection will look like Figure 1. You will have one unused white wire extending from the Twin Fire coil harness pigtail that should be taped up. If bike has a tach, refer to the Tach Connection section.
Tach Connection
Some tachometers are connected inside the wiring harness at an inaccessible location. If the bike does not have an accessible tach wire, then you will need to do the following to reconnect the tach.
Access the back of the tachometer and remove the pink wire from the back of the tach. Attach a new wire where the pink wire was originally connected. Route this wire to the tach output provided by the ignition system.
Spark plug gaps
For dual plug applications, gaps should be set at .025" to .028".
Specifications (each coil)
•Primary resistance: 3.0 ohms
•Secondary resistance: 13.5K ohms
•Weight: 1.68 lbs
•Bolt Centers: 2.0”
•Overall dimensions: 3.7W x 3.3H x 3.2D
•Secondary available voltage: 32Kv
