S&S Cycle IST Ignition System for S&S V-Series Engines with Flywheel Machined for Crank Trigger - Manual (Page 3)

Single Fire Coil
In addition to the spark plug terminals, an aftermarket single fire coil will have three wiring terminals: A negative terminal for the front cylinder, a
common 12v + terminal, and negative terminal for the rear cylinder, this is the most common type of single fire coil.
All single fire coils are compatible with the S&S ignition if they have a resistance of 0.5 to 3 ohms. The standard rating for an aftermarket single fire
coil is 3 ohms. Coils with higher resistance will decrease ignition output.
The S&S Ignition system will also support a variety of different ignition coil combinations as long as they are connected for single fire operation, and
yield a final resistance of 0.5 to 3 ohms. The ignition is also compatible dual plug heads with the correct coil configuration.
Examples of custom coil/spark plug combinations supported by the S&S ignition:
• One coil single fire for single plug heads.
• One coil single fire for dual plug heads.
• Two coil single fire for single plug heads.
• Two coil single fire for dual plug heads.
Spark Plugs and Plug Wires
Spark plugs must be resistor spark plugs (suppression type) of the correct style and heat range for the application. Do not use non-resistor plugs.
Spark plug wires must be suppression type. Do not use solid metal core plug wires.
KIT CONTENTS
• Sensor kit
• IST module
IST ignition sensors are pre installed on S&S® assembled V-Series engines with toothed flywheels.
NOTE: Sensor installation instructions in the following section are included here for future reference, should a sensor need replacing.
The IST module is packaged separately (See Picture 2, below right) and connected to the system via the wiring Harness Adapter. See Picture 1,
below left.
• Wiring Harness Adapter (S&S 55-1089), Item a.
• Cylinder Head Temperature Sensor (S&S 55-1039), Item b.
• Crank Position Sensor (S&S 55-1051, H-D® #32798-00) and Hardware, Item c.
• MAP Sensor (S&S 55-1037, H-D® #32316-99) and Hardware, Item d.
• Coil Harness (S&S 55-1038), Item e.
• Loctite® and Wire Ties, Item f.
• Knock Sensor Kit (Includes: Knock Sensor, Knock Sensor Mount and Related Hardware S&S 55-1015), Items g-n.
All reference to Harley-Davidson® part numbers is for identification purposes only. We in no way are implying that any of S&S® Cycle’s products are original
equipment parts or that they are equivalent to the corresponding Harley-Davidson® part number shown.
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Picture 2
S&S Intelligent Spark Technology ECU Module
Picture 1
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