S&S Cycle IST Ignition System for 1984–99 4 1/8 Bore Big Twin Engines - Manual (Page 4)

S&S® Ignition System Installation Kit 55-1050 contains the following items (See Picture 1, previous page):
• S&S 41⁄8" Bore Engine Wiring Harness Adapter (S&S 55-1048) Item (a)
• Cylinder Head Temperature Sensor (S&S 55-1014, Harley-Davidson® #32446-99) 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)
C. Removal of Existing Ignition Components
Prior to installation, disconnect and remove the battery, negative cable first. This will eliminate potential sparks and inadvertent
engagement of the starter while working on the motorcycle.
Be careful not to damage the front of the tank when raising or removing it.
Although it may not be necessary in some cases, removal of the gas tank is recommended for removal of stock components, installation of the
IST system components, and to allow routing of the wiring harness. An alternative to complete tank removal: Loosen (do not remove) the bolt
at the front of the tank and remove the mounting bolt(s) at the rear of the tank. The rear of the tank may then be raised slightly to allow room
for these tasks.
NOTE: Clearances are limited at the front of the tank. Use care not to damage any painted surfaces while handling tank.
Removal and installation of components without removing the fuel tank is a timesaving suggestion only. If there is any reservation on the
part of the installing mechanic about performing these tasks with the fuel tank in place, refer to the appropriate service manual for correct
procedure for removing fuel tank and related components.
1. Ignition Module
a. Locate the ignition module installed on your motorcycle. The ignition module can usually be found under the seat, a side cover, or in front
of the engine on the frame. See Picture 3, below left. Refer to the service manual for your motorcycle if you have trouble locating it.
b. Remove the module mounting hardware and unplug the module. See Picture 4, below right. The plug is disconnected by simultaneously
pressing the locking tabs on the connector and pulling it away from the module. Save the mounting hardware for installation of the S&S®
ignition module.
4
Picture 3 Picture 4
CAUTION
WARNING