S&S Cycle EFI Wire Harness for Custom Frame Applications Using S&S Fuel Injected Engines and Delphi Style Modules User Manual

Page 6

CAUTION

WARNING

C. OXYGEN SENSOR INSTALLATION

Some machining and welding is required for this installation. If you are not comfortable with either procedure, please take your
motorcycle to an S&S® certified facility for the work.

Do not connect the battery until told to do so in these instructions. Failure to do so may result in damage to your wire harness and other
motorcycle electronics which can result in costly repair and service fees. Leaving the battery disconnected during the entirety of this
installation prevents accidental starting of the motorcycle which could cause injury to you or others around you.

Gasoline is extremely flammable! Be sure to keep all open flames and sparks away from it. Always work on your motorcycle in a well
ventilated area.

S&S fuel injection is not compatible with E85 fuel. Use of E85 fuel may cause your engine to run poorly and/or damage to system
components.

1- This system requires the motorcycle to be equipped with either the S&S USB Delphi® style VFI Module PN 55-5090 for 2001 Harley-Davidson®

Softail® models and all 2002-’07 models or Harley-Davidson equivalent module.

NOTE: S&S PN 55-5090 comes with an ECM that is not calibrated but a calibration CD is supplied. S&S recommends that all calibrations be performed by
an S&S certified dealer.
2- You will need to install an oxygen sensor in each head pipe of the motorcycle exhaust system. S&S oxygen sensor service kit S&S PN106-2061

and PN 55-1593 are ideal for this case. To determine the best position for the oxygen sensors, the exhaust system should be installed on the
motorcycle.

NOTE: Quantity of two S&S PN 106-2061 and PN 55-1593 is required. Some components may be supplied with an S&S complete engine kit.
3- For the best performance, the oxygen sensors should be positioned 4”-12” from the exhaust flange. If you are using a stock rear FLT head pipe

with a “Y” in it, make sure the oxygen sensor is located at least 3” downstream of the “Y” on the right-hand side of the motorcycle.

4- Once the oxygen sensor location has been determined on each head pipe, use one of the PN 55-1593 oxygen sensor bosses to trace a line on

the outside shape of the boss onto the pipe. This outline of the boss will help you in mounting the boss to the head pipe when the exhaust
system is not mounted on the motorcycle.

NOTE: A good trick that S&S technicians have used for locating oxygen sensors is to thread the boss onto an old oxygen sensor that has the front tip cut off.
This then allows the technician to position the oxygen sensor the way it would be after completion and allows them to easily trace the outside of the boss.
See Picture 3.

5- Remove the exhaust system after you have traced the location of the oxygen sensor on both head pipes. Locate the center of the circle that

was traced and drill a ¾” hole in each pipe.

NOTE: Use an appropriate size drill bit or die grinder to achieve the ¾” hole.

Picture 3

CAUTION