Rivera Primo Mikuni 42mm Carb - SH & XL - Manual (Page 2)

APPLICATIONS
This installation instruction set applies to the Rivera-MIkuni HSR42
carburetor kits for 1970-1984 Harley-Davidson "Shovelhead" Big-
Twin & 1971-1985 Iron Head XL motorcycles. Intake manifold, all nec-
essary hardware & a high performance Mikuni / K&N air filter are
included. 1990-95 style throttle cable cables are required.
DISASSEMBLY
1) Disconnect the negative (minus) battery terminal.
2) Turn the gas petcock to the off position.
3) Removes the gas tank(s) from the motorcycle or elevate
the rear of the gas tanks for better access to the
cylinder/intake manifold area.
4) Remove the air cleaner assembly including backing
plate.
5) Disconnect the choke cable from the motorcycle.
6) Disconnect the vacuum hoses and gas supply hose from
the carburetor.
7) Remove the carburetor from the motorcycle.
8) Remove existing throttle cables. 1990-1995 OEM style
throttle cables are required.for this installation.
INSTALLATION
1. INTAKE MANIFOLD
A) Attach the enclosed rubber flange to the Rivera intake
manifold with 2 each 5/16" X ¾" bolts & flat washers.
B) Attach the Mikuni intake manifold assembly to the heads
in place of the stock intake manifold. Do not torque the
clamps tight at this time; later, installation of the air cleaner
assembly will bring the manifold into proper alignment.
Please note
Special adapter rings are included to be used on the
intake manifold as illustrated. These rings enable the
use of "rubber-band" style manifold seals and large
diameter clamps. See the following illustration.
2. CARBURETOR INSTALLATION
A) Insert the carburetor spigot into the rubber flange, and
tighten the clamp securely.
3. THROTTLE CABLES
CAUTION
Two throttle cables are REQUIRED for the HSR carb. If
you do not have a dual cable pull-open, pull-closed
throttle cable assembly, you must obtain a dual cable
throttle assembly. Lubricate throttle cables prior to
connecting to carburetor..........
USE 1990-95 OEM throttle cables
A) Route the cables to the carburetor along the right side of
the frame (just like stock). Next, route the cable below the
top motor mount to the carb
B) Connect the cables to the carburetor bracket as shown.
First the pull-to-close cable (idle cable) and then the pull-to-
open cable.
4. THROTTLE CABLE ADJUSTMENT
A) Rotate the throttle grip to the full open position, look into
the throttle bore and see if the throttle valve (slide) opens
completely. If the throttle valve does not open completely
unscrew the adjuster on the opening cable until it does. This
adjustment should be made carefully to assure maximum
carburetor performance. After adjustment tighten the
adjuster jam nut.
B) After adjusting the open cable, adjust throttle freeplay
with the closing (idle) cable to approximately 1/8" an indi-
cated in the following illustration.
note
It is very important to adjust the cables in the preceding
described manner to ensure that the idle cable operates
correctly for safety. It must close the throttle completely
2
PLEASE NOTE
USE CAUTION
PLEASE NOTE
SAFETY WARNING
pull open cable
pull close cable
SHOVELHEAD/IRONHEAD XL
Installation Instructions