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Shovelhead/ironhead xl installation instructions, Applications, Disassembly – Rivera Primo Mikuni 42mm Carb - SH & XL User Manual

Page 2: Installation 1. intake manifold, Throttle cables, Throttle cable adjustment

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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