Rivera Primo Shovel User Manual

SU CARBURETOR

SU CARBURETOR

INSTALLATION INSTRUCTIONS for:

INSTALLATION INSTRUCTIONS for:

SHOVEL & IRON XL

SHOVEL & IRON XL

EVO BIG TWIN

EVO BIG TWIN

& TWIN CAM MODELS

& TWIN CAM MODELS

Rivera Primo’s SU Eliminator Carburetor Kits deliver amazing performance & fuel economy !
We are confident that, once installed, your kit will bring you many miles of great service.

Please take a few moments & read this manual carefully as it will provide you with the
proper procedure for installing the kit as well as guide & advise you through the tuning
process.

Every SU Carburetor is hand-built, then modified for your application, to Rivera Primo’s
specifications prior to re-assembly & shipping to you. All carburetors are jetted for stock
applications unless otherwise noted or ordered for a special application. Great care has
been taken to assure that you’re getting a kit worthy of fitment on your motorcycle !

Complete bolt-on kits include an SU carb in a polished or chrome finish, choice of manifold,
all necessary hardware, gaskets, two spare needles for tuning purposes (see tuning section
of this manual) and a chrome front air cleaner with an embossed SU insignia.

Note: In some Evo Big Twin applications, relocation of the V.O.E.S. switch may be necessary to clear MAP sensor boss.
Note: This manual has an exploded view of the carburetor, complete with breakdown of all component pieces for easy

identification & ordering, if necessary.
Note: All fuel inlets are 5/16” for adequate flow. For performance engines we suggest a high-flow Golan petcock &

fuel filter. The carburetor should be cleaned on a yearly basis depending on the amount of use. Develop the habit of turning
off the fuel valve when the engine is not running.

Note: Do not oil in the dampener. Once a month remove the dome cap & lightly spray WD-40 inside on the piston shaft. If the
carb is run in extremely dusty conditions we suggest cleaning the foam air filter element once a month. For best results use
warm, soapy water for this task.

12450 Whittier Blvd. Whittier, CA Tel: [phone] Fax: [phone] www.riveraprimoinc.com

1108-0001 Rev. 10/2012

Not legal for sale or use in California or on any pollution controlled motor vehicles.

SU Instructions 1108-0001_SU Instructions 1108-0001.qxd 10/4/12 10:13 AM Page 1

BEFORE BEGINNING THE INSTALLATION:

Disconnect the BATTERY.

Drain & then remove GAS Tank per O.E. manual.
This step requires that there be no heat source or sparks in the vicinity.

Remove CARBURETOR & INTAKE MANIFOLD per O.E. manual.

TWIN CAM ENGINES: Reuse MAP SENSOR / SEAL & SCREW from O.E. intake manifold.

FIGURE 1

FIGURE 2

FIGURE 3

FIGURE 3A

For TWIN CAM ENGINES drill a 3/16”
hole thru the center of the MAP
SENSOR boss breaking thru the
manifold wall (only perform this
operation with the manifold off the
bike).

NOTE

: Remove all burrs & aluminum
chips.
(SEE FIGURE 1)

On TWIN CAMS install MAP
SENSOR / SEAL & SCREW.

NOTE

: Replace MAP SESOR SEAL
if torn or cracked.

(SEE FIGURE 2)

On TWIN CAM ENGINES install sup­port bracket on tappet blocks.

Mount this bracket on the inside
rear tappet block screws.

(SEE FIGURE 3 & 3A)

2

Install 2 each 5/16-18 x 1­1/4” hex head bolts with 2
each 5/16” lockwashers and
leveling bracket on the bot­tom right bolt of the mani­fold.

Install 2 each 5/16-18 nuts
and leave loose at this time.

(SEE FIGURE 4)

FIGURE 4

FIGURE 5

Install flanges and seals on the
intake manifold.
NOTE: Flanges are marked front
& rear.

Install intake manifold with 2
each 5/16-18 x 1” socket head
cap screws on cam cover side
and 2 each 5/16-18 x 3/4”
12 point screws on the primary
side. NOTE

: Leave screws loose

at this time.

TWIN CAM ENGINES

: Reinstall
MAP SENSOR ELECTRICAL
PLUG.

(SEE FIGURE 5)

TWIN CAM ENGINES: Install
carburetor leveling bracket to
support bracket with 1 each
5/16-18 x 3/4” hex head bolt with
5/16” flatwasher thru leveling
bracket and support bracket
with 5/16” lockwasher and 5/16­18 nut on back side of support
bracket.

EVO ENGINES

: The leveling
bracket bolts to the case bolt
between the cylinders.

NOTE

: Leave screws loose at

this time.

(SEE FIGURE 6)

Remove dome and piston from
the carburetor.

NOTE

: Be extra careful to not
drop any foreign matter into
the carburetor body with the
dome off.

(SEE FIGURE 7)

FIGURE 7

FIGURE 6

SU Instructions 1108-0001_SU Instructions 1108-0001.qxd 10/4/12 10:13 AM Page 2

3

FIGURE 8

FIGURE 9

FIGURE 10

FIGURE 11

FIGURE 12

Remove 2 each 5/16-18 nuts
from the intake manifold that
you previously installed (see
Figure 4). Now install 2 each
5/16-18 x 1-1/4” hex head bolts
(small head) thru the top
intake manifold holes.

Install the supplied carburetor
gasket.

Install the carburetor onto the
intake manifold with 2 each
5/16-18 nuts on the bottom
two bolts.

(SEE FIGURE 8)

Install the throttle
cables onto the carbu­retor dual rotor &
bracket.

(SEE FIGURE 9)

Level the carburetor
and tighten the intake
manifold flange screws.

(SEE FIGURE 11)

Tighten the carburetor
leveling bracket.

(SEE FIGURE 12)

Install throttle cable
bracket on the carbure­tor(top) side using 2 each
5/16-18 x 1-1/4” hex head
bolts with 2 each 5/16-18
nuts.
(SEE FIGURE 10)

Tighten the four carb to
intake manifold bolts.

FIGURE 13

FIGURE 13A

Reinstall the carburetor dome & piston. Tighten the 3 screws.

(SEE FIGURE 13 & 13A)

Install the fuel line and tighen.

NOTE

: Route the fuel line
away from the heads or any
other heat source.

(SEE FIGURE 14)

Adjust the throttle cables per
the O.E. manual.

FIGURE 15

FIGURE 15A

Install the top end breather fittings. The dual outlet is for
the rear head, the single outlet is for front head.

TWIN CAM ENGINES

: 3/8-16 banjo bolt with 1/2” seal washer on

the outside and 3/8” seal washer on the engine side.

EVO ENGINES

: 1984-1992 uses 3/8-16 banjo bolt.

1993-up uses 1/2-13 banjo bolt.

NOTE

: Leave banjo bolts loose at this time.

(SEE FIGURE 15)

Cut black breather hose and install it onto the top end breathers.
Now tighten the banjo bolts.

(SEE FIGURE 15A)

NOTE

: Route breather hose so there are NO KINKS in the hose.

FIGURE 14

Install the rubber grommet
into the air cleaner backing
plate.

(SEE FIGURE 16)

FIGURE 16

SU Instructions 1108-0001_SU Instructions 1108-0001.qxd 10/4/12 10:13 AM Page 3