Owner's manual

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SU CARBURETOR

INSTALLATION INSTRUCTIONS for:

SHOVEL & IRON XL

EVO BIG TWIN

& 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: 562-907-2600 Fax: 562-907-2606 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

Summary of content (8 pages)

PAGE 1
SU Instructions 1108-0001_SU Instructions 1108-0001.qxd 10/4/12 10:13 AM Page 1 SU CARBURETOR INSTALLATION INSTRUCTIONS for: SHOVEL & IRON XL EVO BIG TWIN & TWIN CAM MODELS Not legal for sale or use in California or on any pollution controlled motor vehicles. 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.
PAGE 2
SU Instructions 1108-0001_SU Instructions 1108-0001.qxd 10/4/12 10:13 AM Page 2 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.
PAGE 3
SU Instructions 1108-0001_SU Instructions 1108-0001.qxd 10/4/12 10:13 AM Page 3 FIGURE 8 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. FIGURE 13 FIGURE 13A 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) Reinstall the carburetor dome & piston.
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SU Instructions 1108-0001_SU Instructions 1108-0001.qxd 10/4/12 10:13 AM Page 4 FIGURE 17 FIGURE 17A Install the air cleaner backing plate onto the carburetor with the gasket and 4 each 5/16-18 x 1/2” hex head screws with 4 each 5/16” star washers and tighten.
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SU Instructions 1108-0001_SU Instructions 1108-0001.qxd 10/4/12 10:13 AM Page 5 ADDITIONAL INSTALLATION INSTRUCTIONS for EARLY MODEL BIG TWINS & SPORTSTERS “O” Ring Manifolds / Panhead Shovelhead and Sportster to 1984 Install the manifold in the usual manner. Slip the “O” rings over the manifold flanges. Position the manifold to the heads. Slip one “O” ring off the manifold flange and install the clamp lightly. Use the same procedure on the other side just snuggling up the clamp.
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SU Instructions 1108-0001_SU Instructions 1108-0001.qxd 10/4/12 10:13 AM Page 6 COLD STARTING & TUNING INSTRUCTION (ALL SU ELIMINATOR CARBURETORS) Turn the fuel on allowing a reasonable time for the fuel bowl to fill. NOTE: if any fuel runs from the hollow shaft on the end of the tickler pump, shut fuel off (if this occurs the needle is stuck in the open position and must be corrected -see setting the fuel level).
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SU Instructions 1108-0001_SU Instructions 1108-0001.qxd 10/4/12 10:13 AM Page 7 SPECIFICATIONS & SPECIAL NOTES Stock Applications: Shovelhead, Sportsters, Evolution Models Supplied with kit as standard: .100 Mainjet - Red Spring 4-1/2 oz. - BBT needle. Stock 900cc Sportster: use BBD needle, 4-1/2 oz.spring, .100 mainjet. Modified Shovelhead and Evolution engines w/headwork, cams, etc: use BBT needle, .100 Mainjet , silver spring 8oz., (BBX alternative needle).
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SU Instructions 1108-0001_SU Instructions 1108-0001.