Dual – Rivera Primo Common Plenum Dual 42mm Mikuni Carburetor Kit (DMK) User Manual

Page 3

CHOKE CABLE INSTALLATION

4.THROTTLE CABLES

The Rivera dual-carb kit was designed to use
the stock 1990 and later throttle cables.
Before attaching the throttle cables, assure
that they are in good operating condition and
well lubricated.

Check to assure that the throttle cable

adjusters are completely backed-off. Insert
the end of the opening cable into the throttle
wheel in the position indicated; do-not insert
the cable housing into the cable bracket at
this time. Insert the end of the closing cable
in the remaining throttle wheel hole (hold the
opening cable out of the way as necessary)
and insert the cable housing into the cable
bracket.

Insert the opening cable housing into

the cable bracket. The cables overlap in the
throttle wheel between the two holes but do-
not rub against each other during operation.

ATTACHING THE THROTTLE CABLES

C. Check the throttle for smooth operation.
Open the throttle to the full open position
and look into the bore of the carburetors to
verify that the throttle valves are fully raised

out of the bores. If they are not, adjust the
opening throttle cable until the throttle valves
clear the bores.

D. Adjust the throttle "free-play" to approxi-
mately 1/8" as indicated by using the closing
throttle cable adjuster to remove excess
cable play.

ADJUSTING THROTTLE FREE-PLAY

4. HOSES

A. FUEL HOSE - Connect the enclosed fuel
hose to the petcock and secure it with an
enclosed hose clamp. Route the fuel line
between the cylinders, below the intake man-
ifold. Cut off any excess hose before attach-
ing it to the carburetors. Secure the hose
with the remaining enclosed clamp.

B. V.O.E.S - As required, attach the vacuum
hose for the V.O.E.S. to the vacuum fitting on
the closest carburetor (after removing the
cap). If required, a longer piece of 3/16" vac-
uum hose is included in the kit.

C. VENT HOSE '92 AND LATER- Connect the
remaining fuel hose to the open fitting on the
vented space and secure with a hose clamp.
Route the hose down between the engines
and transmission. Cut the hose off flush
with the bottom of the engine.

D. CARBURETOR DRAIN HOSES - Route the
two carburetor drain hoses along the front
push rod tube and in front of the crankcase.
Secure them as necessary with cable ties
from the kit.

Before inserting the carburetors into the intake
manifold, make certain that the choke cable is
positioned pointing downward, between the car-
buretors and intake manifold.

B. Insert the carburetor spigots into the manifold
spigot seals with a slight rocking motion.

Putting a small amount of grease on the spigot
seals will ease installation.

D. Secure the carburetors to the manifold by
inserting the 3/8" X 5 1/2" bolt with the 3/8" lock
and flat washers through the mounting hole in the
backing plate and threading it into the manifold.
As the mounting nut is tightened, assure that the
carburetors are sliding into the spigot seals
smoothly and evenly; wiggle the carburetors by
hand to help the process. Tighten the mounting
bolt until the capped carburetor fitting (close to
the mounting bolt) contacts the intake manifold.
The mounting bolt threads should bottom at the
same time.

On rubber mounted engines, check the clearance
between the gas tank and the carburetors, there
should be a minimum of 3/8" at the closest point.
If the clearance is less than this amount, place
the 1/8" thick chrome spacer, included in the kit,
between the intake manifold boss and the sup-
port bracket to create more gas tank clearance.

Having less than 3/8" gas tank clearance may allow

the carburetors to contact the gas tank as the
engine moves during normal operation.

It is very important that the carburetor

mounting bolt is not over-tightened to pre-
vent damage to the seals.

3. CHOKE CABLE

A. Route the choke cable knob up through the tri-
angular space in the manifold If the carburetor
mounting bolt blocks the hole too much, back it
out until the knob fits through then re-tighten the
mounting bolt.

B. The nut that secures the choke bracket to the
manifold is also the jam-nut for the carburetor
mounting bolt. Place the 3/8" flat washers onto
the carburetor mounting bolt and thread on the
locknut, leaving enough space to slide the choke
bracket onto the bolt. Slide the bracket onto the
mounting bolt and tighten the locknut.

Slide the knob into the cable bracket slot

as in the illustration and tighten the jam nut.

DUAL

CARB INST

ALLA

TION

DUAL

CARB INST

ALLA

TION

NOTE

CAUTION

support bracket

choke cable bracket

throttle wheel

attach opening cable here

opening cable

closing cable

3/8" lock nut

toothed

washer

carburetor mount-

ing 3/8" X 5 1/2" bolt

3/8" flat washers

manifold boss

optional

chrome spacer

intake manifold