5B - 10 - MERCARB 2 BBL CARBURETOR
90-816462 2-695
4. With boat in open water, place remote control in
forward gear, idle position.
5. Disconnect throttle cable barrel from anchor stud.
Be sure not to lose spacer on anchor stud.
6. Adjust idle speed adjustment screw to obtain
550-600 RPM, in neutral gear.
7. With engine running at specified RPM, adjust idle
mixture needle as follows:
a. Turn idle mixture needle in (clockwise) until
the engine speed begins to drop due to lean
mixture.
b. Turn idle mixture screw out (counterclock-
wise) until the speed begins to drop due to rich
mixture.
c. Turn screw in to a point between these two ex-
tremes to obtain maximum engine smooth-
ness and RPM.
d. Readjust idle speed adjustment screw until
engine idles at 650-700 RPM in forward gear.
IMPORTANT: Refer to Section 2 - “Removal and
Installation” for throttle cable installation and ad-
justment.
Repair
NOTICE
Refer to “Precautions,” in this section, BE-
FORE proceeding.
Removal
IMPORTANT: Carburetor malfunctions are, in
many cases, caused by the presence of dirt, water
or other foreign matter in carburetor. To aid in
diagnosis, carefully remove carburetor from en-
gine without draining fuel from bowl. Contents of
fuel bowl may then be inspected for contamina-
tion as carburetor is disassembled.
1. Remove ventilation hose from flame arrestor,
then remove flame arrestor.
IMPORTANT: Place a clean cloth in bores of car-
buretor to prevent dirt and foreign material from
falling into bores.
2. Turn fuel supply off at fuel tank.
3. Disconnect throttle cable from carburetor.
4. Remove fuel line from fuel inlet nut, using wrench
to stabilize fuel inlet nut.
5. Remove fuel pump sight tube from carburetor.
6. Disconnect electric choke.
7. Remove carburetor attaching nuts and washers
and remove carburetor.
IMPORTANT: Place a clean cloth over intake man-
ifold opening to prevent dirt or foreign material
from entering manifold.
8. Remove and discard gaskets.
Installation
1. Thoroughly clean gasket surfaces.
2. Place new carburetor base gasket on intake man-
ifold. Install carburetor and secure with nuts and
washers. Torque to 132 lb. in. (15 N·m).
3. If fuel inlet filter nut was disturbed, remove; clean
all threads with brush and carburetor cleaner or
Quicksilver Leveler.
4. Connect fuel line to fuel inlet filter nut, and while
stabilizing filter nut with wrench, tighten fuel line
fitting securely.
5. Connect fuel pump sight tube to fitting on carbure-
tor.
6. Connect electric choke wires to choke cover.
Summary of Contents for 13
Page 1: ...13 Printed in U S A 90 816462 2 695 1995 Brunswick Corporation GM 4 Cylinder MARINE ENGINES ...
Page 2: ...90 816462 2 695 0 ...
Page 7: ...1 A IMPORTANT INFORMATION GENERAL INFORMATION 72000 ...
Page 15: ...1 B 50617 IMPORTANT INFORMATION MAINTENANCE ...
Page 36: ...1 C IMPORTANT INFORMATION TROUBLESHOOTING ...
Page 74: ...2 A 50633 REMOVAL AND INSTALLATION 4 CYL ALPHA ONE DRIVE ...
Page 88: ...3 A 26790 ENGINE 181 CID 3 0L 4 CYLINDER GM ENGINE ...
Page 137: ...4 A 72079 ELECTRICAL SYSTEMS STARTING SYSTEM ...
Page 170: ...4 B 71855 ELECTRICAL SYSTEMS IGNITION SYSTEM ...
Page 197: ...ELECTRICAL SYSTEMS CHARGING SYSTEM 4 C 72078 ...
Page 237: ...4 D 72747 ELECTRICAL SYSTEMS INSTRUMENTATION ...
Page 250: ...4 E 72938 ELECTRICAL SYSTEMS WIRING DIAGRAMS ...
Page 264: ...5 A FUEL SYSTEM FUEL PUMP ...
Page 271: ...5 B 72681 FUEL SYSTEM MERCARB 2 BARREL CARBURETOR ...
Page 300: ...6 A 50628 COOLING SYSTEM SEAWATER COOLED MODELS ...
Page 309: ...6 B 73665 COOLING SYSTEM CLOSED COOLING MODELS ...
Page 325: ...C 6 EXHAUST SYSTEM MANIFOLD ...
Page 331: ...7 A 71317 POWER STEERING PUMP ...