10
*NON METALLIC ITEMS - CAN BE DAMAGED
BY HARSH CARBURETOR CLEANERS
Check ball is not serviceable on some
models.
Remove adjustment screw. To adjust
20° slant engines, the engine must be
mounted in its normal 20° slant posi-
tion.
Loosen screw until it just clears throttle
lever, then turn screw in 1 turn.
Place detent reference mark to proper
location.
Check spring for return action and bind-
ing.
Remove welch plug and blow air
through air passages.
WELCH PLUG (If Present)
*MAIN NOZZLE CHECK BALL (If Present)
*IDLE MIXTURE
ADJUSTMENT
SCREW AND "O"
RING (If Present)
*MAIN MIXTURE
ADJUSTMENT
SCREW AND "O"
RING (If Present)
THROTTLE SHAFT
RETURN SPRING
THROTTLE SHAFT AND LEVER
DETENT REFERENCE MARK
ON THROTTLE SHUTTER
THROTTLE SHUTTER
IDLE SPEED ADJUSTMENT SCREW
Check shaft for binding. Position shut-
ter opening towards inlet fitting side or
air horn.
Blow air through passage.
Part of inlet fitting. If fuel is restricted,
clean or replace fitting.
Bulb primer models have Viton* one
way valve, in or behind fitting.
Remove and replace.
Proper installation of assembly is im-
portant.
Gasket and diaphragm sequence may
be reversed on some models. Head of
rivet must touch inlet needle. Rivet is
hooked into inlet needle control lever on
some models.
Hole must be clean. On models with
bulb primer, vent hole is very small and
is located off center.
CHOKE SHAFT AND LEVER
CHOKE SHUTTER
MAIN NOZZLE
*DIAPHRAGM GASKET
*DIAPHRAGM
ATMOSPHERIC VENT HOLE
*INLET
FITTING
SCREEN
*INLET
FITTING
*INLET SEAT
GASKET
*INLET NEEDLE
SEAT AND
SPRING
ASSEMBLY
9
COMPONENTS
IDLE AND INTERMEDIATE
AIR BLEED
THROTTLE SHAFT AND LEVER
THROTTLE SHUTTER
DETENT
REFERENCE MARK
THROTTLE SHAFT
RETURN SPRING
IDLE AND INTERMEDIATE
ORIFICES
IDLE AND INTERMEDIATE
FUEL CHAMBER (COVERED
WITH WELCH PLUG)
IDLE AND INTERMEDIATE
FUEL MIXTURE PASSAGE
*IDLE ADJUSTMENT SCREW
AND "O" RING
IDLE SPEED ADJUSTMENT
CHOKE SHAFT
AND LEVER
CHOKE PLATE
ATMOSPHERIC VENT
SOFT BAFFLE PLUG
Blow air through passage.
Loosen screw until it just clears throttle
lever, then turn screw in one turn.
Removable on emission carbs. non-
metallic only.
Check shaft for looseness or binding.
Shutter must be positioned with detent
reference marks on top parallel with
shaft and to the right or 3 o'clock posi-
tion.
Check spring for return action
and binding.
Remove idle adjustment screw. Check
needle tip and condition of "O" ring.
Remove welch plug and blow out all
passages.
FLOAT
FLOAT BOWL
*GASKET
IDLE FUEL TRANSFER PASSAGE
AND ANNULAR GROOVE
Check shaft for binding position open-
ing to bottom of air horn.
Blow air through passage. Do not re-
move restrictor if present.
HIGH SPEED
AIR BLEED
INLET
NEEDLE CLIP
(If Present)
Must hook over float tab.
*FLOAT BOWL
GASKET
Replace.
*INLET NEEDLE
AND SEAT
INLET
FITTING
FLOAT
SHAFT
Proper installation is important.
NUT AND MAIN ADJUSTMENT SEAT
*MAIN ADJUSTMENT SCREW AND
"O" RING SEAL
IDLE AND INTERMEDIATE
FUEL TRANSFER PASSAGE
METERING ROD OR PIN IN
FUEL TRANSFER PASSAGE
BALL PLUG
CUP PLUG
IDLE AND INTERMEDIATE
FUEL TRANSFER PASSAGE
IDLE AND MAIN FUEL PICK UP ORFICE
*NON METALLIC ITEMS - CAN BE DAMAGED
BY HARSH CARBURETOR CLEANERS
NOTE: On models which have metering
rods, do not install idle adjustment screw
with carburetors upside down, as pin
will obstruct movement of adjustment
screw causing damage
(DO NOT REMOVE)
If the carburetor is used on a 20° slant
engine, the engine must be in its normal
20° slanted position for adjustment.
Check float for leaks or dents. Clean
bowl and adjust float level position gas-
ket or gaskets.
Check needle for damage and "O" ring
for cracks. Clean all passages in nut
with compressed air.
10
IDLE
MAIN NOZZLE
(EMULSION TUBE)
IDLE PROGRESSION
HOLE
IDLE AIR BLEED
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