Specifications

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
position.
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
binding.
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
shutter 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 con-
trol 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 bind-
ing. Shutter must be positioned with
detent reference marks on top par-
allel with shaft and to the right or 3
o'clock position.
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
opening to bottom of air horn.
Blow air through passage. Do not
remove 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 ad-
justment.
Check float for leaks or dents. Clean
bowl and adjust float level position
gasket 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