12
*NON METALLIC ITEMS - CAN BE DAMAGED
BY HARSH CARBURETOR CLEANERS
The check ball is a non serviceable
item. Clean with carburetor spray and
low air pressure only.
Loosen screw until it just clears
throttle lever, then turn screw in 1
turn.
Place detent reference mark to
proper location. See chapter
appropriate to specific carburetor.
Check spring for return action and
binding.
Remove welch plug and blow air
through air passages.
*MAIN NOZZLE WITH CHECK BALL
*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 of air horn.
Primer bulb models have a Teflon
one way valve, in or behind the fitting.
Remove and replace.
Proper installation of assembly is
important. See appropriate chapter
for procedures.
Gasket and diaphragm sequence
may be reversed on some models.
Head of rivet must touch inlet needle.
Hole must be clean. On models with
primer bulb, vent hole is very small
and is located off center or in the
primer bulb.
CHOKE SHAFT AND LEVER
CHOKE SHUTTER
*DIAPHRAGM GASKET
*DIAPHRAGM
ATMOSPHERIC VENT HOLE
*INLET
FITTING
*INLET SEAT
GASKET
*INLET NEEDLE
SEAT AND
SPRING
ASSEMBLY
CARBURETOR SERVICE PROCEDURE
THROTTLE SHAFT AND LEVER
THROTTLE SHUTTER
DETENT
REFERENCE MARK
THROTTLE SHAFT
RETURN SPRING
DUST SEALS
CHOKE SHAFT
AND LEVER
CHOKE PLATE
SOFT BAFFLE PLUG
Do not attempt to remove. Blow air
through passage.
Check shaft for looseness or binding.
Shutter must be positioned with
detent reference mar ks on top
parallel with shaft.
Check spring for return action
and binding.
Remove when cleaning and replace
with new seals.
FLOAT
FLOAT BOWL
*GASKET
Check shaft for binding.
Blow air through passage. Do not re-
move restrictor if present.
MAIN NOZZLE
AIR BLEED
INLET
NEEDLE CLIP
Must hook over float tab.
*FLOAT BOWL
GASKET
Replace.
*INLET NEEDLE
AND SEAT
INLET FITTING
FLOAT SHAFT
Proper installation is important. See
appropriate chapter for procedures.
MAIN JET
*NON METALLIC ITEMS - CAN BE DAMAGED
BY HARSH CARBURETOR CLEANERS
Clean with compressed air.
FUEL PICK UP
Set float to proper level.
Check float for leaks or dents. Clean
bowl and adjust float level position
gasket or gaskets.
MAIN NOZZLE
IDLE,
INTERMEDIATE
AND AIR BLEED
ORIFICES
FUEL
Clean with compressed air.
BOWL NUT
Long straight end of clip must face
the choke end of the carburetor.
IDLE SPEED ADJUSTMENT SCREW
Loosen screw until it just clears
throttle lever, then turn screw in 1
turn.
Summary of Contents for AH520 -
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