Carburetor Overhaul
Carburetion problems not corrected by mixture or float
adjustments are usually a result of gummed-up fuel
passages or worn internal parts. The most effective
solution is a complete carburetor overhaul.
In general, overhauling a carburetor consists
of
com-
plete disassembly, a thorough cleaning, and replace-
ment of worn parts. Carburetor repair kits are available
that supply new gaskets and replacements for those
parts most subject to wear.
General instructionsfor overhauling a carburetor areas
follows: Carefully note the position while removing all
parts to ensure correct placement when reassembling.
Read through all the instructions before beginning for a
better understanding of the procedures involved. Car-
buretor components are shown in Figure 6-10.
Removaland Disassembly:
Remove the carburetor and
intake manifold assembly asspecified in the Carburetor
and Intake Manifold Assembly in this section. Remove
the carburetor from the intake manifold and disassem-
ble using the following procedure.
1.
2.
Remove the main and idle mixture screw
assemblies.
Separate the lower section of the carburetor.
Remove the float chamber by removing the bolt from
the bottom
of
the carburetor.
V
CHOKE
PLATE
PILOT
JET
SCREW
/
3.
Carefully note position of the float assembly parts,
then slideout retaining pin and remove thefloat and
needle valve.
4.
Unscrew and remove the main nozzle.
Do
not remove the choke
or
throttle plates, shafts, arms
or
governor
link bushing unless they are defective.
Clean
and
Repair:
When the carburetor
is
completely
disassembled, clean and repair using the following
procedure.
1.
2.
3.
4.
5.
6.
Soak all metal components not replaced by repair
kit in carburetor cleaner.
Do
not soak non-metal
floats or other non-metal parts. Follow the cleaner
manufacturer's recommendations.
Clean all carbon from the carburetor bore, espe-
cially where the throttle and choke plates seat. Be
careful not to plug the idle or main fuel ports.
Blow
out all passages with compressed air. Avoid
using wire or other objects for cleaning that might
increase the size
of
critical passages.
Check the condition
of
any needle valve and
replace
if
damaged (Figure 6-1
1).
Replace float
if
loaded with fuel or damaged.
Check the choke and throttle shafts for excessive
play in their bore and replace
if
necessary.
Replace old components with new parts included in
repair kit.
THROTTLE
IDLE
SCREV-
SCREW
\?
FUEL BOWL GASKET
FUEL
4
BOWL
L-74
WASHER
-b@
O-RING
-ik
BOLT
/-
NT
THROTTLE
PLATE
FS-176D
CAP
SPRING
PLATE
FIGURE
6-10,
CARBURETOR OVERHAUL
6-1
4
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