Gasoline Carburetor Overhaul
(Prior
to
Spec
F)
See Figure 6-18. Carburetor problems not cor-
rected by mixture or float adjustments are often
caused by gummed-up fuel passages
or
worn inter-
nal parts. The most effective remedy is to replace
or
overhaul the carburetor. Overhauling a carburetor
consists of complete disassembly, thorough clean-
ing and replacement of worn parts. Repair kits are
available for gasoline carburetors that include new
gaskets and float assembly parts.
Disassembly: Carefully note how the carburetor
parts fit together as the carburetor is being
disassembled so that it will be easier to reassemble.
Read and understand these instructions before
starting.
1.
Remove the air cleaner adapter and the auto-
matic choke assembly (gasoline carburetors).
2.
Remove the main and idle mixture screw as-
semblies.
3.
Separate the lower section of the carburetor
(float bowl) from the body of the carburetor.
4.
Carefully note the position of the float assembly
parts, then remove the hinge pin, float and
needle valve.
Cleaning
and
Inspection: .
1 . Soak all metal components not replaced by the
repair kit
in
carburetor cleaner. Do not soak any
rubber or plastic parts. Follow the cleaner
manufacturer's recommendations.
I:AWARNINGI
Most
parts
cleaning
solvents
are flammable
and
corrosive
and
can cause
severe
burns
and
inflammation. Use
only
as
recommended
by
the manufacturer.
2.
Clean all carbon from the carburetor bore, es-
pecially where the throttle and choke plates
seat.
Be
careful not to plug the idle or main fuel
ports.
3.
Blow out all passages with compressed air. Do
not use wire
or
other objects for cleaning that
might increase the size of critical passages.
6-23
4. Replace the fuel mixture screws if they are
scored (Figure 6-19).
5.
Replace the carburetor
if
either the choke
or
the throttle sticks after cleaning. It is usually not
necessary to disassemble the throttle
or
choke.
~
CHOKE
-,~---
SHAFT
MAIN FUEL
_______.,!
MIXTURE
ADJUSTING
.:+Jl
ASSEMBLY
JEP
CHOKE
PLATE
THROTTLE
SHAFT
FUEL
INLET
NEEDLE
VALVE
FLOAT
BOWL
FIGURE 6-18. GASOLINE CARBURETOR
CHECK FOR
SCORING HERE
FIGURE 6-19. TYPICAL FUEL MIXTURE SCREW
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