TABLE
6-2.
CARBURETOR ADJUSTMENT SPECIFICATIONS
MODEL
NHE
MIXTURE
SETTINGS
FLOAT*
IDLE
MAIN
LEVEL
1/16
t
1/32
in.
1
f1/4
2
f
1/4
(1.6
f
0.8
mm)
and adjust the sensitivity
of
the governor as speci-
fied in the Governor section. Add and remove a
full load several times to make certain the set
does not bog down
or
hunt.
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 effec-
tive solution is a complete carburetor overhaul.
In general, overhauling acarburetor consists of com-
plete disassembly, a thorough cleaning, and re-
placement 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 are
given below. Carefully note the position of all parts
while removing to assure correct placement when
reassembling. Read through all the instructions
before beginning
for
a better understanding of the
procedures involved. Carburetor components are
shown in Figure
6-15.
IDLE
CHOKESHAFT ADJUSTMENT
I
SCREW
FLOA1
SPRING
@
MAIN ADJUSTMENT
SCREW
ASSEMBLY
\
XFS-1604
FIGURE
6-15.
CARBURETOR
OVERHAUL
-
GASOLINE
1.
Remove the air cleaner adapter and the automatic
choke assembly.
2.
Remove throttle and choke plate retaining
screws, then plates. Pull out throttle and choke
shafts, being careful not to damage the teflon
coating applied to some throttle shafts.
3.
Remove main and idle mixturescrew assemblies.
4.
Separate the lower section of thecarburetor (fuel
bowl) from the upper section (fuel bowl cover) of
the carburetor.
5.
Carefully note position of float assembly parts,
then slide out retaining pin and remove the float
assembly, any springs
or
clips, and the needle
valve.
6.
Unscrew and remove needle valve seat.
Clean and Repair;
When the carburetor is completely
disassembled, clean and repair using the following
procedure.
1.
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.
-1’:
Most parts cleaning solvents
severe personal injury
if
used improperly. Follow
the manufacturers recommendations when
cleaning parts.
2.
Clean all carbon from the carburetor bore, espe-
cially where the throttle choke plates seat. Be
careful not to plug the idle or main fuel parts.
3.
Blow out all passages with compressed air. Avoid
using wire
or
other objects
for
cleaning that might
increase the size of critical passages.
4.
Check the condition of any needle valve not
included in repair kit and replace if damaged
(Figure
6-16).
Replace float if loaded with fuel
or
damaged.
5.
Check the choke and throttle shafts for excessive
play in their bore and replace if necessary.
6.
Replace old components with new parts included
in repair kit.
1
I
are flammable and can cause
Reassembly and Installation:
When the carburetor
parts are clean and dry, reassemble using thefollow-
ing procedure.
6-1 5
Redistribution or publication of this document
by any means, is strictly prohibited.
Redistribution or publication of this document
by any means, is strictly prohibited.
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