Service Manual
Replace the carburetor
if
there is excessive play
in
the choke and throttle shafts.
Replace the idle adjustment needle
if
it
is bent, worn
or
damaged in
any
way.
Assembly
CAUTION
The mixture adjustment screw is
easiiy damaged. Turn the mixture adjustment
screw in only until light tension
can
be
feit.
When installing the idle adjusting screw, turn the
screw in until LIGHT tension is felt. For Spec
C
turn
the screw
out
3-1/8 turns. For
Specs
A
and
B
turn
the screw
out
2-1/2
turn.
Turn the carburetor body upside down to assemble
the main jet, main nozzle (Specs
A
and
B),
float
valve, float and float bowl as illustrated in Figure 9-1
or
9-2.
Torque the carburetor mounting
bolts
to
the torque
specified in
ASSEMBLY
TORQUES,
reconnect the
fuel line and throttle and choke links and secure the
air cleaner assembly.
See the instructions that follow in this section
for
governor, choke and
speed
adjustments.
Co
Adjustment
If
a
CO
(Carbon Monoxide) meter is available, ad-
just the idle mixture screw to provide
6%
to
7%
CO
at
3300
rpm
with
no load on the engine.
If
a meter
is
not available, set the idle mixture screw at
3-1/8
turns
out
(Spec
C)
or
2 1/2
turns
out
(Specs
A
and
B)
as noted above.
LOW
IDLE
FLOAT
CHAMBER
FIGURE
9-2.
GASOLINE
CARBURETOR
(SPECS
A
AND
B
)
9-2