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TO ADJUST
CARBURETOR
NOTE:
The carburetor
on this engine
is
low emission.
It is equipped
with an idle
fuel adjusting
needle
with a limiter
cap,
which
allows
some adjustment
within
the
limits allowed
by the cap.
Do not attempt
to remove
the limiter
cap.
The limiter
cap
cannot
be removed
without
breaking
the
adjusting
needle.
The carburetor
has been preset
at the
factory
and adjustment
should
not be nec-
essary.
However,
minor
adjustment
may
be required
to compensate
for differences
in fuel, temperature,
altitude
or load.
If the
carburetor
does
need adjustment,
proceed
as follows:
In general,
turning
idle mixture
valve
in
(clockwise)
decreases
the supply
of fuel to
the engine
giving
a leaner
fuel/air
mix-
ture.
Turning
the idle mixture
valve
out
(counterclockwise)
increases
the supply
of fuel to the engine
giving
a richer
fuel/air
mixture.
IMPORTANT:
Damage
to the needle
valve
and the seat in carburetor
may result
if screw
is turned
in too tight.
PRELIMINARY
SETTING
-
1. Air cleaner
assembly
must
be assem-
bled to the carburetor
when
making
carburetor
adjustments.
2.
Be sure the throttle
control
cable
is
adjusted
properly
(see above).
FINAL
SEFrlNG
-(See "TO ADJUST
THROTTLE
CONTROL
CABLE"
in this
section
of the manual.)
1.
Start engine
and allow
to warm for five
minutes.
Make
final adjustments
with
engine
running
and shift/motion
control
lever in neutral
position.
2.
Move throttle
control
lever to slow posi-
tion. With finger,
rotate
and hold throttle
lever
against
idle speed
screw.
Turn
idle speed
screw
to attain
1750 RPM.
3.
While
still holding
throttle
lever against
idle speed
screw,
turn idle mixture
valve full travel
clockwise
then coun-
terclockwise
until engine
runs rough.
Turn valve to a point midway
between
those
two positions.
Release
throttle
lever.
ACCELERATION
TEST
-
4. Move throttle control lever from slow
to fast position.
If engine hesitates or
dies, turn idle mixture valve out (coun-
terclockwise)
1/8 turn.
Repeat test and
continue to adjust, if necessary,
until
engine accelerates
smoothly.
High speed stop is factory adjusted.
Do
not adjust or damage may result.
IMPORTANT:
Never tamper with the
engine governor, which is factory set
for proper engine speed.
Overspeed-
ing the engine above the factory high
speed setting can be dangerous.
If you
think the engine-governed
high speed
needs adjusting, contact a Sears or other
qualified service center, which has proper
equipment
and experience to make any
necessary adjustments.
Governor
Control Lever
Governor Control Plate
H/_I_
_Zhrottlecable
Idle Speed
Lever
Idle Mixture
Valve with
Limiter
28
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