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ENGINE
Maintenance,
repair, or replacement
of the
emission
control devices and systems,
which
are being done at the customers
expense,
may be performed
by any non-road
engine
repair establishment
or individual. Warranty
repairs must be performed
by an authorized
engine manufacturer's
service outlet.
TO ADJUST
THROTTLE
CONTROL
CABLE
The throttle
control
has been preset
at the
factory
and adjustment
should
not be nec-
essary.
Check
adjustment
as described
below
before
loosening
cable.
If adjust-
ment is necessary,
proceed
as follows:
1. With engine
not running,
move throttle
control
lever from slow to choke
posi-
tion.
Slowly
move lever from choke to
fast position.
2.
Check
that holes "A" in governor
control
lever and hole in governor
plate
line-up.
If holes "A" are not aligned,
loosen
clamp screw
and move throttle
cable
until
holes are aligned.
Tighten
clamp
screw
securely.
Governor Control Lever
Governor Control Plate
<
/
"A"
Clamp Screw
Cable
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
necessary.
However,
minor
adjustment
may be required
to compensate
for differ-
ences
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
SETTING
-(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
(N) 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 counter-
clockwise
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.
Overspeeding
the engine
above
the factory
high speed
setting
can be dangerous.
If you think the
engine-governed
high speed
needs
adjust-
ing, contact
a Sears
or other qualified
ser-
vice center,
which has proper equipment
and experience
to make any necessary
adjustments.
Idle Speed
Lever
Idle Mixture
Valve with
Limiter
28
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