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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 neces-
sary. Check
adjustment
as described
below
before
loosening
cable.
If adjustment
is
necessary,
proceed
as follows:
1. With
engine
not running,
move
throttle
control
lever from slow to choke
position.
Slowly
move
lever
from
choke
to fast
position.
2.
Check
that holes '_'
in governor
control
lever and hole in governor
plate line-up.
If holes '_' are not aligned,
loosen
clamp
screw
and move throttle
cable until holes
are aligned. Tighten clamp screwsecurely.
Governor
Control Lever
Governor
Control
Plate
Clamp
Screw
Throttle
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 differences
in fuel, tem-
perature,
altitude
or load.
If the carburetor
does need adjustment,
proceed
as follows:
In general,
turning
idle
mixture
valve
Jn
(clockwise)
decreases
the supply
of fuel to
the engine
giving
a leaner
fuel/air
mixture.
Turning
the idle mixture
valve
out (counter-
clockwise)
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.
25
PRELIMINARY
SETTING
-
1. Aircleanerassemblymustbeassembled
to the carburetor
when making carburetor
adjustments.
2.
Be sure
the throttle
control
cable
is ad-
justed
properly
(see above).
FINAL
SETTING
-
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
- damage
may result.
IMPORTANT:
Never tamperwith
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 adjusting,
contact
a Sears
or other
qualified
service
center,
which
has
proper
equipment
and experience
to make
any necessary
adjustments.
Idle Speed
F
Screw-----_
d
01915
Throttle
ever
idle ilixture
Valve_-_
_
With Limiter
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