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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 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
in
(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.
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
-
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
counterclock-
wise
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.
Lever
Idle Mixture Valve i
With Limiter
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.
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