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carburetor
adiustment
CAUT
ION:
WHEN
FOLLOWING
STEPS
1
THRU
5
BELOW,
USE
EXTREME
CARE
TO
AVOID
CONTACT
WITH
MUFFLER,
HEAT
SHIELD
OR
MOVING
PARTS
TO
PREVENT
INJURY.
ALSO,
BELT
GUARD
MUST
BE
IN
PLACE.
MAIN
FUEL
AND
IDLE VALVE
ADJUSTMENT
LOW
SPEED
SET
ON
GOVERNOR
LlNKAGE-
SMALL
GAP
HERE
AT
NO
LOAD
MAIN
FUEL
(HIGH
SPEED)
ADJUSTMENT
THROTTLE
IDLE
STOP
ADJUSTMENT
SCREW
SIDE
VIEW
FIG.21
INITIAL
ADJUSTMENT:
REAR
VIEW
The
carburetor
has
a
main
fuel
valve
adiusting
screw
and
an
idle
valve
adjusting
screw.
(Fig.
21).
A
low
speed
adjustment
screw
is
shown
in
(Fig.
22).
1.
Turn
main
fuel
valve
clockwise
until
it
just
closes.
CAUTION:
Valves
may
be
damaged
by
turning
then
in
too
far.
2.
Now
open
main
fuel
valve
1
turn
counterclockwise.
3.
Close
idle
valve
in
same
manner
and
open
it
5/8
turn
(counterclockwise).
4.
Thi
s
initial
adjustment
wi
II
permit
engine
to
start
and
warm
up
prior
to
final
adjustment.
FINAL
ADJUSTMENT
1.
Turn
main
fuel
valve
in
until
engine
misses
(lean
mixture),
than
turn
it
out
past
the
point
where
en·
~ine
runs
smoothly
until
engine
runs
unevenly
(rich
mixture).
Turn
valve
to
mid·point
between
I
ean
and
ri
ch
so
eng
i ne
runs
smooth
Iy.
2.
Hold
engine
at
idle
position
and
set
low
speed
adjustment
screw
(Fig.
22)
until
a
fast
idle
is
obtained
(1200
rpm).
3.
Hold
throttle
in
idle
position
and
turn
idle
adjust·
ment
valve
in
(lean)
and
out
(rich)
until
engine
idles
smoothly.
4.
Reset
low
speed
adjustment
screw
so
engine
idles
at
1200
rpm.
5.
Re
lease
thrott
le·eng
i
ne
shou Id
acce
lerate
without
hesitation.
If
engine
does
not
accelerate
properly,
readjust
main
fuel
valve
by
turning
out
slightly.
IMPORT
ANT:
Do
not
open
more
than
Y2
turn
be-
yond
maximum
power
point.
LOW
SPEED
ADJUSl
MENT
0©J~===-=Q.m
.........
-
o 1
__
-
SET
LOW
SPEED
ADJUSTMENT
SO
ENGINE
RUNS
AT
1200
RPM
IN
"SLOW"
POSITION.
~
4824R·7. 1.74
FIG.
22
spark
FIG.
23
SPARK
PLUG
GAP
0.025"
GASOLINE
SPARK
PLUGS:
Check,
clean
and
reset
spark
plugs
every
100
operating
hours.
Replace
spark
plugs
that
show
signs
of
fouling
or
electrode
erosion
.
. 025
(cold)
BREAKER
POINTS:
Check,
clean
and
reset
breaker
points
every
200
operating
hours.
Replace
points
if
they
are
pitted
or
burned.
Set
point
gap
to
.025
cold
when
fu
Ily
open.
tire
s
air
pressure
in
tires.
G
--'-+-'--11
To
remoy.£,
a
front
tire
and
wheel,
proceed
as
fol·
lows:
1.
Block
up
Tractor
rocker
bar
(front
axle)
securely
or
use
a
Sears
Tractor
Jack.
2.
Remove
hex
bolt
(A),
and
dust
cap
(8).
3.
Remove
gripco
nut
(C),
wear
washer
(D),
pin
(E),
and
washer
(F),
from
spindle
shaft
as·
sembly
(G).
4.
After
tire
is
repaired,
reverse
above
procedure
for
reassembly.
A
rear
whee
I and
tire
is
removed
by
remov
i ng
the
five
hub
bolts
from
wheel
and
hub.
FI
RST:
Block
up
rear
axle
securely
or
use
a Sears
Tractor
Jack.
Sears
or
your
local
service
station
can
repair
your
Tractor
tire
in
the
same
manner
as
an
automobile
•
12.
tire.
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