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SECTION IV - MINOR OVERHAUL INSTRUCTIONS-----------
normal idling speed requirements by turn-
ing IDLE SPEED REGULA TING SCREW,
located in throttle stop boss, INWARD.
Next, slowly turn IDLE MIXTURE SCREW
inward until motor begins to lose speed
and miss or flutter; then turn screw
in
opposite direction, usually
about
one-eighth
of
a
turn, until engine functions smoothly
and steadily.
D. IDLE SPEED REGULA TING SCREW: This
adjustment is made after the above two
adjustments. Engine will be idling faster
than normal at this
point.
Now slowly
back out
IDLE
SPEED
REGULA TING
SCREW until desired idling speed is
ob-
tained. Refer to figure 17.
IDLE SPEED
REGULATING SCREW
IDLE MIXTURE
SCREW
MAIN ADJUSTMENT
SCREW
IDLE MIXTURE
SCREW~
MAIN ADJUSTMENT
SCREW
CHOKE LEVER
(RUNNING POSITION)
CHOKE LEVER
Figure
17.
Carburetor Adjustment
4. 4 FUEL LINE AND TANK
Remove and clean fuel line and tank.
Refer to
exploded view in Section VI that applies to the en-
gine
assembly.
Parts are numbered in order
of
disassembly.
18
A. Remove fuel line from inlet on carburetor
and on fuel tank.
If
fuel line is difficult
to disengage, use a screw driver to pry
ends loose from inlets. Clean fuel line
thoroughly with
grease
solvent and blow
out with
air.
B. Remove fuel tank from engine by remov-
ing screws holding adapter. Some models
have additional engine cowling or throttle
linkage which will first have to be re-
moved.
If
necessary, release bands hold-
ing tank to cowling or adapter bracket.
Clean
out
tank thoroughly with a
grease
solvent.
If
a gummy substance still re-
mains, use
alcohol
to clean. Be certain
to remove shut-off valve to thoroughly
clean the valve and screen. Blow air into
tank and through inlet to
air
dry thorough-
ly.
C. Reassemble fuel tank, adapter and cowl-
ing and install
on
engine •. Connect throttle
linkage if disconnect was necessary.
In-
stall fuel line by pushing ends over inlet
on fuel tank and carburetor. Reassemble
all
parts in ·reverse order of sequence
shown on exploded views.
4. 5 ADJUSTMENTS
Ignition system - for easy starting, best perform-
ance
and plug life maintain a magneto breaker point
setting of . 020" and
a
spark plug gap of . 035".
The following examples indicate the
effects
of im-
proper settings, on the magneto secondary output
voltage:
Magneto closepoint setting (. 008" to • 010
')
-
results in hard starting caused by low voltage
at normal cranking speeds.
Magneto wide point setting (. 030" to . 032
')
-
may cause rapid plug fouling, intermittent
secondary voltage output or even no secondary
voltage output.
Spark plug close electrode
gap
(. 020"
and
under) - may cause rapid plug fouling because
of bridging.
Spark plug wide
electrode
gap (. 040" and high-
er) - may cause hard starting because of the
high voltage required to jump the gap under
compr_
e ssion.
Governor linkage - adjustment of linkage for prop-
er speed control by the air
vane
type
governor
is
accomplished on horizontal models previous to 1959
as
follows: (Refer to figure 18)
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