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CLEAN
COOLING SYSTEII
-
Grass, chaff
or dirt
may
@d
the air cooling
system,
especially
after
prolonged
service cutting
dry
grass.
Yearly
or every
100 hours, whichever occurs
first, remove the
blower
housing and clean
the areas shown
-to
avoid over-
speeding, overheating
and engine
damage. Clean
more
often
if necessary.
DANGER: Periodically
clean
muffler
area to remove all
grass,
dirt and
combustible debris.
SPARK PLUG
-
Clean and reset
gap
at .030"
every
100
hours
of
operation.
CAUTION: Do not blast clean spark
plug.
Spark
plug
should be cleaned by scraping or wire brushing
and
washing
with a commercial solvent.
Sparking can occur
if
wire terminal does
not fit.firmly on
spa+t<
ptusi
or if stop switetr+ib+ates agai+st spark
plug.
Reform terminal
or
repair switch
if
necessary.
REMOVE COMBUSTION
DEPOSITS
every
100-300 hours
of operation.
Remove
cylinder
head and
cylinder
head
shield. Scrape and
wire brush the combustion
deposits
from cylinder, cylinder
head, top of
piston
and around
valves.
Use
a soft brush
to remove deposits.
Re-assemble
gasket,
cylinder head and cylinder
head
shield.
Turn
screws down
finger tight with
the three longer screws
around
the
exhaust
valve,
if
so equipped.
Torque cylinder
head
screws
in a
staggered
sequence
to
140 inch
pounds
(15.82
Nm).
SPARK
ARRESTER
EOUIPPED
MUFFLER
-
lf engine
en assemblY,
remove every 50 hours for cleaning and
inspection.
Replace if
damaged.
ADJUSTMENTS
CARBURETOR ADJUSTMENTS
Minor
carburetor
adjustment
may be
required to com-
pensate
lor
differences
in fuel, temperature, altitude
or
load.
TO
ADJUST CARBURETOR
-
Turn needle
valve clock-
wise until
it
just
closes.
CAUTION:
Valve
may
be
damaged
by
turning
it
in
too far'
Now open needle valve
172 turns counterclockwise.
This
initial adjustment
will
permit
the engine to be started
and
warmed up
prior
to
final adjustment.
FINAL ADJUSTMENT
Place
governor
speed
control
lever
in
"FAST"
position.
Turn
needle
valve in until engine
misses
(clockwise
-
lean
mixture)
then turn
it out
past
smooth
operating
point
until
engine
runs unevenly
(rich
mixture).
Now
turn
needle
valve
to the
midpoint
between
rich and
lean so
the engine
runs
smoothly.
Next, adiust
idle
RPM.
Rotate
throttle
counter-
clockwise
and
hold against
stop.
Adjust
idle speed
adjusting
screw
to obtain
1750 RPM.
Release
throttle
-
engine
should
accelerate
without
hesitation
or
sputtering.
lf engine
does
not accelerate
properly,
the carburetor
should
be
re-adjusted, usually
to a slightly
richer
mixture.
CONTROL
ADJUSTMENTS:
Proper choke
and speed control
operation
is dependent
upon
proper
adjustment of
remote controls
on
the
powered
equipment.
TO CHECK OPERATION
OF CHOKE
CONTROLS:
Remove air cleaner.
Move
remote control
leverto
"CHOKE"
or
"START"
position.
Choke
should
be
fully closed
as
shown.
Replace air cleaner.
To Adjust:
Place remote control
lever
on
equipment
in FAST
position.
Choke operating link
"A"should
be
justtouching
bellcrank
lever
at
"8."
See
illustration.
SPEED CONTROL
ADJUSTMENT
The acceptable operating speed
range
is 1800to 3600
RPM.
ldle speed
is 1750 RPM. The
manufacturer of
the equip-
CLEAN
OUT
CHAFF
AND
DIRT
.030"
(.76
mm)
FEELER GAUGE
CHOKE
LINK