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AiR FILTER MAINTENANCE
Cleaning
the Air Filter
Failure to maintain the air filter
properly can result in poor
performance
or can cause
permanent damage to the engine.
1.
Open the air filter cover.
Unscrew the knob on the left
side of the cover. Swing the
cover out (Fig. 23).
Remove the air filter (Fig. 23).
2.
3.
Air Filter
Air Filter Cover
Knob
Back Plate
Fig. 23
Hooks
Wash the filter in detergent
and water. Rinse the filter thoroughly and
allow it to dry.
4.
Apply enough clean SAE 30 motor oil to lightly coat the filter.
5.
Squeeze the filter to spread and remove excess oil.
6.
Replace the filter (Fig. 23).
NOTE:
Operating the unit without the air filter, will VOID the warranty.
7.
Make sure the back plate is correctly
positioned (Fig. 23).
8.
Swing the air filter cover closed and tighten the knob (Fig. 23).
iDLE SPEED ADJUSTMENT
The idle speed of the engine is adjustable. An idle adjustment
screw is
between the air filter cover and the engine starter housing (Fig. 24).
NOTE:
Careless adjustments can seriously damage the unit. Aside from idle
speed, only a Sears or other qualified service dealer should make
carburetor adjustments.
If, after checking the fuel and cleaning the air filter, the engine still will not
idle, adjust the idle speed screw as follows:
I _i_
! WARNING:
The blade may spin during idle speed adjustments.
Wear protective clothing and observe all safety instructions
to
prevent serious personal injury.
1.
Start the engine and let it run at a high idle for a minute to warm up.
Refer to Starting/Stopping
Instructions.
2.
Release the throttle lever and
let the engine idle. If the
Idle Adjustment
engine stops, insert a small
Screw
Phillips in between the air
filter cover and the engine
cover (Fig. 24). Turn the idle
speed screw in, clockwise,
1/8 of a turn at a time (as
needed) until the engine idles
smoothly.
NOTE:
The blade should not
Fig. 24
rotate when the engine
idles.
3.
If the blade rotates when the engine idles, turn the idle speed screw
counterclockwise
1/8 of a turn at a time (as needed), to reduce idle
speed.
Checking the fuel, cleaning the air filter, and adjusting the idle speed should
solve most engine problems. If not and any of the following are true have the
unit serviced by a Sears or other qualified service dealer:
• the engine will not idle
the engine hesitates or stalls on acceleration
there is a loss of engine power
ROCKER ARM CLEARANCE
This requires disassembly of the engine. If unsure or unqualified to perform this,
take the unit to a Sears or other qualified service dealer.
The engine must be cold when checking
or adjusting the valve clearance.
This task should be performed inside, in a clean, dust free area.
1.
Remove the six (6) screws on the back of the engine cover with a Flat-
head or T-25 Torx screwdriver (Fig. 25).
2.
Disconnect the spark plug wire.
3.
Clean dirt from around the spark plug. Remove the spark plug from the
cylinder head by turning a 5/8 in. socket counterclockwise.
4.
Remove the engine cover (Fig. 25).
5.
Clean dirt from around the rocker arm cover. Remove the screw holding
the rocker arm cover with a large flat blade screwdriver or Torx T-25 bit
(Fig. 26). Remove the rocker arm cover and gasket.
6.
Pull the starter rope slowly to bring the piston to the top of its travel,
(known as top dead center). Check that:
The piston is at the top of its travel. This should be done by looking into the
spark plug hole. (Fig. 26)
Both rocker arms move freely,
and both valves are closed
View of the Rear Engine Cover
If these statements
are not true,
repeat step 6.
7.
Slide the feeler gauge between
Screws
the rocker arm and the valve
Screws
return spring. Measure the
clearance between the valve
stem and rocker arm (Fig. 28).
Measure both the intake and
exhaust valves.
The recommended
clearance for
Fig. 25
both intake and exhaust is .003 -
Screw _
.006 in. (.076 = 0.152 rnm). Use a
0
standard automotive
.005 in.
Rocker Arm
(0.127 mm) feeler gauge. The
Cover
feeler gauge should slide between
the rocker arm and valve stem
Spark Plug
with a slight amount of resistance,
Hole
without binding (Fig. 27 and 28).
8. If the clearance is not within
specification:
Fig. 26
a.
Turn the adjusting nut using a
5/16 inch (8 mm) wrench or
Adjusting Nuts
nut driver (Fig. 28).
To increase clearance, turn
INTAKE
the adjusting nut
counterclockwise.
EXHAUST
• To decrease clearance, turn
Rocker
the adjusting nut clockwise.
Arms
b.
Recheck both clearances,
and adjust as necessary.
9.
Reinstall the rocker arm
Fig. 27
cover using a new gasket.
Torque the screw to 20-30
Exhaust
Rocker Arm
Adjusting ----
in'lb (2.2-3.4 N,m}.
Nut
__
Feeler
10. Check the spark plug and
_
Gauge
reinstall. See Replacing the
-_
_
--
Spark Plug.
.
.
.
O003-0 006 in.
11.
Replace the spark plug wire.
(0.076-0.152 ram)
12.
Reinstall the engine cover.
Check alignment of the cover
before tightening the screws.
_
Valve Stem
Tighten screws.
Fig. 28
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