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4.
5.
Apply enough clean SAE 30 motor oil to lightly coat the filter (Fig. 26).
Squeeze the filter to spread and remove excess oil (Fig. 27).
ROCKER ARM CLEARANCE
This requires disassembly
of the engine. If you feel unsure or unqualified to
perform this, take the unit to a Sears or other qualified service dealer.
NOTE:
Inspect the valve to rocker arm clearance with a feeler gauge per
the Maintenance Schedule.
• 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 seven (7) screws on the back of the engine cover with a
Flat-head or T-25 Torx screwdriver (Fig. 30).
Fig. 26
Fig. 27
6.
Replace the filter (Fig. 24).
NOTE:
If the unit is operated without the air filter, you will VOID the warranty.
7.
Reinstall the air filter cover. Position the slots on the top of the air filter
cover onto the tabs at the top of the back plate (Figs. 25 & 29).
8.
Swing the cover down until the tab on the air filter backplate snaps into
place in the slot on the air filter cover (Fig. 28).
Air Filter Cover
Remove
,
Screws
\
Air Filter
Back Plate
Tab
Fig. 28
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. 29).
NOTE:
Careless adjustments
can
seriously damage your unit.
Aside from the idle speed, only
a Sears or other qualified
service dealer should make
carburetor adjustments.
1. Check Fuel
Old fuel is usually the reason for
improper
unit performance.
Drain and
refill the tank with fresh fuel prior to
ldle Adjustment
Fig. 29
making any adjustments.
Refer to Oil and Fuel Information.
2. Clean Air Filter
The condition of the air filter is important to the operation of the unit. A dirty
air filter will restrict air flow. This is often mistaken for an out of adjustment
carburetor. Check the condition of the air filter before adjusting the idle
speed screw. Refer to Air Filter Maintenance.
3. Adjust Idle Speed Screw
If, after checking the fuel and cleaning the air filter, the engine still will not
idle, adjust the idle speed screw as follows:
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 trigger and let the engine idle. If the engine stops,
insert a small phillips in between the Air Filter Cover and the Engine
Cover (Fig. 29). Turn the idle speed screw in, clockwise,
1/8 of a turn at
a time (as needed) until the engine idles smoothly.
Checking the fuel, cleaning the air filter, and adjusting the idle speed should
solve most engine problems. If not and all of the following are true:
the engine will not idle
• the engine hesitates or stalls on acceleration
there is a loss of engine power
Have the unit serviced by a Sears or other qualified service dealer.
Fig. 30
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. 30).
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. 31).
Remove the rocker arm cover and gasket.
Rocker
6.
Pull the starter rope slowly to bring the
Arm Cover
piston to the top of its travel, (known as
\
top dead center). Check that:
The piston is at the top of its travel. Look
in the spark plug hole to view the piston
(Fig. 32).
Both rocker arms move freely, and both
valves are closed.
If these statements
are not true, repeat step 6.
7.
Slide the feeler gauge between the rocker
arm and the top of each valve stem.
Measure the clearance between the valve
Fig. 31
stem and rocker arm (Fig. 32). Measure
both the intake and exhaust valves.
The recommended
clearance for both intake and exhaust is .003 - .006 in.
(.076 - 0.152 ram). Use a standard automotive
.005 in. (0.127 mm) feeler
gauge. The feeler gauge should slide between the rocker arm and valve stem
with a slight amount of resistance, without binding. See Figures 32 and 33.
8.
If the clearance is not within specification:
a. Turn the adjusting nut using a 5/16 inch (8 mm) wrench or nut driver
(Fig. 32).
To increase clearance, turn the adjusting nut counterclockwise.
To decrease clearance, turn the adjusting nut clockwise.
b. Recheck both clearances, and adjust as necessary.
9.
Reinstall the rocker arm cover using a new gasket. Torque the screw to
20-30 inolb (2.2-3.4 Nom).
10.
Check the spark plug and reinstall. See Replacing the Spark Plug.
11.
Replace the spark plug wire.
12.
Reinstall the engine cover. Check alignment of the cover before
tightening the screws. Tighten screws.
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