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AiR FILTER MAINTENANCE
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_L_
ARNING:
To avoid serious personal injury, always turn the
unit off and allow it to cool before cleaning or maintaining it.
Cleaning
the Air Filter
Air Filter Cover
Slot
Clean and re-oil the air filter every
"_
10 hours of operation.
It is an
important
item to maintain.
Failure
to maintain the air filter properly
can result in poor performance
or
can cause permanent damage to
the engine.
Tab
Hooks
Air Filter
1.
Open the air filter cover. Push
the tab on the left side of the
Fig. 23
cover in, swing the air filter
cover out, and off the air filter
U
housing (Fig. 23).
2.
Remove the air filter (Fig. 23).
3.
Wash the filter in detergent
and water (Fig. 24). Rinse the
filter thoroughly and allow it
to dry.
4.
Apply enough clean SAE 30
motor oil to lightly coat the
filter (Fig. 25).
Fig. 24
5.
Squeeze the filter to spread
and remove excess oil (Fig. 26).
6.
Replace the filter (Fig. 23).
NOTE:
Operating the unit
without the air filter, will
VOID the warranty.
7.
Reinstall the air filter cover.
Position the tabs on the
sides of the air filter cover
onto the slots at the top of
Fig. 25
the back plate (Fig. 23).
8.
Push the cover in until the tab
on the air filter backplate
snaps into place in the slot on
the air filter cover (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. 27).
Fig. 26
NOTE:
Careless adjustments
can seriously damage the unit. Aside from
idle speed, only a Sears or other qualified service dealer should
make carburetor
adjustments.
First, Check Fuel
Old fuel is usually the reason for improper unit performance. Drain and refill the tank
with fresh fuel prior to making any adjustments. Refer to Oil and Fuel Information.
Second, 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.
Third, Adjust Idle Speed Screw
adjustments.
Wear protective
clothing and observe all safety
instructions
to prevent serious personal injury.
If, after checking the fuel and
Idle Adjustment
cleaning the air filter, the engine
Screw
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
Fig. 27
engine stops, insert a small phillips in between the Air Filter Cover and
the Engine Cover (Fig. 27). Turn the idle speed screw in, clockwise,
1/8
of a turn at a time (as needed) until the engine idles smoothly.
NOTE:
The cutting attachment
should not rotate when the engine idles.
3.
If the cutting attachment
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
m
_
ARNING:
To avoid serious personal injury, always turn the
unit off and allow it to cool before cleaning or maintaining
it.
This requires disassembly of the engine. If 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 after
the first 10 hours of
View
of the
Rear
Engine
Cover
operation and every 40
hours of operation.
The engine must be cold when
checking
or adjusting the valve
Screws
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. 28).
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. 28).
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. 29). Remove the rocker
arm cover and gasket.
Rocker
6.
Pull the starter rope slowly to
Arms
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
Exhaust
Screws
Rocker
Arm
Cover
Spark
Plug
Hole
Fig. 29
INTAKE
Adjusting
Nuts
EXHAUST
Fig. 30
Rocker Arm
looking into the spark plug hole.
Adjusting ____
/
(Fig. 30)
Nut
_
--
Feeler
n._o
Gauge
Both rocker arms move freely,
L.
and both valves are closed
If these statements
are not true,
0.003-0.006 i
repeat step 6.
(0.076-0.152 ram)
7.
Slide the feeler gauge between
the rocker arm and the valve
return spring. Measure the
Fig. 31
clearance between the valve
stem and rocker arm (Fig. 31). Measure both the intake and exhaust valves.
The recommended
clearance for both intake and exhaust is .003 - .006 in.
(.076 - 0.152 rnrn). 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 30 and 31.
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. 31).
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 Norn).
10. Check the spark plug and reinstall. See Replacing the Spark Plug.
11.
Replace the spark plug wire.
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