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3.Adjust I dleSpeed Screw
5. Clean dirtfromaround t herocker
[_
ARNING:
The cutting attachment may spin during
idle speed adjustments. Wear protective clothing and
observe all safety instructions to prevent serious personal
injury.
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 screwdriver
in between the Air
Filter Cover and the Engine Cover (Fig. 30). 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), until the attachment
stops turning.
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 carburetor
adjusted by a Sears or other qualified service
dealer.
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 after the first 10 hours of operation and every 25
hours of operation.
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. 31).
arm cover. Remove the screw
holding the rocker arm cover with
Rocker
a large flat blade screwdriver
or
Arm
Torx T-25 bit (Fig. 32). Remove
Cover
the rocker arm cover and gasket.
\
\
6.
Pull the starter rope slowly to
bring the piston to the top of its
Spark
travel, (known as top dead
Plug
center). Check that:
Hole
The piston is at the top of its travel.
Look in the spark plug hole to view
the piston (Fig. 33)
Both rocker arms move freely, and
both valves are closed.
Rocker Arms
INTAKE
Fig. 32
Adjusting
Nuts
EXHAUST
Feeler Gauge
Spark Flug
Hole
Fig. 33
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
stem and rocker arm (Fig. 34). Measure both the intake and
exhaust valves.
Adjusting
Rocker Arm
View Of The Rear Engine Cover
Remove
Screws
[
I
[
]
[
]
[
] C_DGI
Fig. 31
Remove
Screws
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. 31).
.003-.006 in.
(.076-.152
ram)
Feelertauge
Valve Stem
Fig. 34
The recommended
clearance for both intake and exhaust is .003 -
.006 in. (.076 - 0.152 mm). 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 33 and 34.
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