AdjustIdleSpeedScrew
WARNING:Thecuttingattachmentmayspinduring
idlespeedadjustmentsWearprotectiveclothingand. observeallsafetyinstructionstopreventserious personalinjury.
If,aftercheckingthefuelandcleaningtheairfilter,theengine
stillwillnotidle,adjusttheidlespeedscrewasfollows:
1.Starttheengineandletit runatahighidleforaminuteto
warmup.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. 29). 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
View Of The Rear Engine Cover
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Remove | [ | I | Remove | |
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Screws |
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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. Cleandirtfromaroundthe
rocker arm cover. Remove
the screw | holding | the rocker | Rocker |
arm cover | with a large flat | Arm | |
blade screwdriver | or Torx T- | Cover |
25 bit (Fig. 31). Remove the rocker arm cover and gasket.
6.Pull the starter rope slowly to Spark bring the piston to the top of Plug its travel, (known as top dead Hole center). Check that:
The piston is at the top of its |
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travel while looking in the spark |
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plug hole (Fig. 32). |
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Both rocker arms move freely, | Fig. 31 | |
and both valves are closed. |
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Rocker Arms | Ad | Nuts |
INTAKE |
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EXHAUST
Feeler Gauge
Spark Plug
Hole
Fig. 32
If these statements are not true, repeat this step.
7.Slide the feeler gauge between the rocker arm and the valve return spring. Measure the clearance between the valve stem and rocker arm (Fig. 33). Measure both the intake and exhaust valves.
Adjusting
Rocker Arm
C
Valve Stem
The recommended clearance for both intake and exhaust is
.003
.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.
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