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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. 30)
• 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 valve return spring.
Measure the clearance between the valve 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 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 31 and 32.
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
in•lb (2.2–3.4 N•m).
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.
REPLACING THE SPARK PLUG
Champion
Use a replacement
is 0.025 in. (0.635 mm). Remove the plug after every 25 hours of operation
and check its condition.
1.
Stop the engine and allow it
to cool. Remove the six (6)
screws on the back of the
engine cover with a Flat-
head or T-25 Torx
screwdriver (Fig. 29).
2.
Grasp the plug wire firmly
and pull the cap from the
spark plug.
3.
Clean dirt from around the
spark plug. Remove the spark
plug from the cylinder head by turning a 5/8 in. socket counterclockwise.
WARNING:
Do not sand blast, scrape or clean spark plug
electrodes. Grit in the engine could damage the cylinder.
4.
Replace cracked, fouled or dirty spark plug. Set the air gap at 0.025 in.
(0.635 mm) using a feeler gauge (Fig. 33).
5.
Install a correctly-gapped spark plug in the cylinder head. Turn the 5/8
in. socket clockwise until snug.
If using a torque wrench torque to: 110-120 in.•lb. (12.3-13.5 N•m)
Do not over-tighten.
SPARK ARRESTOR
MAINTENANCE
1.
Remove the rear engine
cover. See Rocker Arm
Clearance.
2.
With a flat blade screwdriver
or Torx T-20 bit and a T-25
bit, remove the screws
attaching the spark arrestor
cover to the muffler (Fig. 34).
MAINTENANCE & REPAIR INSTRUCTIONS
Screw
Rocker Arm
Cover
Spark Plug
Hole
Fig. 30
Adjusting Nuts
INTAKE
Rocker
Arms
Fig. 31
Exhaust
Rocker Arm
Adjusting
Nut
0.003–0.006 in.
(0.076–0.152 mm)
Fig. 32
®
#RDZ4H spark plug
. The correct air gap
0.025 in.
(0.635 mm)
Fig. 33
Spark Arrestor
Muffler
Screen
Cover
Slot
T-20 Screw
Fig. 34
3.
Pull the tab on the spark arrestor cover out of the muffler. Remove the
spark arrestor cover.
4.
Remove the spark arrestor screen from the spark arrestor cover.
5.
Clean the spark arrestor screen with a wire brush or replace it.
6.
Reinstall the spark arrestor screen, spark arrestor cover and screws.
CLEANING
WARNING:
unit off and allow it to cool before cleaning or maintaining it.
Use a small brush to clean off the outside of the unit. Do not use strong
detergents. Household cleaners that contain aromatic oils such as pine and
lemon, and solvents such as kerosene, can damage plastic housing or handle.
Wipe off any moisture with a soft cloth.
STORAGE
• Never store the unit with fuel in the tank where fumes may reach an open
flame or spark.
• Allow the engine to cool before storing.
• Lock up the unit to prevent unauthorized use or damage.
• Store the unit in a dry, well-ventilated area.
• Store the unit out of the reach of children.
LONG TERM STORAGE
EXHAUST
1.
Drain all gasoline from the gas tank into a container. Do not use gas
that has been stored for more than 60 days. Dispose of the old gasoline
in accordance to Federal, State, and Local regulations.
2.
Start the engine and allow it to run until it stalls. This ensures that all
gasoline has been drained from the carburetor.
3.
Allow the engine to cool. Remove the spark plug and put 5 drops of
high quality motor oil into the cylinder. Pull the starter rope slowly to
distribute the oil. Reinstall the spark plug.
Feeler
NOTE:
Remove the spark plug and drain all of the oil from the cylinder
Gauge
before attempting to start the trimmer after storage.
4.
Change the oil, referring to Changing the Oil. Dispose of the old oil in
accordance to Federal, State and Local regulations.
5.
Thoroughly clean the unit and inspect for any loose or damaged parts.
Repair or replace damaged parts and tighten loose screws, nuts or
bolts. The unit is ready for storage.
Valve Stem
TRANSPORTING
• Allow the engine to cool before transporting.
• Secure the unit while transporting.
• Drain the gas tank before transporting.
• Tighten gas cap before transporting.
PLUG-IN POWER START AND POWER BIT START FEATURES
This unit is designed to be started with an optional Plug-In Power Start or
Power Bit Start that are sold separately. If choosing to start the unit using
one of these features or have questions please contact your local retailer or
call 1-800-4-MY-HOME®, for more information and purchasing. You may
also go to www.sears.com/craftsman.
Item No.
T-25
316.85951 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Plug-In Power Start
Screw
316.85952 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Power Bit Start
9
To avoid serious personal injury, always turn the
OPTIONAL ACCESSORY
Electric Start Feature
Description
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