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Adjusting Nuts CLEANING
• 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
INTAKE
Rocker
Arms
EXHAUST
Fig. 31
Exhaust Rocker Arm
Adjusting __ /
Nut __ ./ Feeler
Gauge
0.003-0.005in. ,L_L__Z,____'J r
(0.076-0.152 ram)
Valve Stem
Fig. 32
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 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.
REPLACING THE SPARK PLUG
Use a replacement Champion ® #RDZ4H spark plug. The correct air gap
is 0.025 in. (0.635 rnrn). Remove the plug after every 40 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
-- iWARNING: Do not sand blast, scrape or clean spark plug
electrodes. Grit in the engine could damage the cylinder.
cylinder head by turning a 5/8
in. socket counterclockwise.
4. Replace cracked, fouled or
dirty spark plug. Set the air
gap at 0.025 in. {0.635 rnrn)
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.olb. (12.3-13.5 Nora}
Do not over-tighten.
SPARK ARRESTOR MAINTENANCE
0.025 in.
{0.635 ram)
t
Fig. 33
1.
2.
3.
4.
5.
6.
Remove the rear engine cover. See Rocker Arm Clearance.
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).
Pull the tab on the spark arrestor cover out of the muffler. Remove the
spark arrestor cover.
Remove the spark arrestor
screen from the spark
arrestor cover.
Clean the spark arrestor
screen with a wire brush or
replace it.
Reinstall the spark arrestor
screen, spark arrestor cover
and screws.
Muffmer Spark Arrestor
Cover
1"-25
Screw
Slot
1"-20Screw _
m
_L_ ARNING: To avoid serious personal injury, always turn the
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
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.
NOTE: Remove the spark plug and drain all of the oil from the cylinder
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.
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.craftsman.com.
Electric Start Feature
item No. Description
316.85951 ..................................... Plug-In Power Start
316.85952 ........................................ Power Bit Start
Fig. 34
9
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