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MAINTENANCE & REPAIR INSTRUCTIONS
5.
Squeeze the filter to spread
and remove excess oil (Fig. 28).
6.
Replace the filter (Fig. 25).
NOTE:
If the unit is operated
without the air filter, you
will VOID the warranty.
7.
Reinstall the air filter cover.
Position the slots on the
bottom of the air filter cover
onto the tabs at the bottom
of the back plate (Figs. 25).
8.
Swing the cover up until the
tab on the air filter backplate
snaps into place in the slot on
the air filter cover (Fig. 25).
CARBURETOR 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. 29).
NOTE:
Careless adjustments
can seriously damage
the unit. An authorized
service dealer should
make carburetor
adjustments.
Check Fuel Mixture
Old and/or improperly mixed fuel
is usually the reason for improper
unit performance. Drain and refill
the tank with fresh, properly-
mixed fuel prior to making any adjustments. Refer to Oil and Fuel
Information.
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 and change the air/fuel mixture. 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.
Adjust Idle Speed Screw
WARNING:
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 mixture and cleaning the air filter, the engine still
will not idle, adjust the idle speed screw as follows:
1.
Start the engine and run for
one 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
into the idle adjustment
screw (Fig. 29). Turn the idle
speed screw clockwise 1/8
of a turn at a time (as needed) until the engine idles smoothly.
3.
If the engine appears to be idling too fast, turn the idle speed screw
counterclockwise 1/8 of a turn at a time (as needed), to reduce idle
speed.
Checking the fuel mixture, 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 an authorized service dealer.
REPLACING THE SPARK PLUG
Use replacement #753-06193, a Champion RDJ8J spark plug, or
equivalent. The correct air gap is 0.025 inch (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. Grasp the plug wire firmly and pull
it from the spark plug.
2.
Clean around the spark plug. Remove the spark plug from the cylinder
head by turning a 5/8-inch socket counterclockwise.
Fig. 26
Fig. 27
Fig. 28
Idle Adjustment
Screw
Fig. 29
MAINTENANCE & REPAIR INSTRUCTIONS
WARNING:
Do not sand blast, scrape or clean spark plug
electrodes. Grit in the engine could damage the cylinder.
3.
Replace a cracked, fouled or
dirty spark plug. Set the air
gap at 0.025 in. (0.635 mm)
using a feeler gauge (Fig. 30).
4.
Install a correctly-gapped
spark plug in the cylinder
head. Tighten by turning the
5/8-inch 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.
CLEANING
WARNING:
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 a fueled unit where fumes may reach an open flame or spark.
• Allow the engine to cool before storing.
• Store the unit locked up 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
If planning on storing the unit for an extended time, use the following storage
procedure:
1.
Drain all fuel from the fuel tank into a container with the same 2-cycle
fuel mixture. Do not use fuel that has been stored for more than 30
days. Dispose of the old fuel/oil mix in accordance to Federal, State
and Local regulations.
2.
Start the engine and allow it to run until it stalls. This ensures that all
fuel has been drained from the carburetor.
3.
Allow the engine to cool. Remove the spark plug and put 1 oz. (30 ml)
of any high quality motor oil or 2-cycle 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 unit after storage.
4.
Thoroughly clean the unit and inspect it for any loose or damaged
parts. Repair or replace damaged parts and tighten loose screws, nuts
or bolts. The unit is ready for storage.
OPTIONAL ACCESSORY
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.
316.85951 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Plug-In Power Start
316.85952 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Power Bit Start
9
0.025 in.
(0.635 mm)
Fig. 30
Electric Start Feature
Description
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