PROBLEM
SOLUTION
Engine overspeed protection engaged
Allow the engine to cool down for 10 minutes before
restarting.
5
MAINTENANCE
The fuel is old (over 30 days) and/or improperly mixed
Drain the fuel tank and add fresh, properly mixed fuel
The air filter is dirty
Clean or replace the air filter
The spark plug is fouled
Replace the spark plug
The fuel is old (over 30 days) and/or improperly mixed
Drain the fuel tank and add fresh, properly mixed fuel
The cutting head is bound with grass
Stop the engine and clean the cutting head
The air filter is dirty
Clean or replace the air filter
The fuel tank is empty
Fill the fuel tank with properly mixed fuel
The primer bulb was not pressed enough
Press the primer bulb 10 times or until fuel is visible
The engine is flooded
Move the choke lever to Position 3, squeeze the throttle
control and pull the starter rope
The fuel is old (over 30 days) and/or improperly mixed
Drain the fuel tank and add fresh, properly mixed fuel
The spark plug is fouled
Replace the spark plug
The cutting head is bound with grass
Stop the engine and clean the cutting head
The cutting head is out of line
Refill the cutting head with new line
The inner reel is bound up
Rewind the line
The cutting head is dirty
Clean the inner reel and outer spool
The line is welded
Open the cutting head and remove the welded section
The line is twisted
Rewind the line
Not enough line is extended
Stop the unit, push the bump knob and pull the line until 4
inches (102 mm) is outside of the cutting head
There is oil, cleaner or lubricant in the cutting head
Clean and thoroughly dry the cutting head
The air filter is dirty
Clean or replace the air filter
The fuel is old (over 30 days) and/or improperly mixed
Drain the fuel tank and add fresh, properly mixed fuel
The idle speed is incorrect
Adjust the idle speed
TROUBLESHOOTING
THE ENGINE WILL NOT START
THE ENGINE WILL NOT IDLE
THE ENGINE WILL NOT ACCELERATE
IF FURTHER ASSISTANCE IS REQUIRED, CONTACT AN AUTHORIZED SERVICE DEALER.
THE ENGINE LACKS POWER OR STALLS WHEN CUTTING
THE CUTTING LINE ADVANCES UNCONTROLLABLY
THE CUTTING HEAD WILL NOT ADVANCE LINE
Engine Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air-Cooled, 2-Cycle
Displacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 cc
Operating RPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6,300+ rpm
Idle Speed RPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,800 - 3,400 rpm
Spark Plug Gap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.025 in. (0.635 mm)
Lubrication. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fuel/Oil Mixture
Fuel/Oil Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40:1
Fuel Tank Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 fl.oz. (296 ml)
Total Approximate Unit Weight (without fuel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 - 11 lbs. (4.5 - 5 kg)
Cutting Mechanism . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bump Head™
Shoulder Strap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Optional
Trimming Line Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.095 in. (2.41 mm)
Cutting Path Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 in. (43.18 cm)
SPECIFICATIONS*
*All specifications are based on the latest product information available at the time of printing. We reserve the right to
make changes at any time without notice.
ENGINE STOPS WHILE IN USE
CLEANING AND STORAGE
CLEANING
Use a small brush to clean 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. Wipe off any moisture with
a soft cloth.
WARNING:
To avoid serious personal injury, always stop the engine and allow it to cool before
cleaning or maintaining the unit.
ADJUSTING THE IDLE SPEED
NOTE:
Careless adjustments can seriously damage the unit. A qualified service dealer should make carburetor
adjustments.
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. Refer to
Starting and Stopping
.
2. Release the throttle control and let the engine idle. If the engine stops, use a small
Phillips screwdriver to turn the idle speed screw clockwise, 1/8 of a turn at a time
(as needed) until the engine idles smoothly (Fig. 24).
3. If the engine is idling too quickly, turn the idle speed screw counterclockwise, 1/8
of a turn at a time (as needed) to reduce the idle speed (Fig. 24).
Checking the fuel, cleaning the air filter, and adjusting the idle speed should solve
most engine problems. If not, and any of the following conditions are true, take the
unit to a qualified service dealer:
• the engine will not idle
• the engine hesitates or stalls on acceleration
• there is a loss of engine power
STORAGE
• Never store a fueled unit 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.
Short-term Storage (1-2 weeks)
1. Store the unit in a horizontal position. If this is not possible, store the unit vertically with the engine at the top.
Long-term Storage
1. Remove the fuel cap, tip the unit and drain the fuel into an approved container.
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 5 drops 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.
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.
Preparing the Unit for Use after Long-term Storage
1. Remove the spark plug and drain all of the oil from the cylinder.
NOTE:
Do not use fuel that has been stored for more than 30 days. Dispose of old fuel according to federal, state
and local regulations.
MAINTAINING THE SPARK PLUG
1. Stop the engine and allow it to cool. Grasp the spark plug boot firmly and pull it from the spark plug.
2. Clean around the spark plug. Remove the spark plug from the cylinder head with a 5/8-inch socket, turning
counterclockwise.
3. Inspect the spark plug. If the spark plug is cracked, fouled or dirty, replace it with
a replacement part
#753-06193
, a
Champion RDJ7J
or an equivalent spark plug.
4. Use a feeler gauge to set the air gap at
0.025 in. (0.635 mm)
(Fig. 25).
5. Install the spark plug in the cylinder head. Tighten the spark plug with a 5/8-inch
socket, turning it clockwise until snug.
NOTE:
If using a torque wrench, torque to:
110-120 in.•lb. (12.3-13.5 N•m). Do not over tighten.
6. Reattach the spark plug boot.
WARNING:
Do not sand blast, scrape or clean spark plug
electrodes. Grit in the engine could damage the cylinder.
Fig. 25
0.025 in.
(0.635 mm)
WARNING:
The cutting head may spin during idle speed adjustments. Wear protective clothing and
observe all safety instructions to prevent serious personal injury.
Fig. 24
Idle Speed Screw