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MAINTENANCE AND REPAIR INSTRUCTIONS
LINE INSTALLATION
WARNING:
Never use metal-reinforced line, wire, chain or rope. These can break off and become
dangerous projectiles.
This section covers both SplitLine® and standard
single line installation.
Always use original equipment manufacturer 0.080 in.
(2.03 mm) replacement line. Line other than the
specified may make the engine overheat or fail.
There are two methods to replace the trimming line:
• Wind the inner reel with new line
• Install a prewound inner reel
Removing the Existing Inner Reel
1. Hold the outer spool with one hand and unscrew
the bump knob counterclockwise (Fig. 12).
Inspect the bolt inside the bump knob to make
sure it moves freely. Replace the bump knob if
damaged.
2. Remove the inner reel from the outer spool (Fig. 13).
3. Remove spring from the inner reel (Fig. 13).
4. Use a clean cloth to clean the the inner reel,
spring, shaft, and inner surface of the outer spool.
5. Check the indexing teeth on the inner reel and
outer spool for wear (Fig. 14). If necessary,
remove burrs or replace the reel and spool.
NOTE:
Always use the correct line length when
installing trimming line on the unit. The
line may not release properly if the line
is too long.
Single Line Installation
Go To Step 8 for SplitLine® Installation:
6. Take approximately 20 feet (6 m) of new
trimming line, loop it into two equal lengths.
Insert each end of the line through one of the
two holes in the inner reel (Fig. 15). Pull the line
through the inner reel so that the loop is as
small as possible.
7. Wind the lines in tight even layers onto the reel
(Fig. 16). Wind the line in the direction indicated
on the inner reel. Place an index finger between
the two lines to stop the lines from overlapping.
Do not overlap the ends of the line. Proceed to
step 12.
SplitLine® Installation
8. Take approximately 10 feet (3 m) of new trimming line. Insert one end of the line through one of the two holes in the
inner reel (Fig. 17). Pull the line through the inner reel until only about 4 inches is left out.
9. Insert the end of the line into the open hole in the inner reel and pull the line tight to make the loop as small as
possible (Fig. 17).
10. Before winding, split the line back about 6 inches.
11. Wind the line in tight even layers in the direction indicated on the inner reel.
NOTE:
Failure to wind the line in the direction indicated will cause the cutting head to operate incorrectly.
12. Insert the ends of the line into the two holding slots (Fig. 18).
13. Insert or slide the ends of the line through or into the eyelets in the outer spool and place inner reel with spring
inside the outer spool (Fig. 19). Push the inner reel and outer spool together.
NOTE:
The spring must be assembled on the inner reel before reassembling the cutting head.
14. While holding the inner reel and outer spool, grasp the ends and pull firmly to release the line from the holding slots
in the spool.
15. Hold the inner reel in place and install the bump knob by turning clockwise. Tighten securely.
INSTALLING A PREWOUND REEL
1. Hold the outer spool with one hand and unscrew the bump knob counterclockwise (Fig. 12). Inspect the bolt inside
the bump knob to make sure it moves freely. Replace the bump knob if damaged.
2. Remove the old inner reel from the outer spool (Fig. 13).
3. Remove the spring from the old inner reel (Fig. 13).
4. Place the spring in the new inner reel.
NOTE:
The spring must be assembled on the inner reel before reassembling the cutting head.
5. Insert or slide the ends of the line through or into the eyelets in the outer spool (Fig. 19).
6. Place the new inner reel inside the outer spool. Push the inner reel and outer spool together. While holding the inner
reel and outer spool, grasp the ends and pull firmly to release the line from the holding slots in the spool.
7. Hold the inner reel in place and install the bump knob by turning clockwise. Tighten securely.
AIR FILTER MAINTENANCE
WARNING:
To avoid serious personal injury, always turn the unit off and allow it to cool before you
clean or service it.
Cleaning the Air Filter
Clean the air filter every 10 hours of operation. It is
an important item to maintain. Failure to maintain
the air filter properly can result in poor performance
or can cause permanent damage to the engine.
1. Open the air filter cover by pressing the lock tab
in and pulling out on the air filter cover (Fig. 20).
2. Remove the air filter (Fig. 20).
3. Wash the filter in detergent and water (Fig. 21).
Rinse the filter thoroughly and allow it to dry.
4. Apply enough clean SAE 30 motor oil to lightly
coat the filter (Fig. 22).
5. Squeeze the filter to spread and remove excess
oil (Fig. 23).
6. Replace the air filter into the base plate (Fig. 20).
NOTE:
Operating the unit without the air filter
WILL VOID the warranty.
7. Reinstall the air filter cover. Position the two
small tabs on the air filter cover into the two
slots in the base plate and press the air filter cover down, making sure to align the lock tab with the lock tab slot,
until it snaps into place (Fig. 20).
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. 24).
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 will 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. 24). 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.
4
Bump Knob
Bolt
Fig. 12
Indexing Teeth
Fig. 14
Fig. 16
Index Teeth
Eyelets
Spring
Fig. 18
Air Filter Cover
Tab
Air
Filter
Fig. 20
Fig. 22
Idle Adjustment Screw
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
Outer Spool
turning a 5/8-inch socket counterclockwise.
WARNING: Do not sand blast, scrape or clean electrodes. Grit in the
engine could damage the cylinder.
Spring
3. Replace a cracked, fouled or dirty spark plug. Set the air gap at 0.025 in. (0.635 mm)
Inner Reel
using a feeler gauge (Fig. 25).
4. Install a correctly-gapped spark plug in the cylinder head. Tighten by turning the
Fig. 13
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
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
Loop
• Never store a fueled unit where fumes may reach an open flame or spark.
Fig. 15
• 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 60 days. Dispose of the old fuel/oil mix in accordance to Federal, State and Local regulations.
Loop
Fig. 17
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.
Fig. 19
ENGINE WILL NOT START
CAUSE
Empty fuel tank
Primer bulb wasn't pressed enough
Engine is flooded
Old or improperly mixed fuel
Fouled spark plug
ENGINE WILL NOT IDLE
CAUSE
Air filter is plugged
Old or improperly mixed fuel
Improper carburetor adjustment
ENGINE WILL NOT ACCELERATE
CAUSE
Old or improperly mixed fuel
Cutting head bound with grass
Dirty air filter
ENGINE LACKS POWER OR STALLS
CAUSE
Old or improperly mixed fuel
Fouled spark plug
CUTTING HEAD WILL NOT ADVANCE LINE
CAUSE
Cutting head bound with grass
Cutting head out of line
Inner reel bound up
Cutting head dirty
Line welded
Line twisted when refilled
Not enough line is exposed
Fig. 21
CUTTING LINE ADVANCES UNCONTROLLABLY
CAUSE
Oil, cleaner or lubricant in cutting head
IF FURTHER ASSISTANCE IS REQUIRED, CONTACT AN AUTHORIZED SERVICE DEALER.
Fig. 23
ENGINE*
Engine Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air-Cooled, 2-Cycle
Stroke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.02 in. (2.6 cm)
Displacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 cc
Operating RPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6,300+ rpm
Idle Speed RPM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3,200 - 4,400 rpm
Ignition Type. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Electronic
Ignition Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rocker Switch
Spark Plug Gap . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.025 in. (0.635 mm)
Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fuel/Oil Mixture
Fuel/Oil Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40:1
Carburetor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Diaphragm, All-Position
Starter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . EZ-Pull Version 3™
Muffler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Baffled with Guard
Throttle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Manual Spring Return
Fuel Tank Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 fl.oz. (296 ml)
DRIVE SHAFT AND CUTTING HEAD*
Drive Shaft Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Steel Tube
Throttle Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Finger-Tip Trigger
Total Approximate Unit Weight (without fuel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 lbs. (4.5 kg)
Cutting Mechanism. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bump Head™
Line Spool Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 in. (76.2 mm)
Trimming Line Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.080 in. (2.03 mm)
Cutting Path Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 in. (40.64 cm)
Fig. 24
*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.
MAINTENANCE AND REPAIR INSTRUCTIONS
TROUBLESHOOTING
ACTION
Fill fuel tank with properly mixed fuel
Press primer bulb fully and slowly 10 times
With blue choke lever in position 3, squeeze the trigger
and pull the starter rope
Drain fuel tank and add fresh fuel mixture
Replace or clean the spark plug
ACTION
Replace or clean the air filter
Drain fuel tank and add fresh fuel mixture
Adjust according to the Carburetor Adjustments section
ACTION
Drain fuel tank and add fresh fuel mixture
Stop the engine and clean the cutting head
Clean or replace the air filter
ACTION
Drain fuel tank and add fresh fuel mixture
Replace or clean the spark plug
ACTION
Stop the engine and clean cutting head
Refill with new line
Rewind the inner reel
Clean inner reel and outer spool
Disassemble, remove the welded section and rewind
Disassemble and rewind the line
Push the bump knob and pull out line until 4 inches (102 mm)
of line is outside of the cutting head
ACTION
Clean and thoroughly dry the cutting head
SPECIFICATIONS
0.025 in.
(0.635 mm.)
Fig. 25
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