5. Check the indexing teeth on the inner reel and
outer spool for wear (Fig. 11). 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. 12). 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. 13) Wind the line in the direction
indicated on the inner reel. Place an index
finger between the two lines to keep 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. 14). 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. 14).
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. 15).
13. Insert the ends of the line through the eyelets in the outer spool and place inner reel with spring inside the outer
spool (Fig. 16). Push the inner reel and outer spool together.
NOTE: The spring must be assembled on the inner reel before reassembling the cutting head.
14. Hold the inner reel in place and install the bump knob by turning clockwise. Tighten securely.
15. Grasp the ends and pull firmly to release the line from the holding slots in the reel.
INSTALLING A PREWOUND REEL
1. Hold the outer spool with one hand and unscrew the bump knob counterclockwise (Fig. 9). 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. 10).
3. Remove the spring from the old inner reel (Fig. 10).
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 the ends of the line through the eyelets in the outer spool (Fig. 16).
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
Removing the Air Filter/Muffler Cover
1. Place the blue choke lever in Position 2 (Fig. 17).
NOTE:
The blue choke lever must be in Position 2 to remove the air filter/ muffler cover.
2. Remove the four (4) screws securing the air filter/muffler cover (Fig. 17). Use a
T-20 Torx bit screwdriver.
3. Pull the cover from the engine. Do not force.
Cleaning the Air Filter
Clean and re-oil 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. Remove air filter/muffler cover. Refer to
Removing the Air Filter/Muffler Cover.
2. Turn cover over and look inside to locate the
air filter. Remove the air filter from inside the
air filter/muffler cover (Fig. 18).
3. Wash the filter in detergent and water (Fig. 19).
Rinse the filter thoroughly. Squeeze out excess
water. Allow it to dry completely.
4. Apply enough clean SAE 30 oil to lightly coat
the filter (Fig. 20).
5. Squeeze the filter to spread and remove
excess oil (Fig. 21).
6. Replace the air filter inside the air filter/muffler cover (Fig. 18).
NOTE: Operating the unit without the air filter and air filter/muffler cover assembly will VOID the warranty.
Reinstalling the Air Filter/Muffler Cover
1. Place the air filter/muffler cover over the back of the carburetor and muffler. Align the screw holes.
2. Insert the four (4) screws into the holes in the air filter/muffler cover (Fig. 17) and tighten. Do not over tighten.
SPARK ARRESTOR MAINTENANCE
1. Remove air filter/muffler cover. Refer to Removing the Air Filter/Muffler Cover.
2. Locate the muffler, but do not remove it. Find the screw on the bottom of the muffler (Fig. 22). Remove the screw
using either a torx #20 or flat blade screwdriver.
3. Carefully pry up the left side spark arrestor hood. Two tabs act as hinges on the
right side of the hood. Flip open the spark arrestor hood like a door and then
pull its tabs out of the muffler slots.
4. Using a small flat blade screwdriver, carefully pry the spark arrestor screen out
from the inside of the spark arrestor hood.
5. Clean the spark arrestor screen with a wire brush. Replace it if it is damaged, or
if unable to clean it thoroughly.
6. Reinstall the spark arrestor screen snugly back into the spark arrestor hood.
7. Reinstall the two hood tabs into the two muffler slots and flip the spark arrestor hood closed.
8. Replace the screw removed in Step 2 and tighten it securely.
9. Reinstall the air filter/muffler cover.
CARBURETOR ADJUSTMENT
The idle speed of the engine is adjustable through the air filter/muffler cover (Fig. 23).
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
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 let it run at a high idle for a 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
hole in the air filter/muffler cover (Fig. 23). Turn the idle speed screw in, 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
REPLACING THE SPARK PLUG
Use replacement #791-610311B, a Champion RDJ7Y 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.
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. 24).
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
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 60 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.
Fig. 19
Fig. 20
WARNING: The cutting head will spin during idle speed adjustments. Wear protective clothing and
observe all safety instructions to prevent serious personal injury.
Air Filter
Inside Muffler Cover
Fig. 18
Fig. 21
Slots
Spark
Arrestor
Hood
Screw
Fig. 22
Tab s Spark Arrestor
Screen
Engine
Muffler
Idle Speed Screw
Fig. 23
0.025 in.
(0.635 mm)
Fig. 24
WARNING: Do not sand blast, scrape or clean electrodes. Grit in
the engine could damage the cylinder.
WARNING: To avoid serious personal injury, always turn the unit
off and allow it to cool before cleaning or servicing it.
CAUSE ACTION
On/Off control in the OFF position
Check to make sure the ON/Off control is in the ON position.
Empty fuel tank Fill fuel tank with properly mixed fuel
Primer bulb wasn't pressed enough Press primer bulb fully and slowly 10 times
Engine is flooded With blue choke lever in position 3, squeeze the trigger
and pull the starter rope
Old or improperly mixed fuel Drain fuel tank and add fresh fuel mixture
Fouled spark plug Replace or clean the spark plug
Plugged spark arrestor Clean or replace spark arrestor
CAUSE ACTION
Air filter is plugged Replace or clean the air filter
Old or improperly mixed fuel Drain fuel tank and add fresh fuel mixture
Improper carburetor adjustment Adjust according to the Carburetor Adjustments
section
CAUSE ACTION
Old or improperly mixed fuel Drain fuel tank and add fresh fuel mixture
Cutting head bound with grass Stop the engine and clean the cutting head
Dirty air filter Clean or replace the air filter
Plugged spark arrestor Clean or replace spark arrestor
TROUBLESHOOTING
ENGINE*
DRIVE SHAFT & CUTTING HEAD*
Engine Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Air-Cooled, 2-Cycle
Stroke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.25 in. (31.75 mm)
Displacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.9 cu in. (31 cc)
Operating RPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6,800+ rpm
Idle Speed RPM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2,600 – 3,600 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Spring-Assist Starting™ Auto Rewind
Muffler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Baffled with Guard
Throttle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Manual Spring Return
Fuel Tank Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 fl.oz. (384 ml)
Drive Shaft Housing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Steel Tube
Throttle Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Finger-Tip Trigger
Total Approximate Unit Weight (without fuel) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 lbs. (5.9 kg)
Cutting Mechanisms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Bump Head™
Shoulder Strap. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Optional
Line Spool Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 in. (76.2 mm)
Trimming Line Diameter. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.080 in. (2.03 mm)
Cutting Path Diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 in. (43.18 cm)
SPECIFICATIONS
CAUSE ACTION
Old or improperly mixed fuel Drain fuel tank and add fresh fuel mixture
Fouled spark plug Replace or clean the spark plug
Plugged spark arrestor Clean or replace spark arrestor
CAUSE ACTION
Cutting head bound with grass Stop the engine and clean cutting head
Cutting head out of line Refill with new line
Inner reel bound up Rewind the inner reel
Cutting head dirty Clean inner reel and outer spool
Line welded Disassemble, remove the welded section and rewind
Line twisted when refilled Disassemble and rewind the line
Not enough line is exposed Push the bump knob and pull out line until 4 inches
(102 mm) of line is outside of the cutting head
CAUSE ACTION
Oil, cleaner or lubricant in cutting head Clean and thoroughly dry the cutting head
If further assistance is required, contact an authorized service dealer.
Loop
Fig. 12
Fig. 13
Loop
Fig. 14
Indexing Teeth
Fig. 11
Index Teeth
Fig. 15
Spring
Fig. 16
Eyelets
Choke
Lever
Screws
Position 2
Fig. 17
Screws
WARNING: If the spark arrestor hood and spark arrestor screen are not tightened securely, they
could fall off causing damage to the unit and possible serious personal injury.
WARNING: To avoid serious personal injury, always turn the unit off and allow it to cool before
cleaning or servicing it.
MAINTENANCE AND REPAIR INSTRUCTIONS MAINTENANCE AND REPAIR INSTRUCTIONS
ENGINE WILL NOT START
ENGINE WILL NOT IDLE
ENGINE WILL NOT ACCELERATE
ENGINE LACKS POWER OR STALLS WHEN CUTTING
CUTTING LINE ADVANCES UNCONTROLLABLY
CUTTING HEAD WILL NOT ADVANCE LINE
*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.