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HOLDING THE TRIMMER
WARNING:
Always wear eye, hearing, foot and body protection to reduce the risk of injury when operating this unit.
Before operating the unit, stand in the operating position (Fig. 9). Check for the following:
• The operator is wearing eye protection and proper clothing
• With a slightly-bent right arm, the operator's right hand is holding the shaft grip
• The operator's left arm is straight, the left hand holding the D-handle
• The unit is at waist level
• The cutting head is parallel to the ground and easily contacts the grass without the need to bend
over
ADJUSTING TRIMMING LINE LENGTH
CAUTION:
Do not remove or alter the line cutting blade assembly.
Excessive line length will make the unit overheat. This may lead to serious
personal injury or damage to the unit.
The Bump Head™ cutting head allows you to release trimming line without stopping the
engine. To release more line, lightly tap the cutting head on the ground (Fig. 10) while
operating the trimmer at high speed.
NOTE: Always keep the trimming line fully extended. Line release becomes more difficult
as cutting line becomes shorter
Each time the head is bumped, about 1 inch (25.4 mm) of trimming line releases. A blade in
the cutting head shield will cut the line to the proper length if any excess line is released.
For best results, tap the bump knob on bare ground or hard soil. If you attempt a line
release in tall grass, the engine may stall.
NOTE: Do not rest the Bump Head™ on the ground while the unit is running.
MAINTENANCE SCHEDULE
Perform these required maintenance procedures at the frequency stated in the table. These procedures should also be a part of any
seasonal tune-up.
NOTE: Some maintenance procedures may require special tools or skills. If you are unsure about these procedures take your unit to any
non-road engine repair establishment, individual or authorized service dealer.
NOTE: Maintenance, replacement, or repair of the emission control devices and system may be performed by any non-road engine repair
establishment, individual or authorized service dealer.
WARNING:
To prevent serious injury, never perform maintenance or repairs with unit running. Always service and repair a cool
unit. Disconnect the spark plug wire to ensure that the unit cannot start.
In order to assure peak performance of your engine, inspection of the engine exhaust port may be necessary after 50 hours of operation. If you
notice lost RPM, poor performance or general lack of acceleration, this service may be required. If you feel your engine is in need of this inspection,
refer service to any non-road engine repair establishment, individual or authorized service dealer for repair. DO NOT attempt to perform this process
yourself as engine damage may result from contaminants involved in the cleaning process for the port.
FREQUENCY
Before starting engine
Fill fuel tank with fresh fuel
Every 10 hours
Clean and re-oil air filter
Every 25 hours
Check and clean spark arrestor
Check spark plug condition and gap
Every 50 hours
Inspect exhaust port and spark arrestor screen for clogging or obstruction to
assure maximum performance levels.
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
Winding 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: SplitLine™ can only be used with the inner reel with the slotted holes. Single line can be
used on either type of inner reel. Use Figure 15 to identify the inner reel you have.
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.
16). 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.
17). Wind the line in the direction indicated on the inner
reel. Place your index finger between the two lines to
stop the lines from overlapping. Do not overlap the
ends of the line. Proceed to step 11.
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. 18). 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. 18).
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. 19).
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. 20). 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. While holding the inner reel and outer spool, 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. 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 the ends of the line through the eyelets in the outer spool (Fig. 20).
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 your unit off and allow it
to cool before you clean or service it.
Removing the Air Filter/Muffler Cover
1. Place the blue choke lever in Position 2 (Fig. 21).
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. 21). Use a T-20 Torx bit
screwdriver.
3. Pull the cover from the engine. Do not force.
4
OPERATING INSTRUCTIONS
BL150
Fig. 9
BL150
Fig. 10
MAINTENANCE AND REPAIR INSTRUCTIONS
MAINTENANCE REQUIRED
Fig. 12
Fig. 13
Indexing Teeth
For Use with
Single Line ONLY
Slotted
Holes
Fig. 14
Fig. 15
Loop
Fig. 16
Fig. 17
Loop
Fig. 18
Fig. 19
Eyelets
Spring
Fig. 20
Blue Choke
Lever
Screws
Fig. 21
Some line breakage will occur from:
• Entanglement with foreign matter
• Normal line fatigue
• Attempting to cut thick, stalky weeds
• Forcing the line into objects such as walls or fence posts
TIPS FOR BEST TRIMMING RESULTS
• Keep the cutting head parallel to the ground.
BL100
• Do not force the cutting head. Allow the tip of the line to do the cutting, especially along walls. Cutting with more than the tip will reduce
cutting efficiency and may overload the engine.
• Cut grass over 8 inches (200 mm) by working from top to bottom in small increments to avoid premature line wear or engine drag.
• Cut from right to left whenever possible. Cutting to the left improves the unit's cutting efficiency. Clippings are thrown away from the
operator.
• Slowly move the trimmer into and out of the cutting area at the desired height. Move either in a forward-backward or side-to-side
motion. Cutting shorter lengths produces the best results.
• Trim only when grass and weeds are dry.
• The life of your cutting line is dependent upon;
• Adherence of the listed trimming techniques
• What vegetation is cut
BL100
• Where vegetation is cut
For example, the line will wear faster when trimming against a foundation wall as opposed to
trimming around a tree.
DECORATIVE TRIMMING
Decorative trimming is accomplished by removing all vegetation around trees, posts,
fences, etc.
Rotate the whole unit so that the cutting head is at a 30° angle to the ground (Fig. 11).
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 your air filter
properly can result in poor performance or can cause
permanent damage to your 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. 22).
3. Wash the filter in detergent and water (Fig. 23). 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. 24).
5. Squeeze the filter to spread and remove excess oil (Fig.
25).
6. Replace the air filter inside the air filter/muffler cover
SEE
(Fig. 22).
NOTE: Operating the unit without the air filter and air
p. 3
filter/muffler cover assembly will VOID the
warranty.
p. 4
Reinstalling the Air Filter/Muffler Cover
p. 4
1. Place the air filter/muffler cover over the back of the
p. 4
carburetor and muffler. Align the screw holes.
2. Insert the four (4) screws into the holes in the air
p. 4
filter/muffler cover (Fig. 21) 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. 26).
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
Bump Knob™
hood. Flip open the spark arrestor hood like a door and then pull its tabs out of the muffler
slots.
Bolt
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 you are 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 you removed in Step 2 and tighten it securely.
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
Outer Spool
serious personal injury.
9. Reinstall the air filter/muffler cover.
CARBURETOR ADJUSTMENT
WARNING:
To prevent serious personal injury, make sure the cutting head has stopped
Spring
rotating after you turn it off and before you set it down.
Inner Reel
The idle speed of the engine is adjustable through the air filter/muffler cover (Fig. 27).
NOTE: Careless adjustments can seriously damage your unit. An authorized service dealer should make carburetor adjustments.
For Use with
Check Fuel Mixture
Splitline™ or
Old and/or improperly mixed fuel is usually the reason for improper unit performance. Drain and refill the tank with fresh, properly-mixed
Single Line ONLY
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 head 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 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. 27). 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
Index Teeth
Have the carburetor adjusted by an authorized service dealer.
REPLACING THE SPARK PLUG
WARNING:
Do not sand blast, scrape or clean electrodes. Grit in the engine
could damage the cylinder.
Use #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. 28).
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 your trimmer off and allow it to cool before you clean or service
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
Position 2
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.
Screws
• 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 you plan 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 trimmer 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.
BL150
BL100
Fig. 11
Air Filter
Inside Muffler Cover
Fig. 22
Fig. 23
Fig. 24
Fig. 25
Slots
Spark
Arrestor
Hood
Screw
Tabs
Fig. 26
Fig. 27
0.025 in.
(0.635 mm)
Fig. 28
Engine
Muffler
Spark Arrestor
Screen
Idle Speed Screw
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