MAINTENANCE AND REPAIR INSTRUCTIONS
Reinstalling the Air Filter/Muffler Cover
Checking the fuel
Idle Speed Screw
1.
Place the air filter/muffler cover over the back of the carburetor
and muffler. Align the screw holes.
mixture, cleaning the air
filter, and adjusting the
idle speed should solve
most engine problems. If
not and all of the
2.
Insert the four (4) screws into the holes in the air filter/muffler
cover (Fig. 21) and tighten. Do not over tighten.
SPARK ARRESTOR MAINTENANCE
following are true:
1.
Remove air filter/muffler cover. Refer to Removing the Air
•
the engine will not idle
Filter/Muffler Cover.
Spark Arrestor
Hood
Engine
• the engine hesitates
2.
Locate the muffler,
but do not remove it.
Find the screw on
the bottom of the
muffler (Fig. 26).
Slots
Fig. 27
or stalls on
acceleration
• there is a loss of engine power
Have the carburetor adjusted by an authorized service dealer.
Remove the screw
using either a torx
REPLACING THE SPARK PLUG
WARNING:
To prevent serious personal injury, make
sure the cutting attachment has stopped rotating after you
turn it off and before you set it down.
#20
or flat blade
Spark Arrestor
Screen
Fig. 26
screwdriver.
Carefully pry up the
left side spark
Screw
Tabs
Muffler
3.
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.
Using a small flat blade screwdriver, carefully pry the spark
arrestor screen out from the inside of the spark arrestor hood.
Clean the spark arrestor screen with a wire brush. Replace it if it is
damaged, or if you are unable to clean it thoroughly.
Reinstall the spark arrestor screen snugly back into the spark arrestor
hood.
Reinstall the two hood tabs into the two muffler slots and flip
the spark arrestor hood closed.
Use 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.
4.
5.
6.
7.
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.
WARNING:
Do not sand blast, scrape or clean
electrodes. Grit in the engine could damage the
cylinder.
8.
9.
CARBURETOR ADJUSTMENT
Replace the screw you removed in Step 2 and tighten it securely.
Reinstall the air filter/muffler cover.
3.
4.
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).
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.
Install a correctly-
gapped spark plug in
the cylinder head.
Tighten by turning the
5/8-inch socket
0.025 in.
(0.635 mm)
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.
Fig. 28
clockwise until snug.
If using a torque wrench torque to:
110-120
in.•lb. (12.3-13.5 N•m)
CHECK FUEL MIXTURE
Do not over tighten.
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.
CLEANING
WARNING:
To avoid serious personal injury, always
turn your trimmer off and allow it to cool before you
clean or service it.
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.
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.
ADJUST IDLE SPEED SCREW
If, after checking the fuel mixture and cleaning the air filter, the engine
STORAGE
• Never store a fueled unit where fumes may reach an open flame
or spark.
still will not idle, adjust the idle speed screw as follows:
1.
2.
Start the engine and let it run at a high idle for a minute to warm
up. Refer to Starting/Stopping Instructions.
• 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.
WARNING:
The cutting attachment will spin during
idle speed adjustments. Wear protective clothing and
observe all safety instructions to prevent serious personal
injury.
LONG TERM STORAGE
If you plan on storing the unit for an extended time, use the following
storage procedure:
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.
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.
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.
8
| Categories | Bolens Trimmer Manuals, Lawn Mower Manual, MTD Lawn Mower Manuals, MTD Trimmer Manuals, Trimmer Manuals |
|---|---|
| Tags | Bolens BL100, Bolens BL150, MTD BL100 MTD BL150 |
| Download File |
|
| Document Type | Owner's Manual |
| Language | English |
| Product Brand | MTD, Lawn Mower |
| Product Type | Walk Behind Mower |
| Document File Type | |
| Publisher | mtdproducts.com |
| Wikipedia's Page | MTD Products |
| Copyright | Attribution Non-commercial |
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