Husqvarna 125 B Manual

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115491326 Rev. 2 4/30/12
FUEL HANDLING
Fuel mixtureCAUTION! The machine is equipped with
a two-- stroke engine and must always be
run using a mixture of gasoline and two--
stroke engine oil. It is important to accu-
rately measure the amount of oil to be
mixed to ensure that the correct mixture is
obtained. When mixing small amounts of
fuel, even small inaccuracies can drastical-
ly affect the ratio of the mixture.
Gasoline
CAUTION! Always use high quality
unleaded gasoline.
S This engine is certified to operate on
unleaded gasoline.
S The lowest recommended octane rating
is 87. If you run the engine on lower oc-
tane rating than 87, “knocking” can oc-
cur. This leads to an increased engine
temperature, which can result in a seri-
ous engine breakdown.
S When working at continuous high revs a
higher octane rating is recommended.
Tw o -- s t r o k e o i lSFor great results and performance use
HUSQVARNA two-- stroke oil, which is
specially formulated for our two-- stroke
engines. Mixture 1:50 (2%).
S To maximize the life of your blower, you
may choose to use a high quality syn-
thetic oil formulated for two-- stroke
engines. Mixture 1:50 (2%).
S Never use two-- stroke oil intended for
water-- cooled outboard engines,
sometimes referred to as outboard oil.
S Never use oil intended for four-- stroke
engines.
WARNING:Always ensure
there is adequate ventilation when
handling fuel.
U.S. gallon U.S. fl. oz.
121/2
2 1/2 6 1/2
5127/8 Gasoline
Tw o -- s t r o k e o i l
2% (1:50) S
Always start byfilling halfthe amount ofthe gasoline to be used. Then add the
entire amount of oil. Mix (shake) the fuel
mixture. Add the remaining amount of
gasoline.
S Mix (shake) the fuel mixture thoroughly
before filling the machine’s fuel tank.
S Do not mix more than one month’s sup-
ply of fuel at a time.
S If the machine is not used for some time,
the fuel tank should be emptied and
cleaned.
WARNING:The catalytic con-
verter muffler gets very hot during
and after use. This also applies
during idling. Be aware of the fire
hazard, especially when working
near flammable substances and/or
vapors.
Fueling
WARNING:Taking the following
precautions, will lessen the risk of
fire:
Do not smoke or place hot objects
near fuel.
Always shut off the engine before
refueling.
Always stop the engine and let it
cool for a few minutes before
refueling.
When refueling, open the fuel cap
slowly so that any excess pressure
is released gently.
Tighten the fuel cap carefully after
refueling.
Always move the machine away
from the refueling area before
starting.
MixingS Always mix the gasoline and oil in a
clean container intended for fuel. 
						

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115491326 Rev. 2 4/30/12
STARTING AND STOPPING
Variable speed control: Push variable
speed control fully counterclockwise.
Starting: Hold the body of the machine on
the ground using your left hand
( CAUTION! Not with your foot!).
Firmly grip the starter rope handle with
your right hand. DO NOT squeeze
throttle trigger. Slowly pull out the cord
until you feel some resistance (the starter
pawls grip); then quickly and powerfully
pull the cord.
Pull starter handle until engine attempts to
run, but no more than 3 pulls. Move choke
to ½ position and pull the cord until the en-
gine starts and runs. Allow the engine to
warm up for approximately 10 seconds;
then, move the choke to the OFF CHOKE
(opened) position.
NOTE:If engine dies, return blue engine
choke lever to the closed position and
repeat starting steps.
WARNING:Never wrap the starter
cord around your hand.
Warm engineWith a warm engine, squeeze and hold the
throttle trigger. Move choke to ½position.
Pull starter rope sharply while squeezing
throttle trigger until engine runs. Move the
choke to the OFF CHOKE (opened)
position.
StoppingTo stop the engine, push and release the
engine STOP switch (S). The switch will
automatically return to the ON position.
Wait 7 seconds before attempting to restart
unit to allow switch to reset.
Starting and stopping
Cold enginePrimer bulb: Press the primer bulb 10
times until fuel begins to fill the bulb. The
primer bulb need not be completely filled.
Choke: Move the blue engine choke lever
over to the FULL CHOKE (closed) position.
CAUTION! Do not pull the starter cord all
the way out and do not let go of the starter
handle when the cord is fully extended.
This can damage the machine.
WARNING:Never start the blower
if the inlet cover is not closed, is
damaged or cannot be closed
(except if the vacuum tube is fitted).
S
S Clean the area around the fuel cap.
Contamination in the tank can cause
operating problems.
S Ensure that the fuel is well mixed by shak -
ing the container before filling the tank. Min. 10 ft.
(3 m) 
						

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115491326 Rev. 2 4/30/12
USING THE BLOWER
125BVX--SERIEScan be used with a shoul-
der strap for extra comfort. The strap
should be worn over the shoulder as
shown.
To blow away debris on the
ground
Fitting the blower tube and nozzle
on the blower
The blower tube (T) has a pegged slot
mounting system to the unit. To install or
remove the blower tube (or collection bag
tube for 125BV
X--SERIES), the tube clamp
bolt must be removed. Align slot in the
blower air outlet with the raised rib on the
tube and insert tube until the holes in the
tube and housing align. Re-- insert the tube
clamp bolt and tighten.
The nozzles (U) have a bayonet mount for
connection to the blower tube. Air is chan-
neled through the blower tube to the
nozzles, where the air discharge velocity
increases and the air stream discharge pat-
tern is formed to provide best performance.
The length of the blower tube can be ad-
justed by twisting the nozzle to the left to
disengage the bayonet mount and sliding
the nozzle to the appropriate position.
Twist the nozzle to the right until a click is
felt to re-- secure the nozzle.
BlowingBefore you begin blowing, put on the re-
quired safety equipment.
WARNING:When fitting the blow -
er tube and nozzle, the engine must
be switched off.
U
T
WARNING:When working with
the blower, wear the required per-
sonal safety equipment:
1. Hearing protection.
2. Eye protection.
3. Protective gloves.
4. Face mask in dusty environments.WARNING:Never point the blower
nozzle at people or animals. The
high -- velocity air stream can contain
particles that may cause serious
injury, especially if the blower has
previously been used for vacuuming.
Be careful, particularly if left hand
operation is applied. Avoid any di -
rect body contact with inlet cover
area. Keep jewelry, loose clothing,
or clothing with loosely hanging
straps, ties, tassels, etc., away from
inlet cover area. 
						

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115491326 Rev. 2 4/30/12
USING THE BLOWER
1. Open the collection bag. Insert the
collection bag tube from inside the bag to
fit in the vacuum inlet opening of the bag
as shown. Ensure elastic is seated in
groove. Close the zipper on the bag.
2. Remove the blower tube and install the collection bag tube. Install and tighten
tube clamp bolt. Attach the carrying strap
to the collection bag loops.
3. Align arrows on lower vacuum tube and
upper vacuum tube. Push lower vacuum
tube into upper vacuum tube until the lower
tube is securely seated in the upper tube
(about 3 inches/7 cm). Permanently as -
semble the two tubes together with the
supplied screw.
4. Open the cover on the side of the blower by using a screwdriver to pry up under the
edge of the cover on the side opposite the
hinge (indicated by arrow on inlet cover).
5. Press the vacuum tubes in the large
opening at the underside of the blower
and align the tabs with the slots in the
tube. Turn it until the bayonet mount
locks (lock symbols align).
Start the blower as described in the Starting
and Stopping section. Work according to the
following instructions:
1. Never blow air toward fixed objects such
as walls, large rocks, automobiles and
fences.
2. When working inside corners, blow from
the corner and inward toward the center of
the work area. Otherwise, debris can fly
up in your face and cause eye injury.
3. Never point the blower nozzle at delicate
plants.
Standard nozzleThe standard nozzle (V) is included with
the 125B, 125BX-- SERIESand 125BVX--SE -
RIES. When greater accuracy and high air
stream concentration is desired, use the
standard nozzle.
High -- velocity nozzleThe high-- velocity nozzle (W) is an acces-
sory of the blower (included with the
125B
X-- SERIESand 125BVX-- SERIES).
When a wider air stream and greater air
velocity is desired, use the high-- velocity
nozzle.
To vacuum debris from the
ground (125B
X--SERIESand
125BV
X--SERIES)
Fitting the collection bag with the
various vacuum tubes
The vacuuming device is an accessory (in-
cluded with the 125BVX-- SERIES).
W
WARNING:When fitting the
tubes to the blower, the engine
must be switched off.
WARNING:Never start the blower
if the inlet cover is not closed, is
damaged or cannot be closed
(except if the vacuum tube is fitted).
WARNING:Do not operate the
blower while standing on a ladder or
a stand.
V 
						

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115491326 Rev. 2 4/30/12
USING THE BLOWER
When operating the blower, the collection
bag must be supported by the shoulder
strap. The strap should be worn over the
shoulder as shown.
WARNING:Always check that
the collection bag is intact and the
zipper is closed before starting the
blower. Never use a damaged bag.
There is risk of injury due to flying
debris. Be careful, particularly if left
hand operation is applied. Avoid any
direct body contact with the ex-
haust outlet area.
WARNING:Never start the blower
if the inlet cover is not closed, is
damaged or cannot be closed
(except if the vacuum tube is fitted).
WARNING:Do not operate the
blower while standing on a ladder or
a stand.
Start the blower as described in the Starting
and Stopping section. Work according to the
following instructions:
1. Do not vacuum large solid objects that can damage the fan, such as wood, cans
(tins) or lengths of string or ribbon.
2. Do not let the vacuum tube strike the
ground.
3. The collection bag can be emptied by first
stopping the unit and then opening the zip-
per on the side.
VacuumingBefore vacuuming, put on the required
safety equipment.
WARNING:When working with
the blower, wear the required per-
sonal safety equipment:
1. Hearing protection.
2. Eye protection.
3. Protective gloves.
4. Face mask in dusty environments. 
						

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115491326 Rev. 2 4/30/12
MAINTENANCE
Muffler
Some mufflers are fitted with catalytic con-
verters. See the Technical data section to
find out if your machine is equipped with a
catalytic converter.
The muffler is designed to dampen the
noise level and to direct the exhaust fumes
away from the user. The exhaust fumes
are hot and can contain sparks, which can
result in fire if the exhaust fumes are
directed towards a dry and flammable
material.
Some mufflers are equipped with a special
spark arresting screen (CC). If your ma-
chine is fitted with this type of screen, it
should be cleaned regularly. To access the
screen, remove the outlet cover on the
front of the muffler. Use a wire brush to
clean the screen. On mufflers without a
catalytic converter the screen should be
cleaned weekly, or replaced if necessary.
On mufflers fitted with a catalytic converter
the screen should be checked and cleaned
monthly. If the screen is damaged it
should be replaced. If the screen is fre-
quently blocked, this can be a sign that the
function of the catalytic converter is im-
paired. Contact your dealer to inspect the
muffler. A blocked screen will cause the
engine to overheat resulting in damage to
the cylinder and piston.
CarburetorYour Husqvarna product has been designed
and manufactured to specifications that re-
duce harmful emissions. After the engine
has used 8-- 10 tanks of fuel, the engine will
be run-- in. To ensure that it continues to run
at peak performance and to minimize harm-
ful exhaust emissions after the run-- in peri-
od, ask your authorized service dealer to
adjust your carburetor.
Function
S The carburetor governs the engine’s
speed via the throttle control. Air and fuel
are mixed in the carburetor.
S The T-- screw (BB) regulates the throttle
setting at idle speed. If the T-- screw is
turned clockwise this gives a higher idle
speed; turning it counterclockwise gives a
lower idle speed.
Basic settingSThe basic carburetor settings are ad-
justed during testing at the factory. Fine
adjustment should be carried out by a
skilled technician.
Recommended idle speed:
See “Technical data” section.
Recommended max. speed:
See “Technical data” section.
Fine adjustment of the idle speed -- TAdjust the idle speed using the idle adjust-
ment T-- screw if it is necessary to readjust.
The idle speed is correctly adjusted when
the engine will run smoothly in every posi-
tion.
BB
CAUTION! Never use a machine that has
a faulty or loose muffler. Ensure the muffler
bolts are tight.
Maintenance SafetyThe owner is responsible for the perfor-
mance of all required maintenance as
defined in the operator’s manual.
Disconnect the spark plug before perform-
ing maintenance, except carburetor adjust-
ments.
WARNING:Improper mainte -
nance could result in serious engine
damage or in serious injury. 
						

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115491326 Rev. 2 4/30/12
MAINTENANCE
Air filter
The air filter (GG) must be regularly cleaned
to remove dust and dirt in order to avoid:
S Carburetor malfunctions
S Starting problems
S Loss of engine power
S Unnecessary wear to engine parts
S Excessive fuel consumption
S Elevated content of harmful exhaust
fumes.
Clean the filter every 25 hours, or more
regularly if conditions are exceptionally
dusty.
Cleaning the air filterRemove the air filter cover (HH) and take out
the filter. Wash it clean in warm, soapy water.
Rinse thoroughly. Ensure that the filter is dry
before reinstalling it.
An air filter that has been in use for a long
time cannot be cleaned completely. The
filter must therefore be replaced with a new
one at regular intervals.
CAUTION! A damaged air filter must
always be replaced.
Cooling system
The engine is equipped with a cooling
system for m aintaining the right operating
temperature.
The cooling system consists of the follow-
ing components:
1. Air intake on the starter device (DD).
2. Fan blades on the flywheel (EE).
3. Cooling fins on the cylinder (FF).
4. Cylinder cowling (guides cooling air flow
against cylinder surfaces).
Clean the cooling system by brushing once
a week, or more often, if necessary.
A dirty or blocked cooling system will
cause the blower to overheat and this will
damage the cylinder and piston.
WARNING:Mufflers fitted with
catalytic converters get very hot
duringuseandremainsoforsome
time after stopping. This also ap-
plies at idle speed. Contact can re -
sult in burns to the skin. Remember
theriskoffire!
WARNING:The inside of the
muffler contain chemicals that may
be carcinogenic. Avoid contact with
these elements in the event of a
damaged muffler.
WARNING:Bear in mind that:
Engine exhaust fumes contain car -
bon monoxide, which can cause
carbon monoxide poisoning. For
this reason you should not start or
run the machine indoors, or any -
where that is poorly ventilated.
The exhaust fumes from the engine
are hot and may contain sparks
which can start a fire. Never start
the machine indoors or near flam-
mable material!
CC
DD
EE FF
GGHH 
						

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115491326 Rev. 2 4/30/12
MAINTENANCE
Sparkplug
The spark plug condition is influenced by:
S Incorrect carburetor adjustment.
S An incorrect fuel mixture (too much or in-
correct type of oil).
S Poor quality gasoline and/or oil
S A dirty air filter.
These factors cause deposits on the spark
plug electrodes, which may result in operat-
ing problems and starting difficulties.
If the machine is low on power, difficult to
start or runs poorly at idle speed: always
check the spark plug first before taking
any further action. If the spark plug is dirty,
clean it and check that the electrode gap is
0.024″ (0.6 mm). The spark plug should be
replaced after about a month in operation or
earlier if necessary.
0.024″(0.6 mm)
CAUTION! Always use the recommended
spark plug type! Use of the wrong spark
plug can damage the piston/cylinder.
Maintenance scheduleBelow you will find some general mainte-
nance instructions.
Daily maintenanceS Clean the exterior surfaces of the blower.
S Check that the variable speed control and
the throttle trigger function in a safe man-
ner. Replace damaged parts.
S Check that the stop switch works proper-
ly. Replace if necessary.
S Clean the air filter. Replace if necessary.
S 125B
X-- SERIESand 125BVX-- SERIES:
Check that the inlet cover can be locked
in the closed position. Carefully check
that the fan impeller is clean, especially if
the blower has been used for collecting
debris (vacuuming).
S Check that all nuts and screws are prop-
erly tightened.
S Check that all the housings are free of
cracks. Replace damaged parts.
S 125B
X-- SERIESand 125BVX-- SERIES:
Check that the collection bag is intact and
that the zipper works. Replace it if neces-
sary.
Weekly maintenanceS Check the condition of the starter device,
the starter cord and the tensioning spring.
Replace damaged parts.
S Check the condition of the air intake at
the starter device. Remove debris if it is
clogged.
S Clean the outside of the spark plug. Re-
move it and check the electrode gap. Ad-
just the gap to 0.024 ″(0.6 mm), or
replace the spark plug. Use resistor spark
plug Champion RCJ -- 8Y or equivalent.
S Clean the fan blades on the flywheel.
S Clean or replace the spark arresting
screen (not on mufflers with a catalytic
converter).
S Clean the carburetor area.
S Clean the air filter.
Monthly maintenanceSClean the fuel tank.
S Clean the outside of the carburetor and
the area around it.
S Clean the fan blades on the flywheel and
the area around it.
S Check fuel lines for cracks or other dam-
age. Change if necessary.
S Change the fuel filter in fuel tank.
S Check all cables and connections. Re-
place damaged parts.
S Replace the spark plug. Use spark plug
Champion RCJ -- 8Y or equivalent.
S Change the air filter. 
						

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STORAGE
Storage
S Allow engine to cool, and secure the unit
before storing or transporting.
S Store unit and fuel in a well ventilated area
where fuel vapors cannot reach sparks or
open flames from water heaters, electric
motors or switches, furnaces, etc.
S Store unit with all guards in place. Posi-
tion unit so that any sharp object cannot
accidentally cause injury.
S Store unit and fuel well out of the reach of
children.
Seasonal storagePrepare unit for storage at end of season or
if it will not be used for 30 days or more.
If your unit is to be stored for a period of
time:
SClean the entire unit before lengthy stor-
age.
S Store in a clean dry area.
S Lightly oil external metal surfaces.
Fuel systemEmpty the fuel system before storage for
30 days or longer. Drain the fuel tank, start
the engine and let it fun until the fuel lines
and carburetor are empty. Use fresh fuel next
season.
Under GASOLINE in the FUEL HANDLING
section of this manual, see information
regarding the use of proper fuel in your
engine. Fuel stabilizer is an acceptable alter-
native in minimizing the formation of fuel gum
deposits during storage. Add stabilizer to gas -
oline in fuel tank or fuel storage container.
Follow the mix instructions found on stabilizer
container. Run engine at least 5 minutes after
adding stabilizer. CAUTION! Perform the folowing steps
after each use.
EngineS Remove spark plug and pour 1 teaspoon
of 1:50, 2-cycle engine oil (air cooled)
through the spark plug opening. Slowly
pull the starter rope 8 to 10 times to
distribute oil.
S Replace spark plug with new one of rec-
ommended type and heat range.
S Clean air filter.
S Check entire unit for loose screws, nuts,
and bolts. Replace any damaged, broken,
or worn parts.
S At the beginning of the next season, use
only fresh fuel having the proper gasoline
to oil ratio.
OtherSDo not store gasoline from one season to
another.
S Replace your gasoline can if it starts to
rust. 
						

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TROUBLESHOOTING
TROUBLE
CAUSE REMEDY
Engine will not
start.1. Engine flooded.
2. Fuel tank empty.
3. Spark plug not firing.
4. Fuel not reaching
carburetor.
5. Compression low. 1. See “Starting a Warm Engine”
in STARTING AND STOPPING section.
2. Fill tank with correct fuel mixture.
3. Install new spark plug.
4. Check for dirty fuel filter; replace. Check for kinked or split fuel line;
repair or replace.
5. Contact an authorized service dealer.
Engine will not
idle properly. 1. Fuel not reaching
carburetor.
2. Carburetor requires adjustment.
3. Crankshaft seals worn.
4. Compression low. 1. Check for dirty fuel filter; replace.
Check for kinked or split fuel line;
repair or replace.
2. See “Fine Adjustment of the Idle Speed-- T” in MAINTENANCE section.
3. Contact an authorized service dealer
4. Contact an authorized service dealer.
1. Air filter dirty.
2. Fuel not reaching carburetor.
3. Spark plug fouled.
4. Carburetor requires adjustment.
5. Carbon build up.
6. Compression low.
Engine will not
accelerate,
lacks power, or
dies under a
load.
1. Clean or replace air filter.
2. Check for dirty fuel filter; replace.
Check for kinked or split fuel line;
repair or replace.
3. Clean or replace spark plug and re-gap.
4. Contact an authorized service dealer.
5. Contact an authorized service dealer.
6. Contact an authorized service dealer.
Engine smokes
excessively. 1. Choke partially on.
2. Fuel mixture incorrect.
3. Air filter dirty.
4. Carburetor requires
adjustment. 1. Adjust choke.
2. Empty fuel tank and refill with
correct fuel mixture.
3. Clean or replace air filter.
4. Contact an authorized service dealer.
Engine runs hot. 1. Fuel mixture incorrect.
2. Spark plug incorrect.
3. Carburetor requires
adjustment.
4. Carbon build up. 1. See “Fuel mixture” in FUEL HANDLING
section.
2. Replace with correct spark plug.
3. Contact an authorized service dealer.
4. Contact an authorized service dealer.
Troubleshooting table
WARNING:Always stop unit and disconnect spark plug before performing any of the
recommended remedies below other than remedies that require operation of the unit.