Zenoah HB250 Owner's manual

The engine exhaust from this product
contains chemicals known to the State
of California to cause cancer, birth
defects or other reproductive harm.
WARNING
OWNER/OPERATOR MANUAL
HANDHELD BLOWER
848-L0F-93A0 (503)
HB250
Thank you for purchasing a RedMax
product.
Before using our blower, please read
this manual carefully to understand the
proper use of your unit.
DRIVE UNIT 40900101 and up ENGINE UNIT KU413473 and up
APPLICABLE SERIAL NUMBERS :

Read this manual carefully to understand all
safety precautions, controls, proper operation
and maintenance of your RedMax blower.
Failure to do so could result in serious injury.
Instructions labeled as shown at left concern critical steps or
procedures which must be followed in order to prevent accidents
which could lead to serious bodily injury or death. This mark is
used to indicate instructions which must be followed without
exception.
Instructions labeled as shown at left concern steps or procedures
which, if not followed correctly, could lead to mechanical failure,
breakdown, or damage.
Used to label supplementary instructions designed to provide
hints or directions useful in the use of the product.
WARNING
IMPORTANT
NOTE
SAFETY FIRST
Instructions contained in warnings within this manual and warning seals marked
with a symbol on the blower concern critical points which must be taken into
consideration to prevent possible serious bodily injury, and for this reason you
are requested to read all such instructions carefully and follow them without fail.
Note that there may be times when warning seals peel off or become soiled and
impossible to read. If this happens, you should contact the dealer from which
you purchased the product to order new seals and affix the new seal(s) in the
required location(s).
■ Notes on types of warnings

CONTENTS
SAFETY PRECAUTIONS················································································ 4
OPERATOR
USE OF BLOWER
WORKING CONDITION
AVOID NOISE PROBLEM
AVOID CHANCES OF DAMAGE
SYMBOLS ON THE MACHINE ······································································· 7
PARTS LOCATION & SPECIFICATIONS ······················································· 8
ASSEMBLY······································································································ 8
BLOWER PIPE
FUEL················································································································ 9
RECOMMENDED MIXING RATIO
HOW TO MIX FUEL
FUELING THE UNIT
OPERATION ·································································································· 11
STARTING ENGINE
RESTARTING ENGINE WHILE ENGINE HOT
STOPPING ENGINE
ADJUSTING IDLE SPEED
MAINTENANCE····························································································· 12
MAINTENANCE CHART
AIR CLEANER
FUEL FILTER
SPARK PLUG
MUFFLER
SPARK ARRESTER
AIR INLET SCREEN
PROCEDURES TO BE PERFORMED AFTER EVERY 100 HOURS OF USE
STORAGE ····································································································· 14
TROUBLESHOOTING GUIDE ······································································ 14
PARTS LIST ·································································································· 15

•Read this Blower Owner/Operator
Manual carefully. Be sure you
understand how to operate this unit
properly before you use it. Failure to do
so could result in serious injury.
•Be sure to keep this manual handy so
that you may refer to it later whenever
any questions arise. Also note that you
are requested to contact the dealer from
whom you purchased the product for
assistance the event that you have any
questions which cannot be answered
herein.
•Always be sure to include this manual
when selling, lending, or otherwise
transferring the ownership of this
product.
■OPERATOR
•Refrain from operating the blower if you
are tired, ill, or upset, or if you are under
the influence of alcohol, drugs or
medication.
•Always wear eye protection goggles.
•Always wear ear protectors to protect your
ears from engine noise. If this guideline is
not followed, hearing loss can occur.
Safety Precautions
•Wear a face mask to guard against the
inhalation of dust.
•Wear rubber-soled shoes or shoes with
some other form of anti-slip protection to
help protect you against falling.
•Be sure to wear proper work clothing.
■USE OF BLOWER
•Each time before starting the engine,
inspect the entire unit to see if every part
is in good order and is securely tightened
in place. If any damage is found in the fuel
line, the exhaust line, or the ignition
wiring, do not use the blower until it has
been repaired.
4

•Never use the blower without the
screen at the air intake of the blower.
Before each use, check that, the
screw(1) is securely tightened and is
free from any damage.
•Never remove debris from the intake
screen while the engine is running.
Contact with rotating blower fan may
result in a serious personal injury.
•Do not allow children to use blower. Make
sure that each person you authorize to
operate the blower understands all of the
safety rules in this manual.
•Avoid using any accessory or attachment
other than those bearing the RedMax
mark for use with the blower.
•When suspending a job or inspecting the
blower, be sure to stop engine.
•Drain the fuel from the fuel tank before
transporting or storing the blower.
•When storing the blower, choose a space
indoors free from moisture and out of the
reach of children.
•Examine the blower at intervals for loose
fasteners and rusted or damaged parts.
Use special care around the fuel line,
the muffler, and the ignition wiring.
•All engine service except for those
WARNING
WARNING
Safety Precautions
described in this manual should be
performed by competent service
personnel. Improper service to the blower
fan and muffler could cause a hazardous
failure.
■WORKING CONDITION
•Keep open flames and sparks away from
the area where fuel is handled or stored,
as the fuel is highly flammable.
•Make sure that the engine has cooled
down before refueling.
•Mix and store fuel only in a approved
container.
•Never smoke while refueling the blower.
•Wipe off any spilled fuel and tighten the
fuel cap securely.
•Move at least 3m(10ft) away from the
fueling spot before starting the engine.
•Check the work area that the blower will
be used in and remove or cover all
valuables that may be damaged by the air
blast or thrown debris.
•Avoid running the engine indoors. The
exhaust gases contain harmful carbon
monoxide.
WARNING
5

6
•Keep operation area clear of all persons,
particularly small children and pets. Injury
may result from flying debris.
•Avoid using the blower where stable
footing and balance are not assured.
•Never touch the spark plug or plug cord
while the engine is in operation. Doing so
may result in being subjected to an
electrical shock.
•Never touch the muffler, spark plug, or
other metallic parts of the engine while the
engine is in operation or immediately after
shutting down the engine. These metallic
parts reach high temperatures during
operation and doing so could result in
serious burns.
■AVOID NOISE PROBLEM
Check and follow the local regulations
as to sound level and hours of
operations for blower.
•In general, operate blowers between
8a.m.and 5p.m.on week day and 9a.m.to
5p.m.weekends. Avoid using blower late
at night and/or early in the morning.
•Loosen compacted leaves, grass or debris
with a rake or broom beforehand, so that
the lowest possible throttle setting would
get the job done.
•In dusty conditions, slightly dampen
surfaces.
•Check if the air filter, air intakes and
muffler are working in properly.
•Never use more than one unit of the
blower at one time.
■AVOID CHANCES OF DAMAGE
•Avoid directing the blower nozzle toward
persons, pets, cars, windows or anything
that could be harmed by blowing debris or
dust.
•Keep the nozzle at full extension when
operating so as to make the air stream
close to the ground.
•Collect any trash and leaves and put them
into a proper container after the job is
done.
•Always check to be sure that no debris
has been blown onto someone else’s
property.
NOTE
Safety Precautions

7
Symbols on the machine
CE MOTEUR EST CONFORME A LA REGLEMENTATION U.S. EPA 2005 POUR LES PETITS
MOTEURS HORS-ROUTE. DUREE DE CONFORMITE DES EMISSIONS : CATEGORIE C.
SE REFERER AU MODE D’EMPLOI POUR DE PLUS AMPLES INFORMATIONS.
FAMMILLE DE MOAMMILLE DE MOTEUR :TEUR : 5KZXS.0254VW5KZXS.0254VW;EM;EM
CYLINDREE : 25cm3DATE DE FABRICAABRICATION :TION :
INFORMAINFORMATION IMPORTION IMPORTANTE CONCERNANT LE MOANTE CONCERNANT LE MOTEURTEUR
For safe operation and maintenance,
symbols are carved in relief on the machine.
According to these indications, please be
careful not to make a mistake.
(a) The port to refuel the "MIX GASOLINE"
Position: FUEL TANK CAP
(b) The direction A to close the choke
The direction B to open the choke
Position: AIR CLEANER COVER

Parts Location & Specifications
Assembly
■ BLOWER PIPE
•Align groove in blower pipe with projection
on blower housing (or another blower pipe)
and slide the pipe onto the blower housing
(or another blower pipe).
Rotate the pipe clockwise to lock it into
place.
MODEL HB250
Dimensions ( L x W x H ) mm ( in ) 327 x 273 x 360 (12.9 x 10.7 x 14.2)
Dry Weight (without tube and nozzle) kg ( lbs ) 3.8 (8.3)
Fuel Tank Capacity liter ( fl. oz ) 0.65 (22.0)
Engine Type Air cooled 2-cycle gasoline engine
Piston Displacement cm3( cu. in ) 25.4 (1.60)
Durability Period 50h
Carburetor Walbro Diaphragm type
Ignition System CDI
Spark Plug NGK BPMR7A
Muffler Spark arrester equipped
Operating Engine Speed rpm 2.800 ~ 7.800
Idle Speed rpm 2.800
Max. Air Volume (with std. pipe) cu. m/min ( cfm ) 10.3 (364)
Max. Air Volume (w/o pipe) cu. m/min ( cfm ) 11.1 (392)
Max. Air Velocity m/sec ( mph ) 57 (127)
Noise Level (50 Feet ANSI B175-2) dB (A) 73
8

9
Fuel
■RECOMMENDED MIXING RATIO
GASOLINE 50:OIL 1
•Exhaust emission are controlled by the
fundamental engine parameters and
components(eq., carburation, ignition
timing and port timing) without
addition of any major hardware or the
introduction of an inert material during
combustion.
•These engines are certified to operate on
unleaded gasoline.
•Make sure to use gasoline with a
minimum octane number of 89 RON
(USA/Canada: 87AL)
•If you use a gasoline of a lower octane
value than prescribed, there is a danger
that the engine temperature may rise and
an engine problem such as piston seizing
may consequently occur.
•Unleaded gasoline is recommended to
reduce the contamination of the air for the
sake of your health and the environment.
•Poor quality gasolines or oils may damage
sealing rings, fuel lines or fuel tank of the
engine.
■HOW TO MIX FUEL
Pay attention to agitation.
1. Measure out the quantities of gasoline
and oil to be mixed.
2. Put some of the gasoline into a clean,
approved fuel container.
3. Pour in all of the oil and agitate well.
4. Pour In the rest of gasoline and agitate
IMPORTANT
•Gasoline is very flammable. Avoid
smoking or bringing any flame or
sparks near fuel. Make sure to stop the
engine and allow it cool before
refueling the unit. Select outdoor bare
ground for fueling and move at least
3m (10ft) away from the fueling point
before starting the engine.
•The RedMax engines are lubricated by oil
specially formulated for air-cooled 2-cycle
gasoline engine use. If RedMax oil is not
available, use an anti-oxidant added
quality oil expressly labeled for air-cooled
2-cycle engine use. (JASO FC GRADE
OIL or ISO EGC GRADE)
•Do not use BIA or TCW (2-stroke water-
cooling type) mixed oil.
WARNING
50:1 MIXING CHART
GASOLINE gal. 1 2 3 4 5
2-CYCLE OIL fl.oz 2.6 5.2 7.8 10.4 13
GASOLINE liter 1 2 3 4 5
2-CYCLE OIL ml 20 40 60 80 100

10 
Fuel
again for at least one minute. As some
oils may be difficult to agitate depending
on oil ingredients, sufficient agitation is
necessary for the engine to last long. Be
careful that, if the agitation is insufficient,
there is an increased danger of early
piston seizing due to abnormally lean
mixture.
5. Put a clear indication on the outside of the
container to avoid mixing up with gasoline
or other containers.
6. Indicate the contents on outside of
container for easy identification.
■FUELING THE UNIT
1. Untwist and remove the fuel cap. Rest the
cap on a dustless place.
2. Put fuel into the fuel tank to 80% of the full
capacity.
3. Fasten the fuel cap securely and wipe up
any fuel spillage around the unit.
1. Select bare ground for fueling.
2. Move at least 10feet (3meters) away from
the fueling point before starting the
engine.
3. Stop the engine before refueling the unit.
At that time, be sure to sufficiently agitate
the mixed gasoline in the container.
FOR YOUR ENGINE LIFE, AVOID;
1. FUEL WITH NO OIL(RAW GASOLINE) –
It will cause severe damage to the internal
engine parts very quickly.
2. GASOHOL – It can cause deterioration of
rubber and/or plastic parts and disruption
of engine lubrication.
3. OIL FOR 4-CYCLE ENGINE USE – It can
cause spark plug fouling, exhaust port
blocking, or piston ring sticking.
4. Mixed fuels which have been left
unused for a period of one month or
more may clog the carburetor and result
in the engine failing to operate properly.
5. In the case of storing the product for a
WARNING
long period of time, clean the fuel tank
after rendering it empty. Next, activate the
engine and empty the carburetor of the
composite fuel.
6. In the case of scrapping the used mixed
oil container, scrap it only at an authorized
repository site.
As lot details of quality assurance, read the
description in the section Limited Warranty
carefully. Moreover, normal wear and
change in product with no functional
influence are not covered by the warranty.
Also, be careful that, if the usage in the
instruction manual is not observed as to the
mixed gasoline, etc. described therein, it
may not be covered by the warranty.
NOTE