Hypro L-1512 User manual

PowerPro Gasoline Engines
Operation, Repair, and Parts Manual
Form L-1512
(9-07)
PowerPro Model Number 160, 200, 270 and 390
HY160 (5.5 hp) - 2541-0043 (3/4” keyed shaft)
2541-0044 (5/8” threaded shaft)
HY200 (6.5 hp) - 2541-0045 (3/4” keyed shaft)
2541-0046 (5/8” threaded shaft)
HY270 (9.0 hp) - 2541-0047 (1” keyed shaft)
HY390 (13.0 hp) - 2541-0048 (1” keyed shaft)
2541-0049 (1” keyed shaft w/electric start)
2541-0050 (1” threaded shaft)
2541-0051 (1” threaded shaft w/electric start)
Note: Unit is not shipped with oil. Please add oil to engine prior to operating.

ENGINE SAFETY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
COMPONENTS & CONTROL LOCATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
CHECK BEFORE OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
STORAGE/TRANSPORTATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
TECHNICAL & CONSUMER INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
ENGINE REPLACEMENT PARTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
WIRING DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
OPTIONAL PARTS – BATTERY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
READ THIS OWNER’S MANUAL CAREFULLY. Pay special attention to these symbols and any
instructions that follow:
Indicates serious injury or death will result if instructions are not followed.
Indicates a strong possibility that serious injury or death could result
if instructions are not followed.
Indicates a possibility that minor injury could result if instructions are not followed.
Indicates that equipment or property damage can result if instructions are not followed.
Gives helpful information.
Table of Contents

3
IMPORTANT SAFETY INFORMATION
Most accidents with engines can be prevented if
you follow all instructions in this manual and on the
engine. Some of the most common hazards are
discussed below, along with the best way to protect
yourself and others.
Owner Responsibilities
•The engines are designed to give safe and
dependable service if operated according to
instructions. Read and understand this owner’s
manual before operating the engine. Failure to do
so could result in personal injury or equipment
damage.
•Know how to stop the engine quickly, and under-
stand the operation of all controls. Never permit
anyone to operate the engine without proper
instructions.
•Do not allow children to operate the engine. Keep
children and pets away from the area of operation.
Refuel with Care
Gasoline is extremely flammable, and gasoline
vapor can explode. Refuel outdoors, in a well-venti-
lated area, with the engine stopped. Never smoke
near gasoline, and keep other flames and sparks
away. Always store gasoline in an approved con-
tainer.If any fuel is spilled, make sure the area is
dry before starting the engine.
Hot Exhaust
•The muffler becomes very hot during operation
and remains hot for a while after stopping the
engine. Be careful not to touch the muffler while it
is hot. Let the engine cool before storing it indoors.
•To prevent fire hazards and to provide adequate
ventilation for stationary equipment applications,
keep the engine at least 3 feet (1 meter) away from
building walls and other equipment during opera-
tion. Do not place flammable objects close to the
engine.
Carbon Monoxide Hazard
Exhaust gas contains poisonous carbon monoxide.
Avoid inhalation of exhaust gas. Never run the
engine in a closed garage or confined area.
Other Equipment
Review the instructions provided with the equip-
ment powered by this engine for any additional
safety precautions that should be observed in con-
junction with engine startup, shutdown, operation,
or protective apparel that may be needed to oper-
ate the equipment.
Engine Safety Information

4
Components & Control Locations

5
Fuel Valve Lever
The fuel valve opens and closes the passage
between the fuel tank and the carburetor. The fuel
valve lever must be in the ON position for the
engine to run. When the engine is not in use, leave
the fuel valve lever in the OFF position to prevent
carburetor flooding and to reduce the possibility of
fuel leakage.
Throttle Lever
The throttle lever controls engine speed. Moving
the throttle lever in the directions (shown below)
makes the engine run faster or slower.
Engine Switch
The engine switch enables and disables the ignition
system. The engine switch must be in the ON posi-
tion for the engine to run. Turning the engine switch
to the OFF position stops the engine.
Choke Lever
The choke lever opens and closes the choke valve
in the carburetor. The CLOSE position enriches the
fuel mixture for starting a cold engine. The OPEN
position provides the correct fuel mixture for opera-
tion after starting and for restarting a warm engine.
Some engine applications use a remotely-mounted
choke control rather than the engine-mounted
choke lever shown here.
Recoil Starter Grip
Pulling the starter grip operates the recoil starter to
crank the engine.
Controls

6
IS YOUR ENGINE READY TO GO?
For your safety, and to maximize the service life of
your equipment, it is very important to take a few
moments before you operate the engine to check
its condition. Be sure to take care of any problem
you find, or have your servicing dealer correct it,
prior to operating the engine.
Improperly maintaining this engine, or failing
to correct a problem before operation, could
cause a malfunction in which you could be
seriously injured.
Always perform a preoperation inspection
before each operation, and correct any
problem.
Before beginning your preoperation checks, be
sure the engine is level and the engine switch is in
the OFF position.
Check the General Condition of the Engine
•Look around and underneath the engine for signs
of oil or gasoline leaks.
•Remove any excessive dirt or debris, especially
around the muffler and recoil starter.
•Look for signs of damage.
•Check that all shields and covers are in place,
and all nuts, bolts, and screws are tightened.
Check the Engine
•Check the engine oil level. Running the engine
with a low oil level can cause engine damage. The
Low Oil Sensor (applicable engine types) will auto-
matically stop the engine before the oil level falls
below safe limits. However, to avoid the inconven-
ience of an unexpected shutdown, always check
the engine oil level before startup.
•Check the air filter. A dirty air filter will restrict air
flow to the carburetor, reducing engine perform-
ance.
•Check the fuel level. Starting with a full tank will
help to eliminate or reduce operating interruptions
for refueling.
Check the Equipment Powered by this
Engine
Review the instructions provided with the equip-
ment powered by this engine for any precautions
and procedures that should be followed before
engine startup.
Check Before Operation

7
SAFE OPERATING PRECAUTIONS
Before operating the engine for the first time,
please review the IMPORTANT SAFETY
INFORMATION and the section titled BEFORE
OPERATION.
Carbon monoxide gas is toxic. Breathing it can
cause unconsciousness and even death.
Avoid any areas or actions that expose you to
carbon monoxide.
Review the instructions provided with the equip-
ment powered by this engine for any safety precau-
tions that should be observed in conjunction with
engine startup, shutdown, or operation.
STARTING THE ENGINE
1. Move the fuel valve lever to the ON position.
2. To start a cold engine, move the choke lever to
the CLOSE position.
To restart a warm engine, leave the choke lever in
the OPEN position.
Some engine applications use a remotely-mounted
choke control rather than the engine-mounted
choke lever shown here.
3. Move the throttle lever away from the SLOW
position, about 1/3 of the way toward the FAST
position.
Some engine applications use a remotely-mounted
throttle control rather than the engine-mounted
throttle lever shown here.
4. Turn the engine switch to the ON position.
5. Operate the starter.
RECOIL STARTER (all engine types):
Pull the starter grip lightly until you feel resistance,
then pull briskly.
Return the starter grip gently.
6. If the choke lever has been moved to the CLOSE
position to start the engine, gradually move it to the
OPEN position as the engine warms up.
Operation

8
SETTING ENGINE SPEED
Position the throttle lever for the desired engine
speed. Some engine applications use a remotely-
mounted throttle control rather than the engine-
mounted throttle lever shown here.
For engine speed recommendations, refer to the
instructions provided with the equipment powered
by this engine.
STOPPING THE ENGINE
To stop the engine in an emergency, simply turn the
engine switch to the OFF position. Under normal
conditions, use the following procedure.
1. Move the throttle lever to the SLOW position.
Some engine applications use a remotely-mounted
throttle control rather than the engine-mounted
throttle lever shown here.
2. Turn the engine switch to the OFF position.
3. Turn the fuel valve lever to the OFF position.
Operation

9
THE IMPORTANCE OF MAINTENANCE
Good maintenance is essential for safe, economi-
cal, and trouble-free operation. It will also help
reduce air pollution.
Improperly maintaining this engine, or failure to
correct a problem before operation, can cause
amalfunction in which you can be seriously
hurt or killed.
Always follow the inspection and maintenance
recommendations and schedules in this
owner’s manual.
To help you properly care for your engine, the fol-
lowing pages include a maintenance schedule, rou-
tine inspection procedures, and simple mainte-
nance procedures using basic hand tools. Other
service tasks that are more difficult, or require spe-
cial tools, are best handled by professionals and
are normally performed by a technician or other
qualified mechanic.
The maintenance schedule applies to normal oper-
ating conditions. If you operate your engine under
unusual conditions, such as sustained high-load or
high-temperature operation, or use in unusually wet
or dusty conditions, consult your servicing dealer
for recommendations applicable to your individual
needs and use.
MAINTENANCE SAFETY
Some of the most important safety precautions are
as follows. (Note: We cannot warn you of every
conceivable hazard that can arise in performing
maintenance. Only you can decide whether or not
you should perform a given task.)
Failure to properly follow maintenance
instructions and precautions can cause you
to be seriously hurt or killed.
Always follow the procedures and precautions
in the owner’s manual.
Safety Precautions
•Make sure the engine is off before you begin any
maintenance or repairs. This will eliminate several
potential hazards:
•Carbon monoxide poisoning from engine
exhaust. Be sure there is adequate ventilation
whenever you operate the engine.
•Burns from hot parts. Let the engine and
exhaust system cool before touching.
•Injury from moving parts. Do not run the
engine unless instructed to do so.
•Read the instructions before you begin, and make
sure you have the tools and skills required to per-
form the maintenance.
•To reduce the possibility of fire or explosion, be
careful when working around gasoline. Use only a
nonflammable solvent, not gasoline, to clean parts.
Keep cigarettes, sparks and flames away from all
fuel-related parts.
Remember that your servicing dealer knows your
engine best and is fully equipped to maintain and
repair it.
To ensure the best quality and reliability, use only
new,genuine parts or their equivalents for repair
and replacement.
Maintenance

10
REFUELING
Part Number HP Fuel Tank Capacity
2541-0043 5.5 3.6 L 0.95 Gal
2541-0044
2541-0045 6.5
2541-0046
2541-0047 9 6.0 L 1.6 Gal
2541-0048 13 6.5 L 1.7 Gal
2541-0049
2541-0050
2541-0051
With the engine stopped, remove the fuel tank cap
and check the fuel level. Refill the tank if the fuel
level is low.
Gasoline is highly flammable and explosive.
You can be burned or seriously injured when
handling fuel.
•Stop the engine and keep heat, sparks and
flame away.
•Handle fuel only outdoors.
•Wipe up spills immediately.
Refuel in a well-ventilated area before starting the
engine. If the engine has been running, allow it to
cool. Refuel carefully to avoid spilling fuel. Do not
fill above the fuel strainer shoulder. After refueling,
tighten the fuel tank cap securely.
Never refuel the engine inside a building where
gasoline fumes may reach flames or sparks. Keep
gasoline away from appliance pilot lights, barbe-
cues, electric appliances, power tools, etc.
Maintenance
MAINTENANCE SCHEDULE
REGULAR SERVICE PERIOD First Every Every Every
Performed at every indicated month or Each month 3 months 6 months year
operating hour interval, whichever comes first. use or or or or
Item 20 hours 50 hours 100 hours 300 hours
• Engine oil Check level °
Change ° °
• Air cleaner Check °
Clean °(1)
Replace °†
• Sediment cup Clean °
• Spark plug Check-Clean °
Replace °
Spark arrester Clean
(optional parts) °
• Idle speed Check-Adjust °(2)
• Valve clearance Check-Adjust °(2)
• Fuel tank and strainer Clean °(2)
• Combustion chamber Clean After every 300 Hrs. (2)
• Fuel line Check Every 2 years (Replace if necessary) (2)
•Emission-related items. † Replace the paper element type only.
(1) Service more frequently when used in dusty areas.
(2) These items should be serviced by your servicing dealer unless you have the proper tools and are mechanically proficient.

11
Spilled fuel is not only a fire hazard, it causes envi-
ronmental damage. Wipe up spills immediately.
Fuel can damage paint and plastic. Be careful
not to spill fuel when filling your fuel tank.
Damage caused by spilled fuel is not covered
under warranty.
FUEL RECOMMENDATIONS
Use unleaded gasoline with a pump octane rating
of 86 or higher.
These engines are certified to operate on unleaded
gasoline. Unleaded gasoline produces fewer
engine and spark plug deposits and extends
exhaust system life.
Never use stale or contaminated gasoline or an
oil/gasoline mixture. Avoid getting dirt or water in
the fuel tank.
Occasionally you may hear a light ‘‘spark knock’’ or
‘‘pinging’’ (metallic rapping noise) while operating
under heavy loads. This is no cause for concern.
If spark knock or pinging occurs at a steady engine
speed, under normal load, change brands of gaso-
line. If spark knock or pinging persists, see an
authorized servicing dealer.
Running the engine with persistent spark knock
or pinging can cause engine damage.
Running the engine with persistent spark knock
or pinging is considered misuse, and Hypro’s
Limited Warranty does not cover parts dam-
aged by misuse.
ENGINE OIL LEVEL CHECK
Check the engine oil level with the engine stopped
and in a level position.
1. Remove the filler cap/dipstick and wipe it clean.
2. Insert and remove the dipstick without screwing it
into the filler neck. Check the oil level shown on the
dipstick.
3. If the oil level is low, fill to the edge of the oil filler
hole with the recommended oil.
4. Screw in the filler cap/dipstick securely.
Running the engine with a low oil level can
cause engine damage.
The Low Oil Sensor (applicable engine types) will
automatically stop the engine before the oil level
falls below safe limit. However, to avoid the incon-
venience of an unexpected shutdown, always
check the engine oil level before startup.
ENGINE OIL CHANGE
Drain the used oil while the engine is warm. Warm
oil drains quickly and completely.
1. Place a suitable container below the engine to
catch the used oil, and then remove the filler
cap/dipstick and the drain plug.
2. Allow the used oil to drain completely, and then
reinstall the drain plug and tighten it securely.
Please dispose of used motor oil in a manner that
is compatible with the environment. Wesuggest
you take used oil in a sealed container to your local
recycling center or service station for reclamation.
Do not throw it in the trash, pour it on the ground, or
down a drain.
3. With the engine in a level position, fill to the outer
edge of the oil filler hole with the recommended oil.
ENGINE OIL CAPACITIES:
Part Number HP Oil Capacity
2541-0043 5.5 0.60L 0.63 Qt
2541-0044
2541-0045 6.5
2541-0046
2541-0047 9 1.1L 1.2 Qt
2541-0048 13
2541-0049
2541-0050
2541-0051
Running the engine with a low oil level can cause
engine damage.
The Low Oil Sensor (applicable engine types) will
automatically stop the engine before the oil level
falls below the safe limit.
Maintenance

12
However, to avoid the inconvenience of an unex-
pected shutdown, fill to the upper limit, and check
the oil level regularly.
4. Screw in the filler cap/dipstick securely.
SERVICING YOUR ENGINE
ENGINE OIL RECOMMENDATIONS
Oil is a major factor affecting performance and
service life. Use 4-stroke automotive detergent oil.
SAE 10W-30 is recommended for general use.
Other viscosities shown in the chart may be used
when the average temperature in your area is with-
in the recommended range.
The SAE oil viscosity and service classification are
in the API label on the oil container. Werecom-
mend that you use API SERVICE Category SG or
SH oil.
AIR FILTER INSPECTION
Remove the air cleaner cover and inspect the filter.
Clean or replace dirty filter elements. Always
replace damaged filter elements. If equipped with
an oil-bath air cleaner, also check the oil level.
AIR CLEANER SERVICE
A dirty air filter will restrict air flow to the carburetor,
reducing engine performance.
If you operate the engine in very dusty areas, clean
the air filter more often than specified in the MAIN-
TENANCE SCHEDULE.
Operating the engine without an air filter, or
with a damaged air filter,will allow dirt to enter
the engine, causing rapid engine wear.This
type of damage is not covered by Hypro’s
Limited Warranty.
Maintenance

13
Dual-Filter Element Types
1. Remove the wing nut
from the air cleaner
cover, and remove the air
cleaner cover.
2. Remove the wing nut
from the air filter, and
remove the filter.
3. Remove the foam filter
from the paper filter.
4. Inspect both air filter
elements, and replace
them if they are dam-
aged. Always replace the
paper air filter element at
the scheduled interval.
5. Clean the air filter elements if they are to be
reused.
Paper air filter element: Tap the filter element sev-
eral times on a hard surface to remove dirt, or blow
compressed air [not exceeding 30 psi (207 kPa)]
through the filter element from the inside. Never try
to brush off dirt; brushing will force dirt into the
fibers.
Foam air filter element: Clean in warm, soapy
water, rinse, and allow drying thoroughly. Or clean
in nonflammable solvent and allow drying. Dip the
filter element in clean engine oil, and then squeeze
out all excess oil. The engine will smoke when
started if too much oil is left in the foam.
1. Using a moist rag, wipe dirt from the inside of the
air cleaner base and cover.Be careful to prevent
dirt from entering the air duct that leads to the car-
buretor.
2. Place the foam air filter element over the paper
element, and reinstall the assembled air filter.Be
sure the gasket is in place beneath the air filter.
Tighten the air filter wing nut securely.
3. Install the air cleaner cover, and tighten the cover
wing nut securely.
Oil-Bath Type
1. Remove the wing nut, and remove the air clean-
er cap and cover.
2. Remove the air filter from the cover, wash the
cover and filter in warm, soapy water, rinse, and
allow drying thoroughly. Or clean in nonflammable
solvent and allow drying.
3. Dip the filter in clean engine oil, and then
squeeze out all excess oil. The engine will smoke if
too much oil is left in the foam.
4. Empty the used oil from the air cleaner case,
wash out any accumulated dirt with nonflammable
solvent, and dry the case.
5. Fill the air cleaner case to the OIL LEVEL mark
with the same oil that is recommended for the
engine. Oil capacity: 2.0 US oz (60 cm3 )
6. Reassemble the air cleaner, and tighten the wing
nut securely.
Maintenance

14
SEDIMENT CUP CLEANING
1. Move the fuel valve to the OFF position, and
then remove the fuel sediment cup and O-ring.
Gasoline is highly flammable and explosive. You
can be burned or seriously injured when han-
dling fuel.
•Keep heat, sparks and flame away.
•Handle fuel only outdoors.
•Wipe up spills immediately.
2. Wash the sediment cup and O-ring in nonflam-
mable solvent, and dry them thoroughly.
3. Place the O-ring in the fuel valve, and install the
sediment cup. Tighten the sediment cup securely.
4. Move the fuel valve to the ON position, and
check for leaks. Replace the O-ring if there is any
leakage.
SPARK PLUG SERVICE
Recommended spark plugs: F7RTC or other equiv-
alents.
An incorrect spark plug can cause engine
damage.
1. Disconnect the spark plug cap, and remove any
dirt from around the spark plug area.
2. Remove the spark plug with a spark plug
wrench.
3. Inspect the spark plug. Replace it if the elec-
trodes are worn, or if the insulator is cracked or
chipped.
4. Measure the spark plug electrode gap with a
suitable gauge.
The gap should be 0.028 -0.031 in (0.70 - 0.80
mm). Correct the gap, if necessary, by carefully
bending the side electrode.
5. By hand, install the spark plug carefully to avoid
cross-threading.
6. After the spark plug seats, tighten with a spark
plug wrench to compress the washer.
If reinstalling the used spark plug, tighten 1/8 -
1/4 turn after the spark plug seats.
If installing a new spark plug, tighten 1/2 turn after
the spark plug seats.
Aloose spark plug can overheat and damage
the engine. Over tightening the spark plug can
damage the threads in the cylinder head.
7. Attach the spark plug cap.
IDLE SPEED ADJUSTMENT
1. Start the engine outdoors, and allow it to warm
up to operating temperature.
2. Move the throttle lever to its slowest position.
3. Turn the throttle stop screw to obtain the stan-
dard idle speed.
Standard idle speed: 1,400±150 rpm
Maintenance

15
SPARK ARRESTER SERVICE
(optional equipment)
Your engine is not factory-equipped with a spark
arrester. In some areas, it is illegal to operate an
engine without a spark arrester. Check local laws
and regulations. A spark arrester is available from
authorized servicing dealers.
The spark arrester must be serviced every 100
hours to keep it functioning as designed.
If the engine has been running, the muffler will be
very hot. Allow the muffler to cool before servicing
the spark arrester.
1Remove the three 4 mm screws from the exhaust
deflector, and remove the deflector.
2. Remove the four 5 mm screws from the muffler
protector, and remove the muffler protector.
3. Remove the 4 mm screw from the spark arrester,
and remove the spark arrester from the muffler.
4. Use a brush to remove carbon deposits from the
spark arrester screen. Be careful to avoid damag-
ing the screen.
The spark arrester must be free of breaks and
holes. Replace the spark arrester if it is damaged.
5. Install the spark arrester, muffler protector and
exhaust deflector in reverse order of disassembly.
Maintenance

16
STORING YOUR ENGINE
Storage Preparation
Proper storage preparation is essential for keeping
your engine trouble free and looking good. The fol-
lowing steps will help to keep rust and corrosion
from impairing your engine’s function and appear-
ance, and will make the engine easier to start after
storage.
Cleaning
If the engine has been running, allow it to cool for at
least half an hour before cleaning. Clean all exterior
surfaces, touch up any damaged paint, and coat
other areas that may rust with a light film of oil.
Using a garden hose or pressure washing
equipment can force water into the air cleaner
or muffler opening. Water in the air cleaner will
soak the air filter, and water that passes
through the air filter or muffler can enter the
cylinder, causing damage.
Water contacting a hot engine can cause dam-
age. If the engine has been running, allow it to
cool for at least half an hour before washing.
Fuel
Gasoline will oxidize and deteriorate in storage. Old
gasoline will cause hard starting, and it leaves gum
deposits that clog the fuel system. If the gasoline in
your engine deteriorates during storage, you may
need to have the carburetor and other fuel system
components serviced or replaced.
The length of time that gasoline can be left in your
fuel tank and carburetor without causing functional
problems will vary with such factors as gasoline
blend, your storage temperatures, and whether the
fuel tank is partially or completely filled. The air in a
partially-filled fuel tank promotes fuel deterioration.
Very warm storage temperatures accelerate fuel
deterioration. Fuel deterioration problems may
occur within a few months, or even less if the gaso-
line was not fresh when you filled the fuel tank.
Hypro’sLimited Warranty does not cover fuel
system damage or engine performance prob-
lems resulting from neglected storage prepara-
tion.
You can extend fuel storage life by adding a fuel
stabilizer that is formulated for that purpose, or you
can avoid fuel deterioration problems by draining
the fuel tank and carburetor.
Adding a Fuel Stabilizer to Extend Fuel
Storage Life
When adding a fuel stabilizer, fill the fuel tank with
fresh gasoline. If only partially filled, air in the tank
will promote fuel deterioration during storage. If you
keep a container of gasoline for refueling, be sure
that it contains only fresh gasoline.
1. Add fuel stabilizer following the manufacturer’s
instructions.
2. After adding a fuel stabilizer, run the engine out-
doors for 10 minutes to be sure that treated gaso-
line has replaced the untreated gasoline in the car-
buretor.
3. Stop the engine, and move the fuel valve to the
OFF position.
Draining the Fuel Tank and Carburetor
1. Place an approved gasoline container below the
carburetor,and use a funnel to avoid spilling fuel.
2. Remove the carburetor drain bolt and sediment
cup, and then move the fuel valve lever to the ON
position.
3. After all the fuel has drained into the container,
reinstall the drain bolt and sediment cup. Tighten
them securely.
Storage/Transportation

17
Storage Precautions
1. Change the engine oil.
2. Remove the spark plugs.
3. Pour a tablespoon (5-10 cc) of clean engine oil
into the cylinder.
4. Pull the starter rope several times to distribute
the oil in the cylinder.
5. Reinstall the spark plugs.
6. Pull the starter rope slowly until resistance is felt.
This will close the valves so moisture cannot enter
the engine cylinder. Return the starter rope gently.
If your engine will be stored with gasoline in the fuel
tank and carburetor, it is important to reduce the
hazard of gasoline vapor ignition. Select a well-ven-
tilated storage area away from any appliance that
operates with a flame, such as a furnace, water
heater or clothes dryer. Also avoid any area with a
spark-producing electric motor, or where power
tools are operated.
If possible, avoid storage areas with high humidity,
because that promotes rust and corrosion.
Unless all fuel has been drained from the fuel tank,
leave the fuel valve lever in the OFF position to
reduce the possibility of fuel leakage.
Position the equipment so the engine is level.
Tilting can cause fuel or oil leakage.
With the engine and exhaust system cool, cover the
engine to keep out dust. A hot engine and exhaust
system can ignite or melt some materials. Do not
use sheet plastic as a dust cover. A nonporous
cover will trap moisture around the engine, promot-
ing rust and corrosion.
If equipped with a battery for an electric starter,
recharge the battery once a month while the engine
is in storage. This will help to extend the service life
of the battery.
Removal from Storage
Check your engine as described in the section
CHECK BEFORE OPERATION.
If the fuel was drained during storage preparation,
fill the tank with fresh gasoline. If you keep a con-
tainer of gasoline for refueling, be sure that it con-
tains only fresh gasoline. Gasoline oxidizes and
deteriorates over time, causing hard starting.
If the cylinders were coated with oil during storage
preparation, the engine may smoke briefly at start-
up. This is normal.
TRANSPORTING
If the engine has been running, allow it to cool for at
least 15 minutes before loading the engine-pow-
ered equipment on the transport vehicle. A hot
engine and exhaust system can burn you and can
ignite some materials.
Keep the engine level when transporting to reduce
the possibility of fuel leakage. Move the fuel valve
lever to the OFF position.
Storage/Transportation

18
ENGINE WILL NOT START Possible Cause Correction
1. Electric starting: Battery discharged. Recharge battery.
check battery.
2. Check control positions. Fuel valve OFF. Move lever to ON.
Choke OPEN. Move lever to CLOSE unless
engine is warm.
Engine switch OFF. Turn engine switch to ON.
3. Check fuel. Out of fuel. Refuel.
Bad fuel; engine stored without Drain fuel tank and carburetor.
treating or draining gasoline, or Refuel with fresh gasoline.
refueled with bad gasoline.
4. Remove and inspect Spark plugs faulty, fouled, or Gap, or replace spark plugs.
spark plugs. improperly gapped.
Spark plugs wet with fuel Dry and reinstall spark plugs.
(flooded engine). Start engine with throttle lever
in FAST position.
5. Other conditions. Fuel filter clogged, carburetor Replace or repair faulty
malfunction, ignition malfunction, components as necessary.
valve stuck, etc.
ENGINE LACKS POWER Possible Cause Correction
1. Check air filter. Filter element(s) clogged. Clean or replace filter
element(s).
2. Check fuel. Out of fuel. Refuel.
Bad fuel; engine stored without Drain fuel tank and carburetor.
treating or draining gasoline, or Refuel with fresh gasoline.
refueled with bad gasoline.
3. Other conditions. Fuel filter clogged, carburetor Replace or repair faulty
malfunction, ignition malfunction, components as necessary.
valve stuck, etc.
Troubleshooting

19
TECHNICAL INFORMATION
Serial Number Location
Record the engine serial number in the space
below. You will need this serial number when order-
ing parts and when making technical or warranty
inquiries.
Engine serial number: ______________________
Battery Connections for Electric Starter
Use a 12-volt battery with an ampere-hour rating of
at least 18 Ah.
Be careful not to connect the battery in reverse
polarity,as this will short circuit the battery charging
system. Always connect the positive (+) battery
cable to the battery terminal before connecting the
negative (-) battery cable, so your tools cannot
cause a short circuit if they touch a grounded part
while tightening the positive (+) battery cable end.
Abattery can explode if you do not follow the
correct procedure, seriously injuring anyone
nearby.
Keep all sparks, open flames and smoking
materials away from the battery.
1. Connect the battery positive (+) cable to the
starter solenoid terminal as shown.
2. Connect the battery negative (-) cable to an
engine mounting bolt, frame bolt, or other good
engine ground connection.
3. Connect the battery positive (+) cable to the
battery positive (+) terminal.
4. Connect the battery negative (-) cable to the
battery negative (-) terminal.
5. Coat the terminals and cable ends with grease.
Remote Control Linkage
The throttle and choke control levers are provided
with holes for optional cable attachment. The fol-
lowing illustrations show installation examples for a
solid wire cable and for a flexible, braided wire
cable. If using a flexible, braided wire cable, add a
return spring as shown.
It is necessary to loosen the throttle lever friction
nut when operating the throttle with a remotely-
mounted control.
Models: 2541-0043 thru 2541-0046
Technical & Consumer Information

20
Models: 2541-0047 thru 2541-0051
Carburetor Modification for High Altitude
Operation
At high altitude, the standard carburetor air-fuel
mixture will be too rich. Performance will decrease,
and fuel consumption will increase. A very rich mix-
ture will also foul the spark plug and cause hard
starting. Operation at an altitude that differs from
that at which this engine was certified, for extended
periods of time, may increase emissions.
High altitude performance can be improved by spe-
cific modifications to the carburetor. If you always
operate your engine at altitudes above 5,000 feet
(1,500 meters), have your servicing dealer perform
this carburetor modification. This engine, when
operated at high altitude with the carburetor modifi-
cations for high altitude use, will meet each emis-
sion standard throughout its useful life.
Even with carburetor modification, engine horse-
power will decrease about 3.5% for each 1,000-foot
(300-meter) increase in altitude. The effect of alti-
tude on horsepower will be greater than this if no
carburetor modification is made.
When the carburetor has been modified for high
altitude operation, the air-fuel mixture will be
too lean for low altitude use. Operation at alti-
tudes below 5,000 feet (1,500 meters) with a
modified carburetor may cause the engine to
overheat and result in serious engine damage.
For use at low altitudes, have your servicing
dealer return the carburetor to original factory
specifications.
Oxygenated Fuels
Some conventional gasolines are being blended
with alcohol or an ether compound. These gaso-
lines are collectively referred to as oxygenated
fuels. To meet clean air standards, some areas use
oxygenated fuels to help reduce emissions.
If you use an oxygenated fuel, be sure it is unlead-
ed and meets the minimum octane rating require-
ment.
Before using an oxygenated fuel, try to confirm the
fuel’s contents. Some areas require this information
to be posted on the pump.
The following are the EPA-approved percentages of
oxygenates:
ETHANOL – (ethyl or grain alcohol) 10% by
volume. You may use gasoline containing up to
10% ethanol by volume.
Gasoline containing ethanol may be marketed
under the name ‘‘Gasohol.’’
MTBE – (methyl tertiary butyl ether) 15% by
volume. You may use gasoline containing up to
15% MTBE by volume.
METHANOL – (methyl or wood alcohol) 5% by
volume. You may use gasoline containing up to 5%
methanol by volume, as long as it also contains
cosolvents and corrosion inhibitors to protect the
fuel system. Gasoline containing more than 5%
methanol by volume may cause starting and/or
performance problems. It may also damage metal,
rubber, and plastic parts of your fuel system.
If you notice any undesirable operating symptoms,
try another service station, or switch to another
brand of gasoline.
Fuel system damage or performance problems
resulting from the use of an oxygenated fuel con-
taining more than the percentages of oxygenates
mentioned above are not covered under warranty.
Technical & Consumer Information