Okuma 6.5 OHV, 56055, 5.5 OHV Owner’s Manual
5.5 HP OHV HORIZONTAL
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SHAFT ENGINE
Item # 56055
Owner's Manual
DO NOT RETURN TO STORE
Questions? Problems?
Please call our customer help line:
(888) 315-3080 M-F 84 CT
Thank you for purchasing this engine. Keep this owner's manual handy, so you can refer to it at
any time. This owner's manual is considered a permanent part of the engine and should remain
with the engine if resold. The information and specifications included in the publication were in
effect at the time of printing.
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IDEAL FOR:
• Go Karts
• Generators
• Pumps
• Compressors
5.5 HP OHV HORIZONTAL
SHAFT ENGINE
• Small Construction Equipment
• ...And More!
Notice Regarding Emissions
Engines that are certified to comply with U.S. EPA emission regulations for SORE
(Small Off Road Equipment), are certified to operate on regular unleaded gasoline, and
may include the following emission control systems: (EM) Engine Modifications and
(TWC) Three-Way Catalyst (if so equipped).
TABLE OF CONTENTS
GENERAL SAFETY PROCEDURES ........................................................................ 4
ENGINE COMPONENTS ..................................................................................... 7
PREPARING THE ENGINE FOR USE ............................................................... 8
Using the Engine for the First Time .................................................................. 8
Add Oil ........................................................................................... 8
Add Gasoline .................................................................................... 9
CONTROLS ....................................................................................................... 9
Fuel Valve Lever ........................................................................................ 9
Throttle Lever ........................................................................................... 10
Engine Switch ........................................................................................... 10
Choke Lever ............................................................................................. 10
Recoil Starter Handle ................................................................................... 11
BEFORE OPERATING ......................................................................................... 11
Check the General Condition of the Engine ......................................................... 12
Check the Engine ....................................................................................... 12
Check the Equipment Powered By This Engine .................................................... 12
OPERATION ..................................................................................................... 12
Safe Operating Precautions ............................................................................ 12
Starting the Engine ...................................................................................... 12
STOPPING THE ENGINE ..................................................................................... 14
MAINTENANCE / CARE ..................................................................................... 15
Refueling ................................................................................................. 16
Engine Oil Level Check ................................................................................ 17
Engine Oil Change ...................................................................................... 18
Air Filter Maintenance ................................................................................. 19
Sediment Cup Cleaning ................................................................................ 20
Spark Plug Maintenance ............................................................................... 21
STORING YOUR ENGINE .................................................................................... 22
Storage Preparation ..................................................................................... 22
Cleaning .................................................................................................. 22
Fuel ........................................................................................................ 22
Adding A Fuel Stabilizer to Extend Fuel Storage Life ............................................. 23
Draining the Fuel Tank Carburetor ................................................................... 23
Storage Precautions ..................................................................................... 24
REMOVAL FROM STORAGE ............................................................................... 24
TRANSPORTING ............................................................................................... 25
CARBURETOR MODIFICATION FOR HIGH ALTITUDE OPERATION ........................... 25
TROUBLESHOOTING ......................................................................................... 26
SPECIFICATIONS .............................................................................................. 27
EXPLODED VIEW AND PARTS LIST ..................................................................... 28
WARRANTY ..................................................................................................... 31
GENERAL SAFETY PROCEDURES
Please familiarize yourself with the following safety symbols and words:
The safety alert symbol A is used with one of the safety words (DANGER, CAUTION,
or WARNING) to alert you to hazards. Please pay attention to these hazard notices both
in this manual and on the engine.
DANGER: Indicates a hazard that will result in serious injury or death if instructions are
not followed.
WARNING: Indicates a strong possibility of causing serious injury or death if
instructions are not followed.
CAUTION: Indicates a possibility of personal injury or equipment damage if
instructions are not followed.
O If you have any questions regarding the hazard and safety notices listed in this
manual or on the product, please call (888) 315-3080 M-F 8-5CT before using the
engine.
A DANGER: This engine produces poisonous carbon monoxide gas when running.
This gas is both odorless and colorless. Even if you do not see or smell gas, carbon
monoxide may still be present. Breathing this poison can lead to headaches,
dizziness, drowsiness, and eventually death.
• Use outdoors ONLY in non-confined areas.
• Keep several feet of clearance on all sides to allow proper ventilation of the
engine..
_k WARNING: The exhaust from this product contains chemicals known to the
State of California to cause cancer, birth defects, or other reproductive harm.
A WARNING: This engine may emit highly flammable and explosive gasoline
vapors, which can cause severe burns or even death. A nearby open flame can lead
to explosion even if not directly in contact with gas.
• Do not operate near open flame.
• Do not smoke near engine.
• Always operate on a firm, level surface.
• Always turn engine off before refueling. Allow engine to cool for at least 2
minutes before removing fuel cap. Loosen cap slowly to relieve pressure in
tank.
• Do not overfill gas tank. Gas may expand during operation. Do not fill to the top
of the tank.
• Always check for spilled gas before operating.
• Empty gasoline tank before storing or transporting the engine.
• Before transporting, turn fuel valve to off and disconnect spark plug.
A WARNING: This engine produces heat when running. Temperatures near
exhaust can exceed 150°F (65 ° C).
• Do not touch hot surfaces. Pay attention to warning markings on the engine
denoting hot parts of the machine.
• Allow engine to cool several minutes after use before touching areas that heat
during use.
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 understand 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.
Other Equipment
Review the instructions provided with the equipment powered by this engine for any
additional safety precautions that should be observed in conjunctions with engine startup,
shutdown, operation, or protective apparel that may be needed to operate the equipment.
Engine Safety Labeling
In addition to the above safety notices, please familiarize yourself with the safety and
hazard markings on the engine as shown on the next page.
ENGINE COMPONENTS
Please fiamiliarize yourself with the locations and functions of the various components
and controls of your engine.
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(1) Air cleaner- removable and cleanable sponge
and paper element that limit the amount of dirt
pulled into the engine.
(2) Fuel Valve Lever- Controls flow of fuel into the
engine.
(3) Choke lever- Adjusts the alnount of air let into
the engine.
(4) Spark plug- Provides proper engine ignition.
(5) Muffler- Reduces engine noise.
(6) Throttle Lever- Use to control engine speed.
(7) On/Off Switch- Used to start/stop engine.
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(8) Recoil Starter Handle- Pull-cord for starting
engine.
(9) Fuel Cap- Access to the fuel tank for adding fuel.
(10) Fuel Tank- Stores gas used to run engine.
(11) Oil Fill and Dipstick- Location for checking and
filling engine oil.
(12) Oil Drain Plug- Location for draining oil.
PREPARING THE ENGINE FOR USE
Using the Engine for the First Time
The following section describes steps you must follow to prepare your engine for
first-time use. If after reading this" section, you are unsure about how to perform any
of the steps please call (888) 315-3080 M-F 8-5 CT for customer service. Failure
to perform these steps properly can damage your engine or shorten its"life.
If you are using the engine for the first time, there are a few steps you must take to
prepare it for operation:
Add Oil
The engine requires engine oil to operate properly. The engine, when new from the
carton, contains no oil in the crankcase. You must add the proper amount ofoil before
operating the engine for the first time. This amount, which is equal to the oil capacity of
the crankcase, is 20.2 fluid oz.
For general use, we recommend SAE 10W/30 oil to fill the engine crankcase.
To add oil, follow these steps:
1. Make sure the engine is on a level surface.
2. Unscrew the oil filler/dipstick cap from the engine as shown in figure 1.
3. Using a funnel, add 20.2 fluid ounces ofoil into the crankcase. You will know
the crankcase is full when the oil level has reached the lower lip of the opening
you have just poured the oil into (see figure 2).
4. Replace oil filler cap.
_iLLER CAFTDiPST_CK
Figure 1- Unscrewing the oil cap Figure 2- Adding oil
Add Gasoline
A WARNING: Gasoline and gas fumes are highly flammable.
• Do not fill tank near an open flame.
• Do not overfill. Always check for fuel spills.
To ensure that the engine runs smoothly use only FRESH, U_,,TLEADED GAS WITH AN
OCTANE RATING OF 87 OR HIGHER. To add gasoline:
1. Make sure the engine is on a level surface.
2. Unscrew gas cap and set aside (NOTE: the gas cap may be tight and hard to
unscrew).
3. Slowly add unleaded gasoline to the fuel tank. The capacity of the gas tank is 0.95
gallons. Be careful not to overfill. NOTE: Gas can expand. Do not fill the gas tank
to the very top.
4. Replace fuel cap and wipe up any spilled gasoline with a dry cloth.
IMPORTANT:
• Never use an oil/gasoline mixture.
• Never use old gas.
• Avoid getting dirt or water in the fuel tank.
• Gas can age in the tank and make it hard to start up the engine in the future. Never
store engine for extended periods of time with fuel in the tank.
CONTROLS
Fuel Valve Lever
• The fuel valve opens and closes the line 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.
OFF
OFF
Figure 3- Fuel Valve Lever
Throttle Lever
• The throttle lever controls engine speed.
• Moving the throttle lever in the directions shown makes the engine run slower or
faster.
LEVER
SLOW
Figure 4- Throttle Lever
Engine Switch
• The engine switch enables and disables the ignition system.
• The engine switch must be in the ON position for the engine to run,
• Turning the engine switch to the OFF position stops the engine.
ENGINE SWITCH
OFF
Figure 5- Engine Switch
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 operation 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.
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