Kohler Aegis 20 HP User manual

KOHLER® AEGIS 20,23 HP
LIQUID-COOLED
VERTICAL CRANKSHAFT
OWNER'S MANUAL

2
California
Proposition 65 Warning
Safety Precautions
Engine exhaust from this product
contains chemicals known to the
State of California to cause
cancer, birth defects, or other
reproductive harm.
WARNING
Explosive Fuel can cause fires and
severe burns.
Stop engine before filling fuel tank.
WARNING
Explosive Fuel!
Gasoline is extremely flammable
and its vapors can explode if
ignited. Store gasoline only in
approved containers, in well
ventilated, unoccupied buildings,
away from sparks or flames. Do not
fill the fuel tank while the engine is
hot or running, since spilled fuel
could ignite if it comes in contact
with hot parts or sparks from
ignition. Do not start the engine near
spilled fuel. ever use gasoline as a
cleaning agent.
Hot Parts!
Engine components can get
extremely hot from operation. To
prevent severe burns, do not touch
these areas while the engine is
running, or immediately after it is
turned off. ever operate the engine
with heat shields or guards
removed.
For Your Safety!
These precautions should be followed at all times. Failure to follow these precautions could result
in injury to yourself and others.
To insure safe operations please read the following statements and understand their meaning.
Also refer to your equipment owner's manual for other important safety information. This manual
contains safety precautions which are explained below. Please read carefully.
WARNING
Warning is used to indicate the presence of a hazard that can cause severe personal in ury, death,
or substantial property damage if the warning is ignored.
CAUTI N
Caution is used to indicate the presence of a hazard that will or can cause minor personal in ury
or property damage if the caution is ignored.
N TE
Note is used to notify people of installation, operation, or maintenance information that is important
but not hazard-related.
Hot Parts can cause severe burns.
Do not touch engine while operating
or just after stopping.
Hot Liquid!
The liquid coolant can get extremely
hot from operation. Turning the
radiator cap when the engine is hot
can allow steam and scalding liquid
to blow out and burn you severely.
Shut off machine. Only remove
radiator cap when cool enough to
touch with bare hands. Slowly
loosen cap to first stop to relieve
pressure before removing
completely.
Hot liquid can cause severe burns.
Do not loosen radiator cap while
engine is operating or warm to the
touch.
WARNING

3
Carbon Monoxide can cause
severe nausea, fainting or death.
Do not operate engine in closed or
confined area.
WARNING WARNING
Explosive Gas can cause fires and
severe acid burns.
Charge battery only in a well
ventilated area. Keep sources of
ignition away.
Accidental Starts!
Disabling engine. Accidental
starting can cause severe injury
or death. Before working on the
engine or equipment, disable the
engine as follows: 1) Disconnect the
spark plug lead(s). 2) Disconnect
negative (-) battery cable from
battery.
Lethal Exhaust Gases!
Engine exhaust gases contain
poisonous carbon monoxide.
Carbon monoxide is odorless,
colorless, and can cause death if
inhaled. Avoid inhaling exhaust
fumes, and never run the engine in
a closed building or confined area.
Explosive Gas!
Batteries produce explosive
hydrogen gas while being charged.
To prevent a fire or explosion,
charge batteries only in well
ventilated areas. Keep sparks, open
flames, and other sources of ignition
away from the battery at all times.
Keep batteries out of the reach of
children. Remove all jewelry when
servicing batteries.
Before disconnecting the negative
(-) ground cable, make sure all
switches are OFF. If O , a spark will
occur at the ground cable terminal
which could cause an explosion if
hydrogen gas or gasoline vapors
are present.
Safety Precautions (Cont.)
Accidental tarts can cause severe
injury or death.
Disconnect and ground spark plug
leads before servicing.
WARNING
Electrical Shock!
ever touch electrical wires or
components while the engine is
running. They can be sources of
electrical shock.
CAUTION
Electrical hock can cause injury.
Do not touch wires while engine is
running.
Rotating Parts can cause severe
injury.
Stay away while engine is in
operation.
WARNING
Rotating Parts!
Keep hands, feet, hair, and clothing
away from all moving parts to
prevent injury. ever operate the
engine with covers, shrouds, or
guards removed.
Congratulations  You have selected a fine four-cycle, twin cylinder, liquid-cooled engine. Kohler designs long
life strength and on-the- ob durability into each engine...making a Kohler engine dependable...dependability you
can count on. Here are some reasons why:
 Efficient overhead valve design, and pressure lubrication provide maximum power, torque, and reliability
under all operating conditions.
 Dependable, maintenance free electronic ignition ensures fast, easy starts time after time.
 Kohler engines are easy to service. All routine service areas (like the dipstick and oil fill, air cleaner, spark
plugs, and carburetor) are easily and quickly accessible.
 Parts sub ect to the most wear and tear (like the cylinder liner and camshaft) are made from precision
formulated cast iron.
 Every Kohler engine is backed by a worldwide network of over 10,000 distributors and dealers. Service
support is ust a phone call away. Call 1-800-544-2444 (U.S. & Canada) for Sales & Service assistance.
To keep your engine in top operating condition, follow the maintenance procedures in this manual.

4
il Fill/
Dipstick
Electric
Starter
Engine
Identification Label
Spark Plug
Valve Cover with
Integral Breather
il Filter
Fuel
Pump
Spark
Plug
Upper Blower Housing and
Air Intake Screen Assembly
Retaining
Strap
Figure 1. Typical Kohler® Aegis Vertical Shaft Engine.
Figure 3. il Container Logo.
Refer to Maintenance Instructions beginning on
page 8 for detailed oil check, oil change, and oil
filter change procedures.
Fuel Recommendations
WARNING: Explosive Fuel!
Gasoline is extremely flammable and its vapors can
explode if ignited. Store gasoline only in approved
containers, in well ventilated, unoccupied buildings,
away from sparks or flames. Do not fill the fuel tank
while the engine is hot or running, since spilled fuel
could ignite if it comes in contact with hot parts or
sparks from ignition. Do not start the engine near
spilled fuel. ever use gasoline as a cleaning agent.
General Recommendations
Purchase gasoline in small quantities and store in
clean, approved containers. A container with a capacity
of 2 gallons or less with a pouring spout is
recommended. Such a container is easier to handle
and helps eliminate spillage during refueling.
Do not use gasoline left over from the previous season,
to minimize gum deposits in your fuel system and to
insure easy starting.
Do not add oil to the gasoline. Do not overfill the fuel
tank. Leave room for the fuel to expand.
Oil Recommendations
Using the proper type and weight of oil in the
crankcase is extremely important. So is checking oil
daily and changing oil regularly. Failure to use the
correct oil, or using dirty oil, causes premature engine
wear and failure.
il Type
Use high quality detergent oil of API (American
Petroleum Institute) service class SG, SH, SJ or
higher. Synthetic oils may be used. Select the viscosity
based on the air temperature at the time of operation as
shown in the following table.
Figure 2. Viscosity Grades Table.
NOTE: Using other than service class SG, SH, SJ or
higher oil or extending oil change intervals
longer than recommended can cause engine
damage.
A logo or symbol on oil containers identifies the API
service class and SAE viscosity grade. See Figure 3.
*Use of synthetic oil having 5W-20 or 5W-30 rating is acceptable,
up to 4°C (40°).
**Synthetic oils will provide better starting in extreme cold
below -23°C (-10°).
*
**

5
Fuel Type
For best results use only clean, fresh, unleaded
gasoline with the pump sticker octane rating of 87 or
higher. In countries using the Research method, it
should be 90 octane minimum.
Unleaded gasoline is recommended as it leaves less
combustion chamber deposits. Leaded gasoline may
be used in areas where unleaded is not available and
exhaust emissions are not regulated. Be aware
however, that the cylinder heads may require more
frequent service.
Gasoline/Alcohol blends
Gasohol (up to 10% ethyl alcohol, 90% unleaded
gasoline by volume) is approved as a fuel for Kohler
engines. Other gasoline/alcohol blends are not
approved.
Gasoline/Ether blends
Methyl Tertiary Butyl Ether (MTBE) and unleaded
gasoline blends (up to a maximum of 15% MTBE by
volume) are approved as a fuel for Kohler engines.
Other gasoline/ether blends are not approved.
Coolant Recommendations
Use equal parts of ethylene glycol (anti-freeze) and
water only. Distilled or deionized water is
recommended, especially in areas where the water
contains a high mineral content. Propylene glycol
based anti-freeze is not recommended.
This mixture will provide protection from -37° C (-34° F)
to 108° C (226° F). For protection and use outside the
indicated temperature limits, follow the anti-freeze
manufacturers instructions on the container, but do not
exceed 70% anti-freeze.
DO NOT use anti-freeze with stop-leak additive(s), or
put any other additives in the cooling system.
Engine dentification Numbers
When ordering parts, or in any communication
involving an engine, always give the Model,
Specification, and Serial Numbers of the engine.
The engine identification numbers appear on a decal
affixed to the engine blower housing. Include letter
suffixes, if there are any.
Record your engine identification numbers on the
identification label (Figure 4) for future reference.
Figure 4. Engine Identification Label.
The Emission Compliance Period referred to on the
Emission Control or Air Index label indicates the
number of operating hours for which the engine has
been shown to meet Federal and CARB emission
requirements. The following table provides the Engine
Compliance Period (in hours) associated with the
category descriptor found on the certification label.
Emission Compliance Period (Hours)
EPA
CARB
Category C
250 Hours
Moderate
125 Hours
Category B
500 Hours
Intermediate
250 Hours
Category A
1000 Hours
Extended
500 Hours
Refer to certification label for engine displacement.
Exhaust Emission Control System for models LV625
and LV675 is EM.
Model Designation
Model LV675 for example: L designates liquid cooled,
V designates vertical crankshaft, and 675 designates
engine size or the approximate displacement in cubic
centimeters. A letter suffix designates a specific
version as follows:
Suffix Designates
S Electric Start
*Small ff-Road Engines
IMPORTANT ENGINE IN ORMATION
THIS ENGINE MEETS U.S. EPA 2004 AND
CALI ORNIA 2006 AND LATER EMISSION
CONTROL REGULATIONS OR SI SORE*
FAMILY
DISPL. (CC)
M DEL N .
SPEC. N .
SERIAL N .
EMISSION COMPLIANCE PERIOD:
EPA: CARB:
KOHLER CO. KOHLER, WISCONSIN USA
THIS ENGINE IS CERTI IED TO OPERATE
ON:
RE ER TO OWNER'S MANUAL OR SA ETY,
MAINTENANCE SPECS AND ADJUSTMENTS.
OR SALES/SERVICE IN US/CANADA, CALL:
1-800-544-2444
www.kohlerengines.com

6
Pre-Start Checklist
 Check oil level. Add oil if low. Do not overfill.
 Check coolant level. Add coolant if low.
 Check fuel level. Add fuel if low.
 Check radiator, cooling air intake areas and
external surfaces of engine. Make sure they are
clean and unobstructed.
 Check that the air cleaner components and all
shrouds, equipment covers, and guards are in
place and securely fastened.
 Check that any clutches or transmissions are
disengaged or placed in neutral. This is especially
important on equipment with hydrostatic drive. The
shift lever must be exactly in neutral to prevent
resistance which could keep the engine from
starting.
WARNING: Lethal Exhaust Gases!
Engine exhaust gases contain poisonous carbon
monoxide. Carbon monoxide is odorless, colorless,
and can cause death if inhaled. Avoid inhaling exhaust
fumes, and never run the engine in a closed building or
confined area.
Cold Weather Starting Hints
1. The cooling system must be filled with coolant
capable of providing proper protection against
freezing at the lowest temperature expected (see
Coolant Recommendations on page 5).
2. Be sure to use the proper oil for the temperature
expected. See Figure 2 on page 4.
3. Declutch all possible external loads.
4. A warm battery has much more starting capacity
than a cold battery.
5. Use fresh winter grade fuel. NOTE: Winter grade
gasoline has higher volatility to improve starting.
Do not use gasoline left over from summer.
Starting
1. Place the throttle control midway between the
slow and fast positions. Place the choke
control into the on position.
2. Start the engine by activating the key switch.
Release the switch as soon as the engine starts.
NOTE: Do not crank the engine continuously for
more than 10 seconds at a time. If the
engine does not start, allow a 60 second
cool down period between starting
attempts. Failure to follow these
guidelines can burn out the starter motor.
NOTE: Upon start-up, a metallic ticking may
occur. This is caused by hydraulic lifter
leakdown during storage. Run the engine
for 5 minutes. The noise will normally
cease in the first minute. If noise
continues, run the engine at mid-throttle
for 20 minutes. If noise persists, take the
engine to your local Kohler Service outlet.
If the starter does not turn the engine over, shut
off starter immediately. Do not make further
attempts to start the engine until the condition is
corrected. Do not ump start using another battery
(refer to Battery on page 7). See your Kohler
Engine Service Dealer for trouble analysis.
3. For a Cold Engine  Gradually return the choke
control to the off position after the engine starts
and warms up.
The engine/equipment may be operated during
the warm up period, but it may be necessary to
leave the choke partially on until the engine warms
up.
4. For a Warm Engine  Return choke to off
position as soon as engine starts.
Stopping
1. Remove the load by disengaging all PTO
attachments.
2. Position the throttle control somewhere between
half and full throttle; then stop the engine.
Operating Instructions
Also read the operating instructions of the equipment this engine powers.

7
Battery
A 12 volt battery is normally used. Refer to the
operating instructions of the equipment this engine
powers for specific battery requirements.
If the battery charge is not sufficient to crank the
engine, recharge the battery (see page 15).
Operating
Angle of peration
This engine will operate continuously at angles up to
20°. Check oil level to assure crankcase oil level is at
the FULL mark on the dipstick.
Refer to the operating instructions of the equipment
this engine powers. Because of equipment design or
application, there may be more stringent restrictions
regarding the angle of operation.
NOTE: Do not operate this engine continuously at
angles exceeding 20° in any direction. Engine
damage could result from insufficient
lubrication.
Cooling
NOTE: If debris builds up on the air intake screen,
radiator, or other cooling areas, stop the
engine immediately and clean. Operating the
engine with blocked or dirty air intake and
cooling areas can cause extensive damage
due to overheating. See Clean Air Intake/
Cooling Area, page 14.
High Temperature Sensor
Some engines are equipped with a high temperature
sensor mounted in the cooling system. If the safe
operating temperature is exceeded, it will either shut
off the engine or activate a warning signal, depending
on the application.
If the warning light illuminates or engine kills indicating
excessive operating temperatures:
1. Make sure all air intake and cooling surfaces are
clean and free of debris.
2. After engine has sufficiently cooled, check the
coolant level in system to make sure it is not low.
See Checking Coolant Level, page 10.
3. Check the system for external leaks.
4. If the cause is none of the above or cannot be
identified, contact an Authorized Kohler Engine
Dealer for appropriate diagnosis and correction.
WARNING: Hot Parts!
Engine components can get extremely hot from
operation. To prevent severe burns, do not touch these
areas while the engine is running, or immediately after
it is turned off. ever operate the engine with heat
shields or guards removed.
Engine Speed
NOTE: Do not tamper with the governor setting to
increase the maximum engine speed.
Overspeed is hazardous and will void the
engine warranty. The maximum allowable high
idle speed for these engines is 3750 RPM.

8
Maintenance Instructions
Maintenance, repair, or replacement of the emission control devices and systems, which are being done at
the customers expense, may be performed by any non-road engine repair establishment or individual.
Warranty repairs must be performed by an authorized Kohler service outlet.
WARNING: Accidental Starts!
Disabling engine. Accidental starting can cause severe injury or death. Before working on the engine or
equipment, disable the engine as follows: 1) Disconnect the spark plug lead(s). 2) Disconnect negative (-) battery
cable from battery.
Maintenance Schedule
These required maintenance procedures should be performed at the frequency stated in the table. They should
also be included as part of any seasonal tune-up.
Maintenance RequiredFrequency
 Fill fuel tank.
 Check oil level.
 Check coolant level.
 Check air cleaner for dirty1, loose, or damaged parts.
 Check air intake screen, radiator, and cooling areas, clean as necessary1.
 Service precleaner element1.
 Replace air cleaner element1.
 Clean and check cooling areas1.
 Replace fuel filter.
Every 25 Hours
Daily or Before
Starting Engine
Every 100 Hours
Annually or
Every 200 Hours
 Change oil and oil filter (more frequently under severe conditions).
 Check spark plug condition and gap.
 Have solenoid shift starter disassembled and cleaned2.
 Replace spark plugs.
Annually or
Every 500 Hours
1Perform these maintenance procedures more frequently under extremely dusty, dirty conditions.
2Have a Kohler Engine Service Dealer perform these services.
Every 2 Years or
Every 1000 Hours
Check Oil Level
The importance of checking and maintaining the proper
oil level in the crankcase cannot be overemphasized.
Check oil BEF RE EACH USE as follows:
1. Make sure the engine is stopped, level, and is
cool so the oil has had time to drain into the sump.
2. To keep dirt, debris, etc., out of the engine, clean
the area around the dipstick before removing it.
3. Unthread and remove the dipstick; wipe oil off.
Reinsert the dipstick into the tube and rest the oil
fill cap on the tube. Do not thread the cap onto the
tube. See Figure 5. Figure 5. Checking il Level.
4. Pull the dipstick out and check the oil level.
The oil level should be up to, but not over, the
FULL mark on the dipstick. See Figure 6.
 Change engine coolant.

9
Figure 6. il Level Dipstick.
5. If the level is low, add oil of the proper type, up to
the FULL mark on the dipstick. (Refer to Oil
Type on page 4.) Always check the level with the
dipstick before adding more oil.
NOTE: To prevent extensive engine wear or
damage, always maintain the proper oil
level in the crankcase. Never operate the
engine with the oil level below the ADD
mark or over the FULL mark on the
dipstick.
il Sentry
Some engines are equipped with an optional Oil
Sentry oil pressure switch. If the oil pressure
decreases below an acceptable level, the Oil Sentry
will either shut off the engine or activate a warning
signal, depending on the application.
NOTE: Make sure the oil level is checked BEF RE
EACH USE and is maintained up to the
FULL mark on the dipstick. This includes
engines equipped with Oil Sentry.
Change Oil and Filter
Change the oil and oil filter every 200 hours or
annually, whichever comes first (more often under
severe conditions). Refill with service class SG, SH, SJ
or higher oil, as specified in the Viscosity Grades
table (Figure 2) on page 4. Always use a genuine
Kohler oil filter, Part No. 52 050 02-S.
Change the oil while the engine is still warm. The oil
will flow more freely and carry away more impurities.
Make sure the engine is level when filling, checking, or
changing the oil.
Change the oil and oil filter as follows (see Figure 7):
1. To keep dirt, debris, etc., out of the engine, clean
the area around the oil fill cap/dipstick before
removing it.
2. Remove one of the oil drain plugs and the oil fill
cap/dipstick. Be sure to allow ample time for
complete drainage.
3. Before removing the oil filter, clean the area
around the oil filter to keep dirt and debris out of
the engine. Remove the old filter and wipe off the
filter adapter with a clean cloth.
4. Reinstall the drain plug. Make sure it is tightened
to 13.6 N·m (10 ft. lb.) torque.
5. Place a new replacement filter in a shallow pan
with the open end up. Pour new oil, of the proper
type, in through the threaded center hole. Stop
pouring when the oil reaches the bottom of the
threads. Allow a minute or two for the oil to be
absorbed by the filter material.
6. Put a drop of oil on your fingertip and wipe it on
the rubber gasket of the new oil filter.
7. Install the new oil filter to the filter adapter. Hand
tighten the filter clockwise until the rubber gasket
contacts the adapter, then tighten the filter an
additional 2/3 to 1 turn.
8. Fill the crankcase with new oil of the proper type,
to the FULL mark on the dipstick. Refer to Oil
Type and Check Oil Level on pages 4 and 8.
Always check the level with the dipstick before
adding more oil.
9. Reinstall the oil fill cap/dipstick and tighten
securely by turning to the right.
perating
Range
"Full" Mark
Figure 7. il Drain Plugs and il Filter.
il Drain Plug
il
Filter il Drain Plug

10
Cooling System Maintenance and Service
Important service notes:
 Do not operate the engine without coolant in
system.
 Do not remove the radiator cap when hot. Engine
coolant is hot and under pressure and can cause
severe burns.
 To prevent engine overheating and damage, use
the recommended anti-freeze mixture in the
cooling system.
 To prevent engine damage, do not pour cold water
into a hot engine.
 To prevent engine damage, do not use anti-freeze
with stop-leak additive(s) or put other additives in
the cooling systems.
 Cooling system capacity is approximately 1.4 L
(1.47 qt.).
Maintenance
This engine is liquid-cooled, circulating a mixture of
ethylene glycol and water for dependable operation. A
pump is used to circulate the coolant through the
system and radiator. A thermostat contained in the
system assures automatic temperature control and
rapid warm-up. Correct coolant level and cleaning any
debris accumulation from the inlet screen and radiator
surfaces are critical to insuring long life, proper system
performance, and preventing overheating. Check the
coolant level in the overflow reservoir, and clean away
any debris accumulation daily or before each use. At
the same time, inspect the hoses and all connections
for signs of leakage.
Servicing
Engine coolant should be changed every 2 years or
every 1000 hours, whichever comes first. When
changing the engine coolant, the system should also
be flushed to remove any contaminants left behind
during draining. Following are recommended
procedures for checking, draining, flushing, and filling
the cooling system.
Checking Coolant Level
The coolant level should be checked at the overflow
reservoir, located under the upper blower housing
assembly.
1. Unhook the retaining straps and remove the upper
blower housing and screen assembly. See Figures
8 and 9.
Figure 8. Unhooking Retaining Straps.
Figure 9. Removing Upper Blower Housing and
Screen Assembly.
2. Check the coolant level within the overflow
reservoir. Coolant level should be between the
Max. Level and Min. Level marks on the
reservoir. See Figure 10. Do not operate the
engine with the coolant level below the Min.
Level mark.
Add coolant to the overflow reservoir as required.
Use equal parts of ethylene glycol and water only
(distilled or deionized water is recommended).
Figure 10. Coolant Levels on Reservoir.

11
Draining Cooling System
1. Stop the engine and allow it to cool sufficiently.
2. Unhook the four retainer straps, and remove the
upper blower housing and screen assembly. See
Figures 8 and 9.
3. Check if the radiator is cool to the touch. Slowly
loosen the radiator cap to the first stop and allow
any pressure to bleed off. Then loosen it fully and
remove it.
Figure 13. Loosening Screws.
6. Remove the reservoir cap. Carefully tip the
bracket away from the reservoir, and lift the
reservoir out between the bracket and fan. See
Figures 14 and 15. Pour out the contents of the
reservoir and wash out or clean as required.
Dispose of all the old coolant properly, according
to local regulations.
Figure 14. Tipping Bracket Away after Removing
Reservoir Cap.
Loosen Screws
Figure 15. Removing Reservoir.
Figure 11. Removing Radiator Cap.
4. Locate and remove the coolant drain plug in the
lower side of both cylinder heads. See Figure 12.
Drain the coolant into a suitable container. After
the coolant has drained, apply pipe sealant with
Tef lo n® (not Teflon® tape) to the threads and
reinstall the plugs. Torque the plugs to 13.5 N·m
(120 in. lb.).
Figure 12. Location of Coolant Drain Plugs.
5. The coolant overflow reservoir has 3 molded
protrusions (1 upper, 2 lower, see Figure 14) that
fit into corresponding holes in the support
brackets. Loosen the two screws that fasten the
upper bracket to the radiator. See Figure 13.
Coolant Drain Plugs
Molded Protrusion
for Mounting

12
7. Reinstall the reservoir, engaging the two lower
molded protrusions in the mounting holes of the
support bracket. Engage the top bracket around
the upper protrusion. Hold it in this position and
torque the screws to 7.3 N·m (65 in. lb.).
8. Reinstall the reservoir cap. Do not kink/pinch the
hose.
9. Flush the cooling system (see Flushing Cooling
System).
Flushing Cooling System
With system properly drained:
1. Fill the cooling system with clean water and a
cooling system cleaner recommended for
aluminum engines. Follow the directions on the
container.
2. Reinstall and tighten the radiator cap.
3. Reinstall the upper blower housing assembly.
Secure with the retaining straps.
4. Start and run the engine for five minutes, or until it
reaches operating temperature. Stop the engine
and allow it to cool.
5. Remove the upper blower housing and drain the
cooling system (Refer to Draining Cooling
System).
6. Fill the cooling system (see Filling Cooling
System).
7. Reinstall the upper blower housing and screen
assembly.
Filling Cooling System
1. Check the condition of cooling system hoses,
clamps, and associated components. Replace as
required.
2. Mix equal parts of ethylene glycol anti-freeze and
distilled or deionized water (see Coolant
Recommendations on page 5). For extremely
cold temperature applications or protection
outside the limits listed in the Coolant
Recommendations Section, refer to the anti-
freeze manufacturers instructions on the
container, but do not exceed 70% anti-freeze.
3. Fill the radiator with the coolant mixture. Allow
coolant to drain into the lower areas. Fill the
overflow reservoir to a level between the Max.
Level and Min. Level marks. See Figure 10.
Reinstall the radiator and reservoir caps.
4. Reinstall the upper blower housing and screen
assembly. Start and run the engine for five
minutes. Stop the engine and cool.
5. Remove the blower housing and recheck coolant
level in reservoir. Coolant level should be between
the Max. Level and Min. Level marks. Add
coolant to reservoir if required. See Figure 10.
6. Reinstall the upper blower housing and screen
assembly. Secure with the retaining straps.
Service Precleaner and Air Cleaner Element
This engine is equipped with a replaceable, high
density paper air cleaner element surrounded by an
oiled foam precleaner, located under the upper blower
housing. See Figure 16.
Check the air cleaner and air intake screen daily or
before starting the engine. Check for a buildup of dirt
and debris around the air cleaner system. Keep these
areas clean. Also check for loose or damaged
components. Replace all bent or damaged air cleaner
components. Do not operate the engine without the
upper blower housing and screen assembly installed.
NOTE: Operating the engine with loose, damaged, or
missing air intake components can allow
unfiltered air into the engine, causing
premature wear and failure.
Figure 16. Air Cleaner Assembly.
Precleaner Element

13
Service Precleaner
Wash and reoil the precleaner every 25 hours of
operation (more often under extremely dusty or dirty
conditions).
1. Unhook the four retaining straps and remove the
upper blower housing and screen assembly. See
Figures 8 and 9.
2. Remove the foam precleaner from the paper
element. See Figure 17.
Figure 17. Removing Precleaner from Paper
Element.
3. Wash the precleaner in warm water with detergent.
Rinse the precleaner thoroughly until all traces of
detergent are eliminated. Squeeze out excess
water (do not wring). Allow the precleaner to air dry.
4. Saturate the precleaner with new engine oil.
Squeeze out all excess oil.
5. Clean the air cleaner base area, upper blower
housing, and screen assembly of any debris
accumulation. If required, the screen assembly may
also be separated from the upper blower housing
by unsnapping it from the underside. See Figures
18, 19, and 20. Check all parts for wear, cracks, or
damage. Replace any damaged components.
Figure 19. Unsnapping Screen Assembly.
Figure 20. Removing Screen Assembly.
6. Reinstall the precleaner over the paper element,
outside the element retaining strap.
7. Reinstall the upper blower housing and screen
assembly. Secure with the four retaining straps.
8. When precleaner replacement is necessary, order
Kohler Part No. 66 083 03-S.
Service Paper Element
Every 100 hours of operation (more often under
extremely dusty or dirty conditions), replace the paper
element.
1. Unhook the four retaining straps and remove the
upper blower housing and screen assembly. See
Figures 8 and 9.
2. Remove the foam precleaner from the paper
element. See Figure 17. Service or replace the
precleaner.
Figure 18. Clean Away Debris.

14
Clean Air ntake/Cooling Areas
To ensure proper air circulation, make sure the air
intake screen, radiator, cooling fins, and other external
surfaces of the engine are kept clean at all times.
Every 100 hours of operation (more often under
extremely dusty, dirty conditions), remove the upper
blower housing assembly. Clean the cooling fins of the
radiator, external surfaces, and the air intake screen
and blower housing assembly as necessary. The
screen assembly may also be separated from the
upper blower housing to permit more thorough
cleaning if required. See Figures 18, 19, and 20. Make
sure all parts are reinstalled before starting the engine.
If the screen assembly was separated from the blower
housing, push the upper retaining clips into the locked
position.
Clean the cooling fins of the radiator with a soft brush
or blow out using clean, compressed air. See Figure
22. Do not use a high pressure washer to clean, to
avoid damaging the cooling fins.
NOTE: Operating the engine with a blocked air intake
screen, dirty or plugged radiator cooling fins,
and/or cooling shrouds removed, will cause
engine damage due to overheating.
3. Unhook the element retaining strap and remove
the paper element from the air cleaner base. See
Figure 21.
Figure 21. Unhooking Retaining Strap.
4. Do not wash the paper element or use
pressurized air, as this will damage the element.
Replace a dirty, bent, or damaged element with a
new genuine Kohler element. Handle new
elements carefully. Do not use if the sealing
surfaces are bent or damaged.
5. Clean the air cleaner base area, upper blower
housing, and screen assembly of any debris
accumulation. If required, the screen assembly
may also be separated from the blower housing by
unsnapping it from the underside. See Figures 18,
19, and 20. Check all parts for wear, cracks, or
damage. Replace any damaged components.
6. Install the new paper element, Kohler Part No.
66 083 01-S and secure with the element retainer
strap.
7. Install the precleaner over the paper element,
outside the element retaining strap.
8. Reinstall the upper blower housing and screen
assembly. Secure with the four retaining straps.
Figure 22. Clean Radiator Cooling Fins.

15
gnition System
This engine is equipped with an electronic CD ignition
system. Other than periodically checking/replacing the
spark plugs, no maintenance or ad ustments are
necessary or possible with this system.
In the event starting problems should occur which are
not corrected by replacing the spark plugs, see your
Kohler Engine Service Dealer for trouble analysis.
Check Spark Plugs
Annually or every 200 hours of operation (whichever
comes first), remove the spark plugs, check condition,
and reset the gap or replace with new plugs as
necessary. Every 500 hours of operation replace the
spark plugs. The standard spark plug is a Champion®
RC14YC (Kohler Part No. 66 132 01-S). Equivalent
alternate brand plugs can also be used.
1. Before removing the spark plug, clean the area
around the base of the plug to keep dirt and debris
out of the engine.
2. Remove the plug and check its condition. Replace
the plug if worn or reuse is questionable.
NOTE: Do not clean the spark plug in a machine
using abrasive grit. Some grit could
remain in the spark plug and enter the
engine causing extensive wear and
damage.
3. Check the gap using a wire feeler gauge. Ad ust
the gap to 0.76 mm (0.030 in.) by carefully
bending the ground electrode. See Figure 23.
4. Reinstall the spark plug into the cylinder head.
Torque the spark plug to 24.4-29.8 N·m
(18-22 ft. lb.).
Figure 23. Servicing Spark Plug.
Battery Charging
WARNING: Explosive Gas!
Batteries produce explosive hydrogen gas while being
charged. To prevent a fire or explosion, charge
batteries only in well ventilated areas. Keep sparks,
open flames, and other sources of ignition away from
the battery at all times. Keep batteries out of the reach
of children. Remove all jewelry when servicing
batteries.
Before disconnecting the negative (-) ground cable,
make sure all switches are OFF. If O , a spark will
occur at the ground cable terminal which could cause
an explosion if hydrogen gas or gasoline vapors are
present.
NOTE: Do not apply 12 volt DC to kill terminal of
ignition module.
Fuel Filter
Some engines are equipped with an in-line fuel filter.
Periodically inspect the filter and replace when dirty.
Use a genuine Kohler filter, part number 24 050 02-S.
Wire Gauge
Ground
Electrode
Spark Plug
0.76 mm
(0.030 in.) Gap

16
Carburetor Troubleshooting and
Adjustments
In compliance with the government emission
standards, the carburetor is calibrated to deliver the
correct fuel-to-air mixture to the engine under all
operating conditions. The carburetor cannot be
ad usted, except for low idle speed (RPM). Carburetor
servicing is to be performed by an authorized Kohler
Engine Service Dealer only. See Figure 24.
 Make sure fuel is reaching the carburetor. This
includes checking the fuel lines and fuel pump for
restrictions or faulty components, replace as
necessary.
 Make sure the air cleaner element and precleaner
are clean and properly secured.
 Make sure the air intake screen, blower housing,
and cooling surfaces of radiator are clean and free
of dirt and debris.
 Make sure cooling system is filled to the proper
level.
If, after checking the items listed above, the engine is
hard to start, runs roughly, or stalls at low idle speed, it
may be necessary to ad ust or service the carburetor.
Adjust Carburetor
Start the engine and run at half throttle for 5 to 10
minutes to warm up. The engine must be warm before
making final settings.
Low idle speed (RPM) setting:
1. Place the throttle control into the idle or slow
position. Set the low idle speed to 1200 RPM*
(± 75 RPM) by turning the low idle speed ad usting
screw in or out. Check the speed using a
tachometer.
*NOTE: The actual low idle speed depends on the
application  refer to equipment
manufacturers recommendations. The
standard low idle speed is 1200 RPM.
2. If proper operation is not restored after ad usting
the low idle speed, carburetor servicing by an
authorized Kohler Engine Service Dealer may be
required.
Figure 24. Carburetor.
Troubleshooting
If engine troubles are experienced that appear to be
fuel system related, check the following areas before
ad usting the carburetor.
 Make sure the fuel tank is filled with clean, fresh
gasoline.
 Make sure the fuel tank cap vent is not blocked
and that it is operating properly.
 If the fuel tank is equipped with a shut-off valve,
make sure it is open.
 If the engine is equipped with an in-line fuel filter,
make sure it is clean. Replace the filter if it is dirty
or restricted.
Fuel Line
Inlet
Idle Speed
Adjusting Screw
Fuel Shut- ff
Solenoid

17
Dirty Air
Possible Cause No Improper Dirt In Intake creen Incorrect Engine Dirty Air Faulty
Problem Fuel Fuel Fuel Line or Radiator Oil Level Overloaded Cleaner park Plug
Will Not tart  
Hard tarting     
tops uddenly  
Lacks Power 
Operates Erratically   
Knocks or Pings   
kips or Misfires  
Backfires   
Overheats 
High Fuel Consumption 
Troubleshooting
When troubles occur, be sure to check the simple causes which, at first, may seem too obvious to be considered.
For example, a starting problem could be caused by an empty fuel tank. Some common causes of engine troubles
are listed in the following table.
Do not attempt to service or replace ma or engine components, or any items that require special timing or
ad ustment procedures. Have your Kohler Engine Service Dealer do this work.
Storage
If the engine will be out of service for two months or
more, use the following storage procedure:
1. Clean the exterior surfaces of the radiator and
engine.
2. Change the oil and filter while the engine is still
warm from operation. See Change Oil and Filter
on page 9.
3. The coolant (anti-freeze) mixture should be in good
condition and tested to guard against freezing in
cold temperatures. The recommended equal parts
mixture will normally provide protection down to
temperatures of -37° C (-34° F). If storage
temperatures will fall below this, the cooling system
should be drained. A note should then be attached
to the equipment and/or engine as a reminder to
refill the cooling system before starting.
4. The fuel system must be completely emptied, or
the gasoline must be treated with a stabilizer to
prevent deterioration. If you choose to use a
stabilizer, follow the manufacturers
recommendations, and add the correct amount for
the capacity of the fuel system. Fill the fuel tank
with clean, fresh gasoline. Run the engine for 2-3
minutes to get stabilized fuel into the carburetor.
Close fuel shut-off valve when unit is being stored
or transported.
To empty the system, run the engine until the tank
and system are empty.
5. Remove the spark plugs. Add one tablespoon of
engine oil into each spark plug hole. Install plugs,
but do not connect the plug leads. Crank the
engine two or three revolutions.
6. Store the engine in a clean, dry place.
Parts Ordering
The engine Specification, Model, and Serial Numbers
are required when ordering replacement parts from
your Kohler Engine Service Dealer. These numbers are
found on the identification plate which is affixed to the
engine shrouding. Include letter suffixes if there are
any. See Engine Identification Numbers on page 5.
Always insist on genuine Kohler parts. All genuine
Kohler parts meet strict standards for fit, reliability, and
performance.
Major Repair
Ma or repair information is available in Kohler Engine
Service Manuals. However, ma or repair generally
requires the attention of a trained mechanic and the
use of special tools and equipment. Your Kohler
Engine Service Dealer has the facilities, training, and
genuine Kohler replacement parts necessary to
perform this service. For Sales & Service assistance
call 1-800-544-2444 (U.S. & Canada) or contact your
Kohler Engine Dealer or Service Distributor, they're in
the Yellow Pages under Engines-Gasoline.

18
Specifications
Model ................................................................................................ LV625 .................................................. LV675
Bore ..................................................... in. (mm) .............................. 3.03 (77) .............................................. 3.15 (80)
Stroke ................................................... in. (mm) .............................. 2.64 (67) .............................................. 2.64 (67)
Displacement ........................................in3 (cm3) .............................. 38.1 (624) ............................................ 41.1 (674)
Power (@3600 RPM) ........................... HP (kW) .............................. 20* (14.9) ............................................ 23* (17.2)
Max. Torque ....................... ft. lb. (N·m) @ RPM .............................. 32.8 (44.5) @1800 .............................. 38.5 (52.2) @2600
Compression Ratio ........................................................................... 8.5 1 .................................................... 8.5 1
Dry Weight ............................................. lb. (kg) .............................. 108 (49) ............................................... 108 (49)
Oil Capacity (w/filter) ...................... U.S. qts. (L) .............................. 2.0 (1.9) ............................................... 2.0 (1.9)
Lubrication .......................................................... Full Pressure w/full Flow Filter
Coolant/Anti-Freeze ........... U.S. qts. (L) ............ Equal Parts of Water and Ethylene Glycol 1.47 (1.4)
Exhaust Emission Control System for models LV625 and LV675 is EM.
*Horsepower ratings are established in accordance with Society of Automotive Engineers  Small Engine Test Code J1995
GROSS. Kohler Co. reserves the right to change product specifications, design, and standard equipment without notice and
without incurring obligation.
L M TED 3 YEAR KOHLER® AEG S ENG NE WARRANTY
We warrant to the original consumer that each new KOHLER® AEGIS engine sold by us will be free from manufacturing defects in
materials or workmanship in normal service for a period of three (3) years from date of purchase, provided if is operated and maintained
in accordance with Kohler Co.s instructions and manuals.
Our obligation under this warranty is expressly limited, at our option, to the replacement or repair at Kohler Co., Kohler, Wisconsin 53044,
or at a service facility designated by us of such parts as inspection shall disclose to have been defective.
EXCLUSIONS:
Mufflers on engines used commercially (non-residential) are warranted for one (1) year from date of purchase, except catalytic mufflers,
which are warranted for two (2) years.
This warranty does not apply to defects caused by casualty or unreasonable use, including faulty repairs by others and failure to provide
reasonable and necessary maintenance.
The following items are not covered by this warranty:
Engine accessories such as fuel tanks, clutches, transmissions, power-drive assemblies, and batteries, unless supplied or installed by
Kohler Co. These are subject to the warranties, if any, of their manufacturers.
WE SHALL NOT BE LIABLE OR SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES O ANY KIND, including but
not limited to labor costs or transportation charges in connection with the repair or replacement of defective parts.
ANY IMPLIED OR STATUARY WARRANTIES, INCLUDING WARRANTY O MERCHANTABILITY OR ITNESS OR A PARTICULAR
PURPOSE, ARE EXPRESSLY LIMITED TO THE DURATION O THIS WRITTEN WARRANTY. We make no other express warranty, nor
is any one authorized to make any in our behalf.
Some states do not allow limitations on how long an implied warranty lasts, or the exclusion or limitation of incidental or consequential
damages, so the above limitation or exclusion may not apply to you.
This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
TO OBTAIN WARRANTY SERVICE:
Purchaser must bring the engine to an authorized Kohler service facility. or the facility nearest you, consult your Yellow Pages or write
Kohler Co., Attn: Engine Warranty Service Dept., Kohler, Wisconsin, 53044.
ENGINE DIVISION, KOHLER CO., KOHLER, WISCONSIN 53044

19
KOHLER CO.
FEDERAL AND CAL FORN A EM SS ON CONTROL SYSTEMS
L M TED WARRANTY
SMALL OFF-ROAD ENG NES
The U.S. Environmental Protection Agency (EPA), the California Air Resources Board (CARB), and Kohler Co. are pleased to explain the
ederal and California Emission Control Systems Warranty on your small off-road equipment engine. or California, engines produced in
1995 and later must be designed, built and equipped to meet the states stringent anti-smog standards. In other states, 1997 and later
model year engines must be designed, built and equipped, to meet the U.S. EPA regulations for small non-road engines. The engine must
be free from defects in materials and workmanship which cause it to fail to conform with U.S. EPA standards for the first two years of
engine use from the date of sale to the ultimate purchaser. Kohler Co. must warrant the emission control system on the engine for the
period of time listed above, provided there has been no abuse, neglect or improper maintenance.
The emission control system may include parts such as the carburetor or fuel injection system, the ignition system, and catalytic converter.
Also included are the hoses, belts and connectors and other emission related assemblies.
Where a warrantable condition exists, Kohler Co. will repair the engine at no cost, including diagnosis (if the diagnostic work is performed at
an authorized dealer), parts and labor.
MANUFACTURERS WARRANTY COVERAGE
Engines produced in 1995 or later are warranted for two years in California. In other states, 1997 and later model year engines are
warranted for two years. If any emission related part on the engine is defective, the part will be repaired or replaced by Kohler Co. free of
charge.
OWNERS WARRANTY RESPONSIBILITIES
(a) The engine owner is responsible for the performance of the required maintenance listed in the owners manual. Kohler Co.
recommends that you retain all receipts covering maintenance on the engine, But Kohler Co. cannot deny warranty solely for the lack
of receipts or for your failure to assure that all scheduled maintenance was performed.
(b) Be aware, however, that Kohler Co. may deny warranty coverage if the engine or a part has failed due to abuse, neglect, improper
maintenance or unapproved modifications.
(c) or warranty repairs, the engine must be presented to a Kohler Co. service center as soon as a problem exists. Call
1-800-544-2444 or access our web site at: www.kohlerengines.com for the names of the nearest service centers. The warranty
repairs should be completed in a reasonable amount of time, not to exceed 30 days.
If you have any questions regarding warranty rights and responsibilities, you should contact Kohler Co. at 1-920-457-4441 and ask for an
Engine Service representative.
COVERAGE
Kohler Co. warrants to the ultimate purchaser and each subsequent purchaser that the engine will be designed, built and equipped, at the
time of sale, to meet all applicable regulations. Kohler Co. also warrants to the initial purchaser and each subsequent purchaser, that the
engine is free from defects in materials and workmanship which cause the engine to fail to conform with applicable regulations for a period
of two years.
Engines produced in 1995 or later are warranted for two years in California. or 1997 and later model years, EPA requires manufacturers to
warrant engines for two years in all other states. These warranty periods will begin on the date the engine is purchased by the initial
purchaser. If any emission related part on the engine is defective, the part will be replaced by Kohler Co. at no cost to the owner. Kohler
Co. is liable for damages to other engine components caused by the failure of a warranted part still under warranty.
Kohler Co. shall remedy warranty defects at any authorized Kohler Co. engine dealer or warranty station. Warranty repair work done at an
authorized dealer or warranty station shall be free of charge to the owner if such work determines that a warranted part is defective.
Listed below are the parts covered by the ederal and California Emission Control Systems Warranty. Some parts listed below may require
scheduled maintenance and are warranted up to the first scheduled replacement point for that part. The warranted parts are:
Oxygen sensor (if equipped) Ignition module(s) with high tension lead
Intake manifold (if equipped) Gaseous fuel regulator (if equipped)
Exhaust manifold (if equipped) Electronic control unit (if equipped)
Catalytic muffler (if equipped) Carburetor or fuel injection system
uel metering valve (if equipped) uel lines (if equipped)
Spark advance module (if equipped) Air filter, fuel filter, and spark plugs (only
Crankcase breather to first scheduled replacement point)
Continued on next page.

LIMITATIONS
This Emission Control Systems Warranty shall not cover any of the following:
(a) repair or replacement required because of misuse or neglect, improper maintenance, repairs improperly performed or replacements
not conforming to Kohler Co. specifications that adversely affect performance and/or durability and alterations or modifications not
recommended or approved in writing by Kohler Co.,
(b) replacement of parts and other services and adjustments necessary for required maintenance at and after the first scheduled
replacement point,
(c) consequential damages such as loss of time, inconvenience, loss of use of the engine or equipment, etc.,
(d) diagnosis and inspection fees that do not result in eligible warranty service being performed, and
(e) any add-on or modified part, or malfunction of authorized parts due to the use of add-on or modified parts.
MAINTENANCE AND REPAIR REQUIREMENTS
The owner is responsible for the proper use and maintenance of the engine. Kohler Co. recommends that all receipts and records covering
the performance of regular maintenance be retained in case questions arise. If the engine is resold during the warranty period, the
maintenance records should be transferred to each subsequent owner. Kohler Co. reserves the right to deny warranty coverage if the
engine has not been properly maintained; however, Kohler Co. may not deny warranty repairs solely because of the lack of repair
maintenance or failure to keep maintenance records.
Normal maintenance, replacement or repair of emission control devices and systems may be performed by any repair establishment or
individual; however, warranty repa rs must be performed by a Kohler author zed serv ce center. Any replacement part or service that is
equivalent in performance and durability may be used in non-warranty maintenance or repairs, and shall not reduce the warranty obligations
of the engine manufacturer.
ENGINE DIVISION, KOHLER CO., KOHLER, WISCONSIN 53044
FOR SALES AND SERVICE INFORMATION
IN U.S. AND CANADA, CALL
1-800-544-2444
LITHO IN U.S.A.
ORM NO.: TP-2507-B
ISSUED: 1/00
REVISED: 12/01
MAILED: