Kohler Aegis LV625 / LV675 / LV680 Manual

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.

Oil 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.

*Use of synthetic oil having 5W-20 or 5W-30 rating is acceptable, up to 4°C (40°F).
**Synthetic oils will provide better starting in extreme cold below 23°C (-10°F).

NOTE: Using other than service class SG, SH, SJ or higher oil or extending oil change intervals longer than recommended can cause engine damage.
NOTE: Synthetic oils meeting the listed classifications may be used with oil changes performed at the recommended intervals. However to allow piston rings to properly seat, a new or rebuilt engine should be operated for at least 50 hours using standard petroleum based oil before switching to synthetic oil.

A logo or symbol on oil containers identifies the API service class and SAE viscosity grade. See Figure 3.

Figure 3. Oil Container Logo.
Refer to "Maintenance Instructions" beginning for detailed oil check, oil change, and oil filter change procedures.

Fuel Recommendations

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. Never 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 ensure easy starting.
Do not add oil to the gasoline. Do not overfill the fuel tank. Leave room for the fuel to expand.

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 Identification 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)
Refer to certification label for engine displacement.
Exhaust Emission Control System for models LV625, LV675, and LV680 is EM.

Model Designation

Model LV625 for example: L designates liquid cooled, V designates vertical crankshaft, and 625 is the model designation. A letter suffix designates a specific version as follows:

Operating Instructions

Also read the operating instructions of the equipment this engine powers.

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.

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'').
2. Be sure to use the proper oil for the temperature expected. See Figure 2.
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 leak down 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 jump start using another battery (refer to "Battery"). 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.

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.

Operating
Angle of Operation
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''.

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''.
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.

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. Never 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.

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.

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.

¹Perform these maintenance procedures more frequently under extremely dusty, dirty conditions.
²Only required for Denso starters. Not necessary on Delco starters. Have a Kohler Engine Service Dealer perform this service.

Check Oil Level
The importance of checking and maintaining the proper oil level in the crankcase cannot be overemphasized. Check oil BEFORE 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 Oil 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.
   Figure 6. Oil 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") 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.

Oil 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 BEFORE 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). 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):
Figure 7. Oil Drain Plugs and Oil Filter.

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. Apply a thin film of clean oil to the rubber gasket on the new filter.
7. Install the new oil filter to the filter adapter. Handt ighten 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''. 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.

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.
   

Draining Cooling System

1. Stop the engine and allow it to cool sufficiently.
2. Unhook the four retaining 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 fully loosen and remove it.
   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 Teflon^® (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.
   Figure 13. Loosening Screws.
   
6. Remove the reservoir cap. Carefully tip thebracket 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.
   
   Figure 15. Removing Reservoir.
   
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 CoolingSystem'').

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 CoolingSystem'').
7. Reinstall the upper blower housing and screena ssembly.

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''). For extremely cold temperature applications or protection outside the limits listed in the ''Coolant Recommendations'' Section, refer to the antifreeze 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.

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 18. Clean Away Debris.
   
   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.
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.

Clean Air Intake/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.
Figure 22. Clean Radiator Cooling Fins.

Ignition System
This engine is equipped with an electronic CD ignition system. Other than periodically checking/replacing the spark plugs, no maintenance or adjustments 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. Adjust the gap to0.76 mm (0.030 in.) by carefully bending the ground electrode. See Figure 23.
   Figure 23. Servicing Spark Plug.
   
4. Reinstall the spark plug into the cylinder head.
   Torque the spark plug to 24.4-29.8 N·m (18-22 ft. lb.).

Battery Charging

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 ON, 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
Most engines are equipped with an in-line fuel filter. Periodically inspect the filter and replace every 200 operating hours. Use a genuine Kohler filter, Part No. 24 050 02-S.

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 adjusted, except for low idle speed (RPM). Carburetor servicing is to be performed by an authorized Kohler Engine Service Dealer only. See Figure 24.
Figure 24. Carburetor.

Troubleshooting
If engine troubles are experienced that appear to be fuel system related, check the following areas before adjusting 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.

• 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 adjust 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 adjusting 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 adjusting the low idle speed, carburetor servicing by an authorized Kohler Engine Service Dealer may be required.

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 major engine components, or any items that require special timing or adjustment procedures. Have your Kohler Engine Service Dealer do this work.

Problem\Possible Cause	No Fuel	Improper Fuel	Dirt In Fuel Line	Dirty Air Intake Screen or Radiator	Incorrect Oil Level	Engine Overloaded	Dirty Air Cleaner	Faulty Spark Plug
Will Not Start
Hard Starting
Stops Suddenly
Lacks Power
Operates Erratically
Knocks or Pings
Skips or Misfires
Backfires
Overheats
High Fuel Consumption

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".
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".
Always insist on genuine Kohler parts. All genuine Kohler parts meet strict standards for fit, reliability, and performance.

Major Repair

Major repair information is available in Kohler Engine Service Manuals. However, major 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.

Specifications

Exhaust Emission Control System for models LV625, LV675, and LV680 is EM.

*Horsepower ratings exceed Society of Automotive Engineers Small Engine Test Code J1940. Actual engine horsepower is lower and affected by, but not limited to, accessories (air cleaner, exhaust, charging, cooling, fuel pump, etc.), application, engine speed and ambient operating conditions (temperature, humidity, and altitude). Kohler reserves the right to change product specifications, designs and equipment without notice and without incurring obligation.