Kohler KT740 - Service Manual

Questions and Answers

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Stephen MclaughlinNov 21, 2025
How to fix Kohler Engine when it cranks but will not start?
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  Christopher BautistaNov 21, 2025
  If your Kohler Engine cranks but doesn't start, several factors could be at play. First, check if the fuel tank is empty and refill it if needed. Ensure the fuel shut-off valve is open. Inspect the choke to make sure it is closing properly. Examine the battery connections and reconnect if connected backwards. Replace the fuse if it's blown. Also, verify that the key switch or kill switch is in the ON position. Low oil level can also prevent starting, so check and refill if necessary. Replace the fuel with fresh quality fuel to eliminate issues with fuel quality. If these steps don't resolve the issue, further inspection of components like the carburetor solenoid, fuel line or filter, diode in the wiring harness, DSAI or DSAM, electronic control unit, ignition coil(s), spark plug(s), fuel p...
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Alex JohnsonAug 25, 2025
Why Kohler Engine loses power?
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  tara24Aug 26, 2025
  If your Kohler Engine loses power, start by cleaning or replacing the air cleaner element. Ensure the engine isn't overheating by allowing it to cool down. Reduce the engine load if it's excessive. Inspect and clear any restrictions in the exhaust system. Check and replace the spark plug(s) if faulty. Verify and adjust the crankcase oil level if it's too high. Adjust the governor setting if it's incorrect. If the battery is low, charge or replace it. Inspect the engine for compression issues if compression is low. Check and refill the crankcase oil if the level is low. Finally, replace the fuel with fresh quality fuel to rule out fuel issues.
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scott55Aug 27, 2025
What to do if Kohler KT740 starts but does not keep running?
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  michael17Aug 27, 2025
  If your Kohler Engine starts but doesn't keep running, there are several possible causes. A faulty carburetor could be the issue, so inspect and replace it if necessary. Also, a faulty cylinder head gasket can cause this problem, requiring replacement. Adjust the choke or throttle controls if they are faulty or misadjusted. Inspect the fuel pump and hoses for any malfunctions or clogs. Look for intake system leaks and repair them. Loose wires or connections that intermittently ground the ignition kill circuit can also be the cause, so tighten them. Replace the fuel with fresh quality fuel to ensure fuel quality isn't the problem. Lastly, clean or replace the fuel tank cap if the vent is restricted.
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Monica WaltonAug 27, 2025
What causes Kohler Engine will not crank?
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  Jose DayAug 27, 2025
  If your Kohler Engine will not crank, it could be due to several reasons. The battery might be discharged, so try charging or replacing it. Inspect and replace the electric starter or solenoid if they are faulty. Check and replace the key switch or ignition switch if they are faulty. Make sure the interlock switch is not engaged or faulty. Tighten any loose wires or connections that might be grounding the ignition kill circuit. Check the pawls engagement. Finally, inspect the engine for seized components.
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Gary StrongAug 29, 2025
Why Kohler Engine starts hard?
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  Peter CantrellAug 29, 2025
  If your Kohler Engine starts hard, consider these potential causes: a clogged fuel line or fuel filter, which you should clean or replace. If the engine overheated, allow it to cool down. Inspect and replace the ACR mechanism if it's faulty. Adjust the choke or throttle controls if they are faulty or misadjusted. Inspect and replace the spark plug(s) if they are faulty. Replace the flywheel key if it's sheared. Inspect the fuel pump and hoses for any malfunctions. Check the interlock switch to ensure it is not engaged or faulty. Tighten any loose wires or connections that might be grounding the ignition kill circuit. Inspect the engine for compression issues if compression is low. Replace the fuel with fresh quality fuel. Finally, inspect the ignition system for a weak spark.
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Christina ShafferSep 18, 2025
What causes Kohler KT740 Will Not Idle?
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  Christopher WongSep 18, 2025
  If your Kohler engine will not idle, it could be due to the engine overheating, faulty spark plugs, improperly set idle fuel adjusting needles or idle speed adjusting screw, inadequate fuel supply, low compression, poor fuel quality (dirt, water, stale, or improper mixture), or a restricted fuel tank cap vent.
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Trevor LeeSep 16, 2025
Why Kohler KT740 Knocks?
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  richardonealSep 16, 2025
  A knocking sound in your Kohler engine can be caused by excessive engine load, hydraulic lifter malfunction, incorrect oil viscosity/type, internal wear or damage, low crankcase oil level, or poor fuel quality (dirt, water, stale, or improper mixture).
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vporterSep 17, 2025
What to do if Kohler KT740 Engine Will Not Crank?
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  Reginald KeithSep 17, 2025
  If your Kohler engine won't crank, it could be due to a discharged battery, a faulty electric starter or solenoid, a faulty key or ignition switch, an engaged or faulty interlock switch, loose wires intermittently grounding the ignition kill circuit, pawls not engaging in the drive cup, or seized internal engine components.
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Shannon WebsterSep 7, 2025
What causes Kohler Engine Uses Excessive Amount of Oil?
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  Christian BarnesSep 7, 2025
  Excessive oil consumption in your Kohler engine could be due to loose or improperly torqued fasteners, a blown head gasket or overheating, a broken breather reed, a clogged or inoperative crankcase breather, an overfilled crankcase, incorrect oil viscosity/type, a worn cylinder bore, worn or broken piston rings, or worn valve stems/valve guides.
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Taylor LoveSep 4, 2025
How to troubleshoot Kohler Engine Starts Hard?
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  jennifer16Sep 5, 2025
  If your Kohler engine starts hard, the issue might stem from a clogged fuel line or fuel filter, the engine overheating, a faulty ACR mechanism, faulty or misadjusted choke or throttle controls, faulty spark plugs, a sheared flywheel key, a fuel pump malfunction (clogged or leaking vacuum hose), an engaged or faulty interlock switch, loose wires intermittently grounding the ignition kill circuit, low compression, poor fuel quality (dirt, water, stale, or improper mixture), or a weak spark.

Summary

Safety

General Safety Precautions

Provides essential safety warnings and cautions for operating and servicing the engine.

Maintenance

Maintenance Instructions and Schedule

Details important instructions, warnings, and recommended maintenance intervals for engine upkeep.

Oil and Fuel Recommendations

Specifies recommended oil types, viscosities, and fuel requirements for optimal engine performance.

Specifications

Engine Dimensions

Provides detailed measurements for engine configurations, covering various air cleaner types and views.

Engine Identification, General Specs, and Torque Values

Lists engine identification, key specifications, and critical torque values for fasteners.

Clearance Specifications

Details essential internal engine component clearances required for proper operation.

Fastener Torque Recommendations

Offers standard torque values for English and Metric fasteners based on grade and size.

Tools and Aids

Recommended Tools and Suppliers

Lists specialized tools and their sources for effective engine servicing.

Specialized Tools for Specific Tasks

Describes custom tools like flywheel holders and spanner wrenches for specific tasks.

Troubleshooting

Troubleshooting Guide and Common Issues

Provides a guide to diagnosing and resolving common engine starting, running, and performance problems.

External Inspection, Cleaning, and Specific Tests

Covers external inspection, cleaning, crankcase vacuum, compression, and leakdown tests.

Air Cleaner;Intake

Air Cleaner Components and Servicing

Details the parts of the air cleaner system and procedures for cleaning and replacing elements.

Air Cleaner Base, Breather Tube, and Air Cooling

Covers air cleaner base removal, breather tube connection, and air cooling system importance.

Fuel System

Fuel Pump and Fuel System Tests

Covers fuel pump performance, replacement, and diagnostic tests for the fuel system.

Carburetor Overview and Troubleshooting

Introduces carburetor types and provides a checklist for common starting and running issues.

Carburetor Causes, Circuits, and Adjustments

Explains causes of engine issues, details carburetor circuits, and covers adjustments.

High Altitude Operation and Carburetor Specifics

Addresses adjustments for high altitudes and specific procedures for Keihin/Walbro carburetors.

Smart-Choke System Overview and Components

Explains the operation and components of the Smart-Choke system for automatic choke control.

Smart-Choke System Troubleshooting

Guides users through diagnosing and resolving issues related to the Smart-Choke system.

Thermostat Procedures

Identifies thermostat types and details procedures for their installation, adjustment, and testing.

Starting Engine with Smart-Choke;eChoke

Provides instructions for starting engines equipped with the Smart-Choke or eChoke systems.

Electronic Choke (eChoke) System Diagnostics

Outlines standard checks, blink codes, operational tests, and failure modes for eChoke system diagnostics.

Governor;Throttle Control and Unitized Control Systems

Illustrates governor/throttle connections and explains unitized throttle/choke controls and starting procedures.

Governor System

Governor Description, Components, and Adjustments

Explains governor function, lists components, and details adjustment procedures.

Lubrication System

Lubrication Components and Oil Check

Identifies lubrication system parts and provides instructions for checking oil level.

Oil and Filter Change Procedure

Details the steps for changing engine oil and filter.

Oil Sentry System Installation and Testing

Describes the function, installation, and testing of the Oil Sentry™ low oil warning system.

Electrical System

Spark Plug Inspection and Service

Covers spark plug inspection, condition diagnosis, and service procedures.

Battery and Ignition System Information

Details battery care, testing, ignition system types, and recommendations.

Ignition System Wiring Diagrams and Testing

Explains ignition systems and provides wiring diagrams, along with testing procedures.

Battery Charging System and Rectifier-Regulator Testing

Explains battery charging systems and provides testing procedures for the rectifier-regulator.

Starter System

Starter Troubleshooting and Difficulties

Guides users through diagnosing and resolving common starter system issues.

Solenoid Shift Starters: Components, Disassembly, and Inspection

Details components, disassembly, and inspection steps for solenoid shift starter systems.

Starter Reassembly and Brush Replacement

Covers armature inspection, starter reassembly, and brush replacement procedures.

Solenoid Tests

Details procedures for testing the starter solenoid's actuation and continuity.

Emission Compliant Systems

Evaporative Emission Control System

Explains the function and maintenance of the evaporative emission control system.

Secondary Emission Compliant System (SAI)

Introduces secondary air induction systems for emission compliance and their operation/maintenance.

Disassembly;Inspection and Service

External Engine Components Removal

Lists steps for removing major external engine components.

Component Removal Procedures

Details removal of spark plugs, oil, muffler, fuel pump, blower housing, baffles, throttle controls, and governor linkages.

Cylinder Head and Valve Train Disassembly

Provides steps for removing valve covers and disassembling cylinder heads, including valve components.

Piston and Rings Inspection and Installation

Covers inspection of pistons and rings, and detailed instructions for installing new piston rings.

Cylinder Bore Honing and Piston-to-Bore Clearance Measurement

Explains cylinder honing and the precise method for measuring piston-to-bore clearance.

Reassembly

General Reassembly Notes and Component Installation

Emphasizes proper assembly techniques, sealants, and installation of various components.

Connecting Rods, Pistons, Rings, and Valve Train Installation

Details the critical steps for installing connecting rods, pistons, rings, and valve train components.

Cylinder Head Installation and Valve Clearance Adjustment

Covers installing cylinder heads and adjusting valve clearances.

Final Component Installation and Engine Preparation

Covers final installations like fuel pump, oil filter, spark plugs, and preparing the engine for operation.

Engine Testing Procedure

Outlines steps for testing the engine after reassembly to ensure proper operation.

Kohler KT740 Specifications

General

Cooling System	Air-cooled
Fuel Type	Gasoline
Fuel System	Carburetor
Displacement	725 cc
Lubrication	Full Pressure
Ignition System	Electronic
Stroke	2.64 in (67 mm)
Power	25 hp