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Kohler KT735 - User Manual

Kohler KT735
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132 690 03 Rev. I KohlerEngines.com
Service Manual
2 Safety
3 Maintenance
5 Specifi cations
21 Tools and Aids
24 Troubleshooting
28 Air Cleaner/Intake
30 Fuel System
49 Governor System
50 Lubrication System
52 Electrical System
59 Starter System
63 Emission Compliant Systems
66 Disassembly/Inspection and Service
79 Reassembly
IMPORTANT: Read all safety precautions and instructions carefully before operating equipment. Refer to operating
instruction of equipment that this engine powers.
Ensure engine is stopped and level before performing any maintenance or service.
KT610-KT620, KT715-KT745

Table of Contents

Questions and Answers

  • L
    Lisa WeeksSep 9, 2025
    Why is my Kohler KT735 Engine overheating?
    • M
      Michael ScottSep 9, 2025
      If your Kohler Engine overheats, several factors could be responsible. Start by replacing the cooling fan if it's broken. Reduce the engine load if it's excessive. Inspect and replace the fan belt if it has failed or is off. Inspect and replace the carburetor if it's faulty. Check and adjust the crankcase oil level if it's high. Adjust the fuel mixture if it's lean. Check and refill the cooling system fluid if the level is low. Also, check and refill the crankcase oil if the level is low. Inspect and clear any clogs or restrictions in the radiator and cooling system components. Replace the water pump belt if it has failed or broken. Lastly, inspect and replace the water pump if it's malfunctioning.
  • M
    Melissa MoranAug 23, 2025
    Why Kohler Engine Cranks But Will Not Start?
    • A
      Andrea GreenAug 23, 2025
      Your Kohler engine might crank but fail to start due to several reasons: a backwards battery connection, a blown fuse, a malfunctioning carburetor solenoid, the choke not closing, a clogged fuel line or filter, a failed diode in the wiring harness, a DSAI or DSAM malfunction, an empty fuel tank, a faulty electronic control unit, faulty ignition coils or spark plugs, a fuel pump malfunction (clogged or leaking vacuum hose), a closed fuel shut-off valve, faulty or improperly gapped ignition modules, insufficient voltage to the electronic control unit, an engaged or faulty interlock switch, the key or kill switch being in the OFF position, a low oil level, poor fuel quality (dirt, water, stale, or improper mixture), a SMART-SPARK™ malfunction, or disconnected spark plug leads.
  • A
    Alex DavenportSep 6, 2025
    How to fix Kohler KT735 Runs But Misses?
    • G
      gnelsonSep 6, 2025
      If your Kohler engine runs but misses, possible causes include an incorrectly adjusted carburetor, engine overheating, faulty spark plugs, faulty or improperly gapped ignition modules, an incorrect crankshaft position sensor air gap, an engaged or faulty interlock switch, loose wires intermittently grounding the ignition kill circuit, poor fuel quality (dirt, water, stale, or improper mixture), disconnected spark plug leads, a loose spark plug lead boot on the plug, or a loose spark plug lead.
  • B
    Beverly MartinSep 4, 2025
    How to troubleshoot Kohler Engine Starts Hard?
    • R
      robertsstevenSep 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.
  • D
    Daniel KleinSep 3, 2025
    What to do if my Kohler KT735 stops suddenly?
    • J
      jmarshSep 3, 2025
      If your Kohler Engine stops suddenly, do not attempt to service or replace major engine components, or any items that require special timing or adjustment procedures. This work should be performed by a Kohler authorized dealer.
  • T
    Thomas GutierrezSep 2, 2025
    Why Kohler KT735 uses excessive amount of oil?
    • J
      James DavisSep 2, 2025
      If your Kohler Engine uses an excessive amount of oil, several issues could be responsible. Loose or improperly torqued fasteners can cause oil consumption, so tighten or replace them. Inspect and replace the head gasket if it's blown or if the engine overheated. Inspect and replace the breather reed if it's broken. Inspect and repair the crankcase breather if it's clogged, broken, or inoperative. Drain excess oil from the crankcase if it's overfilled. Use the correct oil viscosity/type. Inspect and repair the cylinder bore if it's worn. Inspect and replace the piston rings if they are worn or broken. Inspect and replace the valve stems/valve guides if they are worn.
  • C
    Cheryl FreemanAug 31, 2025
    How to troubleshoot Kohler KT735 that will not idle?
    • J
      John GarrisonSep 1, 2025
      If your Kohler Engine will not idle, it could be due to several factors. If the engine overheated, allow it to cool down. Inspect and replace the spark plug(s) if they are faulty. Adjust the idle fuel needle(s) if they are improperly set. Adjust the idle speed screw if it's improperly set. Ensure there is an adequate fuel supply. Inspect the engine for compression issues if compression is low. Replace the fuel with fresh quality fuel. Clean or replace the fuel tank cap if the vent is restricted.
  • B
    Brian ThorntonAug 30, 2025
    What to do if Kohler KT735 Engine runs but misses?
    • M
      marysimmonsAug 30, 2025
      If your Kohler Engine runs but misses, it could be due to several reasons: The carburetor might be adjusted incorrectly, so adjust it properly. If the engine has overheated, allow it to cool down. Inspect and replace the spark plug(s) if they are faulty. Inspect and correctly gap the ignition module(s) if they are faulty or improperly gapped. Check and adjust the crankshaft position sensor air gap if it's incorrect. 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. Replace the fuel with fresh quality fuel. Reconnect any disconnected spark plug leads. Secure the spark plug lead boot if it's loose on the plug. Finally, tighten any loose spark plug leads.
  • J
    Janice FosterAug 29, 2025
    Why Kohler KT735 Engine starts hard?
    • M
      Micheal SmithAug 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.
  • C
    Christopher BurnettAug 27, 2025
    What causes Kohler KT735 will not crank?
    • A
      Andrea GalvanAug 28, 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.

Kohler KT735 Specifications

General IconGeneral
Compression Ratio9.1:1
Fuel SystemCarburetor
Cooling SystemAir-cooled
Ignition SystemElectronic
StarterElectric
Displacement725 cc
Power24 hp
LubricationFull Pressure
Horsepower24 hp
Oil Capacity2 U.S. quarts
Dry Weight85 lbs

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