Troubleshooting
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.
Problem
Will Not Start
Hard Starting
Stops Suddenly
Lacks Power
Operates Erratically
Knocks or Pings
Skips or Misfi res
Backfi res
Overheats
High Fuel
Consumption
Engine Specifi cations
Model
Bore
KT610
KT620
KT715
KT725
3.27 in.
KT730
(83 mm)
KT735
KT740**
KT745
*Exceeding maximum angle of operation may cause engine damage from insuffi cient lubrication.
**KT740 engines with PRO Performance Air Cleaner have 45.6 cu. in. (747 cc) Displacement.
Additional specifi cation information can be found in service manual at KohlerEngines.com.
Exhaust Emission Control System for models KT610-KT620, KT715-KT745 is EM for U.S. EPA,
California, and Europe.
Any and all horsepower (hp) references by Kohler are Certifi ed Power Ratings and per SAE J1940
& J1995 hp standards. Details on Certifi ed Power Ratings can be found at KohlerEngines.com.
8
Dirt In
No
Improper
Fuel
Fuel
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Stroke
Displacement
2.4 in.
40.3 cu. in.
(61 mm)
(660 cc)
2.6 in.
44.2 cu. in.
(67 mm)
(725 cc)
2.7 in.
45.6 cu. in.
(69 mm)
(747 cc)
KohlerEngines.com
Possible Cause
Dirty
Fuel
Debris
Incorrect
Line
Screen
Oil Level
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Oil Capacity
(Refi ll)
2.0 U.S. qt.
(1.9 L)
Engine
Dirty Air
Overloaded
Cleaner
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Maximum Angle
Spark
of Operation
Plug Gap
(@ full oil level)*
0.030 in.
(0.76 mm)
32 590 16 Rev. A
Faulty
Spark
Plug
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25°