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8 32 590 23 Rev. --KohlerEngines.com
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.
Possible Cause
Problem
No
Fuel
Improper
Fuel
Dirt In
Fuel
Line
Dirty
Debris
Screen
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 Misfi res
●●● ● ●
Backfi res
●● ● ● ●
Overheats
●●●● ● ●
High Fuel
Consumption
●●●
Engine Specifi cations
Model Bore Stroke Displacement
Oil Capacity
(Refi ll)
Spark
Plug Gap
Maximum Angle
of Operation
(@ full oil level)*
KT610
3.27 in.
(83 mm)
2.4 in.
(61 mm)
40.3 cu. in.
(660 cc)
2.0 U.S. qt.
(1.9 L)
0.030 in.
(0.76 mm)
25°
KT620
KT715
2.6 in.
(67 mm)
44.2 cu. in.
(725 cc)
KT725
KT730
KT735
KT740**
KT745
2.7 in.
(69 mm)
45.6 cu. in.
(747 cc)
*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.
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.
Emission Control System
Exhaust Emission Control System for models KT610-KT620, KT715-KT745 is EM for U.S. EPA,
California, and Europe.
NOTE: Tampering with the engine and its emission control system voids the EPA Certifi cate of
Conformity, ARB Executive Order, and EU type-approval.