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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 Misfires
Backfires
Overheats
High Fuel
Consumption
Engine Specifications
Model
Bore
ECH630
ECV630
ECH650
3.2 in.
(80 mm)
ECV650
ECH680
ECV680
ECH730
ECV730
ECH740
ECV740
ECH749
3.27 in.
(83 mm)
ECV749
CH735/CH26
CV735
CH745
CV745
*Exceeding maximum angle of operation may cause engine damage from insufficient lubrication.
Additional specification information can be found in service manual at KohlerEngines.com.
Exhaust Emission Control System for models ECH630-ECH749, ECV630-ECV749, CH735/CH26,
CH745, CV735, and CV745 is EM, O2S, ECM, MPI for U.S. EPA, California, and Europe.
Any and all horsepower (hp) references by Kohler are Certified Power Ratings and per SAE J1940
& J1995 hp standards. Details on Certified Power Ratings can be found at KohlerEngines.com.
8
No
Improper
Dirt In
Fuel
Fuel
Fuel Line
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Stroke Displacement Oil Capacity
42.4 cu. in.
(694 cc)
2.72 in.
(69 mm)
45.6 cu in.
(747 cc)
2.6 in.
44.2 cu. in.
(67 mm)
(725 cc)
KohlerEngines.com
Possible Cause
Broken
Dirty
Fusible
Debris
Incorrect
Link
Screen
Oil Level
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(Refill)
1.7-2.0 U.S. qt.
(1.6-1.9 L)
Engine
Dirty Air
Overload
Cleaner
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Maximum Angle
Spark Plug
of Operation
Gap
(@ full oil level)*
0.03 in.
(0.76 mm)
24 590 33 Rev. --
Faulty
Spark
Plug
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25°
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