Specifications; Parts Ordering; Major Repair - Kohler Command CH20 Owner's Manual

Storage
If the engine will be out of service for two months or
more, use the following storage procedure:
1. Clean the exterior surfaces of the engine. On EFI
engines, avoid spraying water at the wiring
harness or any of the electrical components.
2. Change the oil and filter while the engine is still
warm from operation. See Change Oil and Filter
on page 10.
3. The fuel system must be completely emptied, or
the gasoline must be treated with a stabilizer to
prevent deterioration. If you choose to use a
stabilizer, follow the manufacturers
recommendations, and add the correct amount
for the capacity of the fuel system. Fill the fuel
tank with clean, fresh gasoline. Run the engine for
2-3 minutes to get stabilized fuel into the rest of
the system. Close fuel shut-off valve when unit is
being stored or transported.
To empty the system, run the engine until the
tank and fuel system are empty.
4. Remove the spark plugs. Add one tablespoon of
engine oil into each spark plug hole. Install the
plugs, but do not connect the plug leads. Crank
the engine two or three revolutions.

Specifications

Model: ..................................................................... CH18/CH620 ............... CH20/CH640 ............... CH23/CH680
Bore: ............................................ mm (in.) ........... 77 (3.03) ....................... 77 (3.03) ....................... 80 (3.2)
Stroke: ......................................... mm (in.) ........... 67 (2.64) ....................... 67 (2.64) ....................... 67 (2.64)
Displacement: ........................... cm
Power (@ 3600 RPM): ................ kW (HP) ........... 13.4 (18*) ...................... 14.9 (20*) ...................... 17.2 (23*)
Compression Ratio: ............................................. 8.5:1 .............................. 8.5:1 .............................. 8.5:1
Weight: ........................................... kg (lb.) ........... 41 (90) .......................... 41 (90) .......................... 41 (90)
Oil Capacity (w/filter) - approximate,
determined by oil filter and oil cooler used: ---------------------------------- 1.6-1.8 L (1.7-1.9 U.S. qt.) -----------------------------------
Lubrication: ------------------------------------------------ Full Pressure w/full Flow Filter -------------------------------------------------------
Model: ............................................................. CH730 .............. CH26/CH735 ....... CH740 ................ CH745 .................... CH750
Bore: ............................................ mm (in.) ... 83 (3.27) ........... 83 (3.27) ............... 83 (3.27) ............. 83 (3.27) ................. 83 (3.27)
Stroke: ......................................... mm (in.) ... 67 (2.64) ........... 67 (2.64) ............... 67 (2.64) ............. 67 (2.64) ................. 69 (2.72)
Displacement: ........................... cm
Power (@ 3600 RPM): ................ kW (HP) ... 18.6 (25*) .......... 19.4 (26*) .............. 20.1 (27*) ............ 20.9 (28*) ................ 22.4 (30*)
Compression Ratio: ..................................... 9:1 ..................... 9:1 ......................... 9:1 ....................... 9:1 ........................... 9.4:1
Weight: ........................................... kg (lb.) ... 43 (94) .............. 43 (94) .................. 43 (94) ................ 43 (94) .................... 47 (105)
Oil Capacity (w/filter) - approximate,
determined by oil filter and oil cooler used: ---------------------------------- 1.6-1.8 L (1.7-1.9 U.S. qt.) ---------------------------------------
Lubrication: ------------------------------------------------ Full Pressure w/full Flow Filter -----------------------------------------------------------
Exhaust Emission Control System for models CH18/CH620, CH20/CH640, CH23/CH680, CH730, CH740, CH750 is EM.
Exhaust Emission Control System for models CH26/CH735 and CH745 are EM, O2S, ECM, MFI.
* Horsepower ratings exceed Society of Automotive Engineers Small Engine Test Code J1940. Actual engine horsepower
is lower and affected by, but not limited to, accessories (air cleaner, exhaust, charging, cooling, fuel pump, etc.),
application, engine speed and ambient operating conditions (temperature, humidity, and altitude). Kohler reserves the
right to change product specifications, designs and equipment without notice and without incurring obligation.
18
3 (in 3 ) ........... 624 (38.1) ..................... 624 (38.1) ..................... 674 (41)
3 (in 3 ) ... 725 (44) ............ 725 (44) ................ 725 (44) .............. 725 (44) .................. 747 (45.6)
5. On units with EFI engines, disconnect the
negative (-) battery cable or use a battery minder
trickle charger while the unit is in storage.
6. Store the engine in a clean, dry place.

Parts Ordering

The engine Specification, Model, and Serial Numbers
are required when ordering replacement parts from
your Kohler Engine Service Dealer. These numbers are
found on the identification plate which is affixed to
the engine shrouding. Include letter suffixes if there
are any. See Engine Identification Numbers on page 6.
Always insist on genuine Kohler parts. All genuine Kohler
parts meet strict standards for fit, reliability, and
performance.

Major Repair

Major repair information is available in Kohler Engine
Service Manuals. This type of repair generally
requires the services of a trained mechanic and the use
of special tools and equipment. Kohler Engine Service
Dealers have the facilities, training, and genuine
Kohler replacement parts necessary to perform this
service.
For the nearest Sales & Service location:
• visit our website www.kohlerengines.com
• call 1-800-544-2444 (U.S. & Canada)
• look in the yellow pages under Engines-Gasoline