15
Specifications
Model: ............................................................................................... CH20-22 .......................................... CH25
Bore: .................................................. mm (in.) ................................ 77 (3.03) .......................................... 83 (3.27)
Stroke: ................................................ mm (in.) ................................ 67 (2.64) .......................................... 67 (2.64)
Displacement: ................................... cm
3
(in.
3
) ................................ 624 (38.1) ........................................ 725 (44.0)
Power (@3600 RPM): ....................... kW (HP) ................................ 14.9 (20*) ........................................ 18.4 (25*)
Max. Torque (@RPM): .................. N·m (ft. lb.) ................................ 44 (32) @2500 ................................ 54 (39.5) @2400
Compression Ratio: .......................................................................... 8.5:1 ................................................ 9.0:1
Weight: ................................................. kg (lb.) ................................ 41 (90) ............................................. 43 (94)
Oil Capacity (w/filter): ..................... L (U.S. qt.) ................................ 2 (2.1) .............................................. 2 (2.1)
Lubrication: ....................................................................................... Full Pressure w/full Flow Filter
Exhaust Emission Control System for models CH20 LP, CH25 LP, and CH25 Dual Fuel (open loop) is EM.
Exhaust Emission Control System for model CH25 Dual Fuel (closed loop) is EM, O2S, ECM.
* 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. A horsepower reduction of
approximately 10 percent may be expected with the operation and use of LPG as fuel.
Storage
When the engine is not in use, use the following
storage procedure. Federal, state, or local laws
governing LPG fuel tank storage may also apply.
Follow the applicable storage laws.
1. Clean the exterior surfaces of the engine.
2. Change the oil and filter while the engine is still
warm from operation. See "Change Oil and Oil
Filter" on page 10.
3. Turn valve on LPG tank off and run engine until
the fuel system is empty. Turn ignition key switch
off. Separate LPG tank from the unit and store
separately in an area designated for safe LPG
tank storage. On dual-fuel units, the gasoline 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 manufacturer's
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 carburetor.
Close fuel shut-off valve when unit is being stored
or transported.
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.
5. Store the engine in a clean, dry place. Store the
fuel tank in a designated safe LPG storage area at
all times when not in use.
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. However, major repair generally
requires the attention of a trained mechanic and the
use of special tools and equipment. Your Kohler Engine
Service Dealer has the facilities, training, and genuine
Kohler replacement parts necessary to perform this
service. For Sales & Service assistance call
1-800-544-2444 (U.S. & Canada) or contact your
Kohler Engine Dealer or Service Distributor, they’re in
the Yellow Pages under Engines-Gasoline.
