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Specifications
Model: .............................................................. LH630/LH640 ............ LH685/LH690 ............. LH755 .......................... LH775
Bore: ......................................... in. (mm) ....... 3.03 (77) ..................... 3.15 (80) ...................... 3.3 (83) ........................ 3.3 (83)
Stroke: ...................................... in. (mm) ....... 2.64 (67) ..................... 2.64 (67) ...................... 2.7 (69) ........................ 2.7 (69)
Displacement: ........................ in
3
(cm
3
) ....... 38.1 (624) ................... 41.1 (674) .................... 45.6 (748) .................... 45.6 (748)
Power (Max. @3600 RPM): .... HP (kW) ....... 22* (16.4)/24* (17.9)... 25* (18.6)/26* (19.4).... 28* (20.9) ..................... 31* (23.1)*
Compression Ratio: ...................................... 8.5:1 ............................ 8.5:1 ............................. 8.7:1 ............................. 8.7:1
Dry Weight:................................ lb. (kg) ....... 114 (51.7) ................... 114 (51.7) .................... 114 (51.7) .................... 114 (51.7)
Coolant/Anti-Freeze: ...... U.S. qts. (L) ....... ----------- Equal Parts of Water and Ethylene Glycol 2.18 (2.0) -----------
Lubrication: ..................................................... ------------------------ Full Pressure w/full Flow Filter ----------------------------
Oil Capacity (w/filter) - approximate,
determined by oil filter used: ...................... ------------------------------ 1.6-1.8 L (1.7-1.9 U.S. qt.) -----------------------------------
Exhaust Emission Control System for models LH630, LH640, LH685, LH690, and LH755 is EM.
Exhaust Emission Control System for models LH775 is 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.
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 radiator and
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 9.
3. The coolant (anti-freeze) mixture should be in
good condition and tested to guard against
freezing in cold temperatures. The recommended
50/50 mixture will normally provide protection
down to temperatures of -37°C (-34°F). If storage
temperatures will fall below this, the cooling
system should be drained completely. A note
should then be attached to the equipment and/or
engine as a reminder to refill the cooling system
before starting.
4. 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
carburetor. Close fuel shut-off valve when unit is
being stored or transported.
To empty the system, run the engine until the
tank and system are empty.
5. Remove the spark plugs. Add one tablespoon of
engine oil into each spark plug hole. Install plugs,
but do not connect the plug leads. Crank the
engine two or three revolutions.
6. On units with EFI engines, disconnect the
negative (-) battery cable or use a "battery
minder" trickle charger while the unit is in
storage.
7. 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 5.
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