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15
Figure 18. Family Number Location.
EFI Engines: A special fuel line, capable of
withstanding the high pressure of the EFI fuel system,
is used (must meet SAE R9 specifications). See Figure
17. If fuel line must be replaced, see your Kohler
Engine Service Dealer.
Carburetor Troubleshooting and
Adjustments
Engines in this series use either a single barrel or two
barrel carburetor depending on model, and may also
be equipped with a Governed Idle System. Specific
adjustment procedure(s) are provided based on the
model and carburetor involved. If the engine is
equipped with a Governed Idle System, refer to
Models with Governed Idle System when performing
any carburetor adjustment, as an additional step to
the listed procedure(s) is required.
NOTE: Carburetor adjustments should be made
only after the engine has warmed up.
Fuel Line
Carbureted Engines: In compliance with CARB Tier III
Emission Regulations, carbureted engines with a
Family identification number beginning with “6” or
greater (see Figure 18), must use Low Permeation SAE
30 R7 rated fuel line; certified to meet CARB
requirements. Standard fuel line may not be used.
Order replacement hose by part number through a
Kohler Engine Service Dealer.
Figure 19. Carburetor CV18-23,CV620-CV730,CV740.
Troubleshooting
If engine troubles are experienced that appear to be
fuel system related, check the following areas before
adjusting the carburetor.
• Make sure the fuel tank is filled with clean, fresh
gasoline.
• Make sure the fuel tank cap vent is not blocked
and that it is operating properly.
• If the fuel tank is equipped with a shut-off valve,
make sure it is open.
• If the engine is equipped with an in-line fuel filter,
make sure it is clean and unobstructed. Replace
the filter if necessary.
KOHLER CO. KOHLER, WISCONSIN USA
EMISSION COMPLIANCE PERIOD:
EPA: CARB:
CERTIFIED ON:
REFER TO OWNER'S MANUAL FOR HP RATING,
SAFETY, MAINTENANCE AND ADJUSTMENTS
1-800-544-2444 www.kohlerengines.com
FAMILY 6 KHXS.XXXXPH
TYPE APP
DISPL. (CC)
MODEL NO.
SPEC. NO.
SERIAL NO.
BUILD DATE
OEM PROD. NO.
IMPORTANT ENGINE INFORMATION
THIS ENGINE MEETS U.S. EPA AND CA 2005 AND
LATER AND EC STAGE II (SN:4) EMISSION REGS
FOR SI SMALL OFF–ROAD ENGINES
N11236
The carburetor is designed to deliver the correct
fuel-to-air mixture to the engine under all operating
conditions. The high speed mixture is set at the factory
and cannot be adjusted. The low idle fuel adjusting
needle (if equipped) is also set at the factory and
normally does not need adjustment.
NOTE: To ensure correct engine operation at
altitudes above 1525 meters (5000 ft.), it may
be necessary to have an authorized Kohler
dealer install a special high-altitude jet kit in
the carburetor. If a high-altitude kit has been
installed, the engine must be reconverted to
the original jet size, before it is operated at
lower altitudes, or overheating and engine
damage can result.
Idle Speed
Adj. Screw
& Spring
Idle Fuel
Adj. Needle
& Spring
Fuel Shut-Off
Solenoid
(some engines
equipped with)