Kohler COMMAND CH18-745 User Manual download pdf (Page 51)

5A.4

Section 5A

LPG Fuel Systems

High Altitude Operation

The standard carburetor calibrations will provide

proper operation up to altitudes of 1500 m (5000 ft.).

No internal changes are necessary or available for

either carburetor.

NOTE: Carburetor adjustments should be made only

after the engine has warmed up.

Idle Speed Adjustment

1. Start the engine and run at half throttle for 5 to 10

minutes. Check that the throttle and choke (Nikki

carburetor) plates can open fully.

2. Place the throttle control into the “idle” or “slow”

position. Turn the low idle speed adjusting screw

(See Figure 5A-2 or 5A-3) in or out, to obtain a

low idle speed of 1200 RPM (± 75 RPM), or set to

application specifications. Check the speed using

a tachometer.

NOTE: The actual low idle speed (RPM) depends on

the application. Refer to the equipment

manufacturer’s recommendations. The low

idle speed for basic engines is 1200 RPM.

LPG Fuel System Component Service

LPG Carburetor - Cleaning

The carburetor may be cleaned if necessary. Removal

from the engine and limited disassembly will aid in

cleaning.

NOTE: Impco Carburetor: Do not loosen or alter the

mounted position of the clamping brackets

and/or stop collar on the throttle shaft. Each is

preset, in correlation to a specific position of

the throttle plate (shaft), or acts as a stop.

None of these attached components,

including the throttle plate or shaft, requires

disassembly or removal for any carburetor

servicing. All the components on the throttle

shaft should be left intact. If the settings of

any one of these is inadvertently loosened or

altered, each must be checked/reset, or

performance and operation will be affected.

Refer to the procedure included in the

reassembly/installation sequence to check or

reset.

Impco Carburetor

1. Turn off fuel supply at tank.

2. Remove the air cleaner, breather hose, fuel line,

vacuum hose, choke, and throttle linkages.

Remove the mounting hardware, carburetor, and

gaskets from the engine. Discard the gaskets.

3. The carburetor venturi may be removed for

inspection and appropriate cleaning.

a. Remove the four screws securing the air

cleaner adapter and gasket to the carburetor.

See Figure 5A-4.

Figure 5A-4.

b. Important: Mark a small line on the outer

edge of the venturi for proper orientation and

reinstallation later.

c. Loosen the venturi retaining screw on the side

of the carburetor body and lift out the

venturi. See Figure 5A-5.

Figure 5A-5.

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Kohler COMMAND CH18-745 User Manual Page 51

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