Kohler CH730-745 User Manual download pdf (Page 14)

Figure 16. Carburetor (CH18-25,CH730,740).

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.

• Make sure fuel is reaching the carburetor. This

includes checking the fuel lines and fuel pump for

restrictions or faulty components, replace as

necessary.

• Make sure the air cleaner element is clean and all

air cleaner element components are fastened

securely.

If, after checking the items listed above, the engine is

hard to start, runs roughly, or stalls at low idle speed, it

may be necessary to adjust or service the carburetor.

Adjust Carburetor

There are no accessible mixture adjustment screws on

the carburetor. The only setting which can be changed

is the low idle speed.

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

minutes to warm up. The engine must be warm

before making final settings (steps 2 and 3).

2. Low Idle Speed Setting: Place the throttle

control into the “idle” or “slow” position. Set the

low idle speed to 1200 RPM* (± 75 RPM) by

turning the low idle speed adjusting screw in or

out. Check the speed using a tachometer.

*NOTE: The actual low idle speed depends on the

application – refer to equipment

manufacturers recommendations. The

standard low idle speed is 1200 RPM.

3. If proper operation is not restored after adjusting

the low idle speed, carburetor servicing by an

authorized Kohler Engine Service Dealer may be

required.

Electronic Fuel Injection (EFI) System

The EFI system is a complete, electronically-controlled

fuel management system, designed to deliver a

precisely controlled fuel flow under all operating

conditions. The electronic control unit (ECU), the

‘‘brain’’ of the system, automatically adjusts fuel

delivery and ignition timing based upon load, speed,

operating temperature, and exhaust emission levels.

The low idle speed is the only manual adjustment

possible.

The ECU continuously monitors operation of the EFI

system. If it detects a problem or fault within the

system, it will illuminate the malfunction indicator light

(MIL), which is mounted in view of the operator. This is

a signal that normal, programmed operation has been

affected, and service by an authorized Kohler Engine

Dealer is required.

NOTE: The EFI system requires a rather complex

wiring harness to carry the electrical signals

between the sensors and the ECU. Do not

spray water at the wiring harness or any of the

electrical components, especially the ECU, as

it could cause malfunction, damage, or failure.

Troubleshooting

If the MIL comes on, or the engine becomes hard to

start, runs roughly, or stalls at low idle speed, initial

checks should be made in the following areas:

• Make sure the fuel tank is filled with clean, fresh

gasoline, and shut-off valve (if so equipped) is

opened completely.

• Make sure fuel tank vent cap is not blocked and it

is operating properly.

• Make sure the air cleaner element and precleaner

are clean and all components are properly

secured. Clean or replace as necessary.

Low Idle

Speed Adj.

Screw

Low Idle

Fuel Adj.

Needle &

Spring

Fixed Main Jet

(under optional

solenoid)

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Kohler CH730-745 User Manual Page 14

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