Kohler SH390 Instrukcja obsługi - Strona 17

Przeglądaj online lub pobierz pdf Instrukcja obsługi dla Silnik Kohler SH390. Kohler SH390 24 stron.

Carburetor Troubleshooting and

Adjustments

NOTE: Carburetor adjustments should be made only

after the engine is at operating temperature.

The carburetor is designed to deliver the correct

fuel-to-air mixture to the engine under all operating

conditions. The idle mixture is set at the factory and

normally does not require 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.

If the engine is hard to start, runs roughly, or stalls at

low idle speed, it may be necessary to adjust or service

the carburetor. Engine must not exceed 3850 ± 100

RPM if the high speed screw is adjusted. See Figure 25.

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.

• Make sure the fuel shut-off valve is fully open.

• Make sure oil is at correct level.

• Make sure fuel shut-off valve strainer, and in-line

fuel filter (if used) are clean and unobstructed.

Clean or replace as necessary.

• Make sure fuel is reaching the carburetor. This

includes checking the fuel lines and components

for restrictions or problems. Replace as necessary.

• Make sure On-Off switch is functioning properly.

• Make sure the air cleaner element is clean and all

air cleaner 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.

Screw

Figure 25. High Speed Screw.