Kohler Command 6 HP Manuale d'uso - Pagina 12
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Carburetor Troubleshooting
and Adjustments
NOTE: Carburetor adjustments should be made only
after the engine has warmed up.
This engine is equipped with a fixed main jet carburetor.
See Figure 11.
The carburetor is designed to deliver the correct
fuel-to-air mixture to the engine under all operating
conditions. The main fuel jet is calibrated at the factory
and is not adjustable.* The low idle fuel adjusting needle
is also set at the factory and normally does not need
adjustment.
*NOTE: Engines operating at altitudes above
approximately 1829 m (6000 ft.) may require
a special "high altitude" main jet.
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.
Turning the low idle adjusting needle in (clockwise)
decreases the supply of fuel to the carburetor. This
gives a leaner fuel-to-air mixture. Turning the adjusting
needle out (counterclockwise) increases the supply of
fuel to the carburetor. This gives a richer fuel-to-air
mixture. Setting the needle midway between the lean
and rich position will usually give the best results. See
Figures 11 and 12.
Choke Lever
Low Idle Fuel
Adjusting Needle
Figure 11. Fixed Main Jet Carburetor.
12
Low Idle Speed
Adjusting Screw
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 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
NOTE: Certified engines may have a fixed idle or
limiter cap on the idle fuel adjusting needle. Do
not attempt steps 1 and 2 below. Proceed
directly to step 3. Step 5 can only be
performed within the limits allowed by the cap.
1. With the engine stopped, turn the low idle fuel
adjusting needle in (clockwise) until it bottoms
lightly.
NOTE: The tip of the low idle fuel adjusting
needle is tapered to critical dimensions.
Damage to the needle and the seat in
carburetor body will result if the needle is
forced.