Kohler Command Pro CH980 User Manual download pdf (Page 14)

Figure 26. Keihin Two-Barrel Carburetor.

NOTE: Carburetor adjustments should be made only

after the engine has warmed up.

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.

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.

Figure 25. Low Permeation Fuel Line.

Carburetor Troubleshooting and

Adjustments

These engines use a Keihin BK two-barrel carburetor

with fixed main jets, and fixed or limiter-equipped

low idle fuel adjusting needles. See Figure 26. In

compliance with government emission standards, the

carburetor is calibrated to deliver the correct fuel-to-

air mixture to the engine under all operating

conditions. Adjustments are made as follows.

Battery Charging

WARNING: Explosive Gas!

Batteries produce explosive hydrogen gas while being charged.

To prevent a fire or explosion, charge batteries only in well

ventilated areas. Keep sparks, open flames, and other sources of

ignition away from the battery at all times. Keep batteries out of

the reach of children. Remove all jewelry when servicing

batteries.

Before disconnecting the negative (-) ground cable, make sure

all switches are OFF. If ON, a spark will occur at the ground

cable terminal which could cause an explosion if hydrogen gas

or gasoline vapors are present.

NOTE: Do not apply 12 volt DC to kill terminal of

ignition module.

Fuel System

Fuel Filter

Most engines are equipped with an in-line fuel filter.

Periodically inspect the filter and replace with a

genuine Kohler filter seasonally or every 150

operating hours.

Fuel Line

These engines use Low Permeation SAE 30 R7 rated

fuel line; certified to meet emission requirements.

Standard fuel line may not be used. Order

replacement hose by part number through a Kohler

Engine Service Dealer.

Drain Screw

Idle Speed (RPM)

Adjustment Screw

Idle Fuel

Adjustments

Vacuum Port

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Kohler Command Pro CH980 User Manual Page 14

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