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CH18-25 Carburetor Troubleshooting and

Adjustments

NOTE: Carburetor adjustments should be made only

after the engine has warmed up.

The carburetor is designed to deliver the correct

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

conditions. The high idle is set at the factory and cannot

be adjusted. The low idle fuel adjusting needle is also

set at the factory and normally does not need

adjustment.

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.

Low Idle

Speed Adj.

Screw

Figure 13. Carburetor (CH18-25).

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

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

1. With the engine stopped, turn the low idle fuel

Low Idle

Fuel Adj.

Needle &

Spring

2. Preliminary Low Idle Fuel Needle Setting: Turn

Fixed Main Jet

(under optional

solenoid)

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

4. Low Idle Fuel Needle Setting: Place the throttle

5. Low Idle Speed Setting: Place the throttle

air cleaner element components are fastened

securely.

limiter cap on the idle fuel adjusting needle. Do

not attempt steps 1 and 2 below. Proceed

directly to step 3. Step 4 can only be

performed within the limits allowed by the cap.

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.

the adjusting needle out (counterclockwise) from

lightly bottomed position 1-5/8 turns.

minutes to warm up. The engine must be warm

before making final settings (steps 4 and 5).

into the "idle" or "slow" position. Turn the low

idle fuel adjusting needle in (slowly) from the

preliminary setting until engine speed decreases

and then back out approximately 3/4 to 1 turn to

obtain the best low-speed performance.

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

manufacturer's recommendations. The

recommended low idle speed for basic

engines is 1200 RPM. To ensure best

results when setting the low idle fuel

needle, the low idle speed must not

exceed 1200 RPM (± 75 RPM).