To Adjust The Idle Speed; To Clean The Spark Arrester Screen; Yearly Maintenance; Intermittent Maintenance - Husqvarna 120 Mark II Operator's Manual

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D
• Examine the clutch center, clutch drum and
clutch spring for wear.
• Clean the spark plug. Make sure that the
electrode gap is correct.
• Clean the external surfaces of the carburetor and
its adjacent areas.
• Examine the fuel filter and the fuel hose. Replace
if necessary.
• Empty the fuel tank.
• Empty the oil tank.
• Examine all cables and connections.

Yearly maintenance

• Examine the spark plug.
• Clean the external surfaces of the carburetor and
its adjacent areas.
• Clean the cooling system.
• Examine the spark arrester screen.
• Examine the fuel filter.
• Examine the fuel hose for damage.
• Examine all cables and connections.

Intermittent maintenance

• Have an approved service center repair or
replace the muffler after 50 hours of operation.
• Do maintenance on the spark plug when:
• the power level in the engine is low.
• it is hard to start the engine.
• the engine does not work correctly at idle
speed.
18
• Do a check of the saw chain lubrication each
time you refuel. See
chain lubrication on page 21 .

To adjust the idle speed

Make sure that the air filter is clean and the air filter
cover is attached before you adjust the idle speed.
1. Turn the idle adjustment screw, which is
identified with a "T" mark, clockwise until the saw
chain starts to turn.
2. Turn the idle adjustment screw, which is
identified with a "T" mark, counterclockwise until
the saw chain stops.
3. The idle speed must be below the speed when
the saw chain starts to turn. The idle speed is
correct when the engine operates smoothly in all
positions.

To clean the spark arrester screen

1. Use a wire brush to clean the spark arrester
screen.
To do maintenance on the spark
plug
CAUTION: Use the recommended spark
plug. Make sure that the replacement is
the same as the manufacturer supplied
part. An incorrect spark plug can cause
damage to the product.
1. If the product is hard to start or operate, examine
the spark plug for unwanted materials. To
decrease the risk of unwanted material on the
spark plug electrodes:
a) make sure that the idle speed is correctly
adjusted.
b) make sure that the fuel mixture is correct.
c) make sure that the air filter is clean.
2. Clean the spark plug if it is dirty. Make sure that
the electrode gap is correct.
3. Replace the spark plug when it is necessary.
To clean the air filter
1. Remove the air filter cover and remove the air
filter.
2. Clean the air filter with warm soap water. Make
sure that the air filter is dry before you install it.
3. Replace the air filter if it is too dirty to fully clean
it. Always replace a damaged air filter.
To do a check of the saw
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