Husqvarna 120 Mark II Operator's Manual page 20

• 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 mesh.
• 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.
• Do a check of the saw chain lubrication each time
To do a check of the saw chain
you refuel. See
lubrication on page 23 .
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.
20
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 sharpen the saw chain
The cutter
The cutting part of the saw chain is called the cutter and
consists of a cutting tooth (A) and the depth gauge (B).
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