Husqvarna 439 Operator's Manual page 27

6. Make sure that you can turn the pulley ½ turn after
the starter rope is fully extended.
To assemble the starter housing on
the product
1. Pull out the starter rope and put the starter in
position against the crankcase.
2. Slowly release the starter rope until the pulley
engages with the pawls.
3. Tighten the screws that hold the starter.
To clean the air filter
Clean the air filter regularly from dirt and dust. This
prevents carburetor malfunctions, starting problems,
loss of engine power, wear to engine parts and more
fuel consumption than usual.
1. Remove the cylinder cover and the air filter.
2. Use a brush or shake the air filter clean. Use
detergent and water to clean it fully.
Note: An air filter that is used for a long time can not
be fully cleaned. Replace the air filter regularly and
always replace a defective air filter.
823 - 002 - 08.11.2018
3. Attach the air filter and make sure that the air filter
seals tightly against the filter holder.
Note: Because of different work conditions, weather or
season, your product can be used with different types of
air filter. Speak to your servicing dealer for more
information.
To do a check of the spark plug
CAUTION: Use the recommended spark
plug. Refer to
An incorrect spark plug can cause damage
to the product.
1. If the product is not easy to start or to operate or if
the product operates incorrectly at idle speed,
examine the spark plug for unwanted materials. To
decrease the risk of unwanted material on the spark
plug electrodes, do these steps:
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.
3. Make sure that the electrode gap is 0,5 mm/0.020 in.
4. Replace the spark plug monthly or more frequently if
necessary.
Technical data on page 34 .
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