Carburetor - Husqvarna 531RB Workshop Manual

7.5.2 To clean the air filter
CAUTION: Always replace a damaged air filter.
The wear on the engine increases with a
damaged air filter. Clean the air filter at an
interval of 25 hours of operation.
If you use an air filter for a long time, it cannot be fully
cleaned. Replace the air filter with a new one at regular
intervals.
1. Remove the air filter cover and remove the air filter.
2. Clean the air filter with compressed air.
3. Clean the inner surface of the filter cover. Use
compressed air or a brush.
4. If the air filter is not clean, remove the air filter and
clean it with warm water and soap.
5. Make sure that the filter is dry before you assemble
the air filter again.
7.5.3 To apply oil to the air filter
CAUTION: Always use Husqvarna special air-
filter oil. Do not use other types of oil.
WARNING: Put on protective gloves. The air-
filter oil can cause skin irritation.
1. Put the air filter in a plastic bag.
2. Put the oil in the plastic bag.
3. Rub the plastic bag to supply the oil equally across
the air filter.
935 - 001 -
4. Push the unwanted oil out of the air filter while in the
plastic bag.

7.6 Carburetor

7.6.1 Carburetor description
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2
3
4
5
6
7
8
9
1. Fuel inlet
2. Fuel valve
3. Fuel inlet screen
4. Valve seat
5. Needle valve
6. Carburetor float
7. Float chamber
8. Main nozzle
9. Fuel drain screw
10. Jet needle
11. Lever arm
12. Needle jet
13. Idle adjustment screw
14. Throttle valve
7.6.2 The function of a float-type carburetor
Carburetor description on page 21 for the
Refer to
illustration for this text.
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13
12
11
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Repair instructions- 21