Husqvarna R 422Ts AWD Manuel D’Utilisation

English

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If the engine seems to lack power or does not run smoothly 
this may be because the air filter is clogged. It is therefore 
important to replace the air filter at regular intervals (see 
Maintenance/Maintenance Schedule for the correct service 
interval).

Replace the air filter as follows:

1

Open the engine cover.

2

Loosen the knobs holding the filter cover in place and 
remove it.

3

Pull up the filter at one edge and lift it out.

4

Remove the foam rubber prefilter which is placed around 
the filter cartridge and clean using a mild detergent. 
Squeeze it dry in a clean cloth.

Clean the filter by knocking it with care against a hard 
surface. Do not use compressed air to clean the filter. 
Replace the air filter if it is still dirty. If the paper filter is still 
dirty it should be replaced with a new one.

Refit the pre-filter on the paper filter.

5

Put the filter cartridge back in place. Make sure the filter 
cartridge is correctly fitted in the filter housing.

6

Refit the air filter cover.

The engine is equipped with an electronic ignition system. 
Only the spark plug requires maintenance.

For recommended spark plug, see Technical data.

1

Remove the ignition cable shoe and clean around the 
spark plug.

2

Remove the spark plug with a 3/4” (19 mm) spark plug 
socket wrench.

3

Check the spark plug. Replace the spark plug if the 
electrodes are burned or if the insulation is cracked or 
damaged. Clean the spark plug with a steel brush if it is to 
be reused.

4

Measure the electrode gap with a gapping tool. The gap 
should be 0.75 mm/0.030”. Adjust as necessary by 
bending the side electrode.

5

Reinsert the spark plug, turning by hand to avoid 
damaging the threads.

6

Tighten the spark plug, once it touches the seating, with 
the spark plug spanner. Tighten the spark plug so that the 
washer is compressed. A used spark plug should be 
turned 1/8 of a turn from the seated position. A new spark 
plug should be turned a 1/4 turn from the seated position.

7

Replace the ignition cable shoe.

Keep the engine and muffler free from grass cuttings and dirt.  
Grass cuttings steeped in petrol or oil on the engine can 
increase the fire risk and impair cooling.

Allow the engine to cool before cleaning. If the dirt is mixed 
with oil, remove it using a degreasing agent otherwise just 
water and a brush.

Grass cuttings around the muffler dry quickly and constitute a 
fire risk. Brush or wash them off when the muffler is cold.

Never run the engine without the air filter fitted.

The filters must not be oiled. They must be fitted dry.

Fitting the wrong spark plug type can damage the engine.

Inadequately tightened spark plugs can cause overheating 
and damage the engine. Tightening the spark plug too 
much can damage the threads in the cylinder head.