Husqvarna 266 - Manual (Page 5)

Cleaning the air filter
A clean air filter Is necessary for optimal carburettor function and
optimal engine power.
Changing starter cord and return
spring
%
In order to get at the air filter, remove the cylinder cover by undoing
the retaining screws and lifting the cover off upwards-backwards.
Remove the heaviest dirt from the air filter. Undo the screw and lift
the filter off carefully to prevent dirt from falling down into the
carburettor. Loosen the four screws that retain the starter. Remove the starter.
Pull out the cord approx. 30 cm and lift it up into the notch in the
periphery of the pulley.
Zero-set the return spring by carefully letting the pulley rotate
backwards.
Undo the screw in the centre of the pulley and remove the pulley.
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Separate the two filter halves by means of a screwdriver or a knife.
Clean the filter halves carefully in warm soapy water.
Avoid cleaning them in chain saw petrol.
Dry the filter with compressed air
Reassemble the filter and make sure that it lies close to the
carburettor.
Use two air filters alternately.
Clean the filter each day!
In case you change the return spring as well, undo the screws that
retain the plastic cassette, which then can be removed.
Change the spring and lubricate it with engine oil.