Husqvarna 250 PS Workshop Manual page 16

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Remove the membrane cover and carefully lift off the
control membrane.
Connect the pressure tester to the fuel hose nipple.
Lower the carburettor into a container filled with petrol.
Pressure test to 0.4 bar (40 kPa). No leakage is
permitted.
If there is a leak, remove the needle valve. Undo the
screw and lift off the lever, spindle, needle valve and
spring.
Examine the needle valve for wear. Replace the needle if
worn or damaged.
Examine the lever for wear. Replace the lever if worn or
damaged.