Husqvarna 543RBX Workshop Manual page 28

10. Connect the pressure tester to the fuel hose. Lower
the carburetor in a vessel with gasoline to find leaks.
Do a test of the pressure at 50 kPa.
11. If there is a leakage, remove the needle valve.
a) Loosen the bolt and remove the lever arm, axle,
needle valve and spring.
28 - Repair instructions
b) Examine the lever arm and the needle valve for
wear and damage.
c) Remove the screw and remove the cover (G).
G
H
I
J
d) Remove the gasket (H) and the diaphragm (I).
Examine the diaphragm for damage.
e) Remove the fuel screen (J).
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