Husqvarna 122C Workshop Manual page 22

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Fuel system
Check the needle valve and the lever arm
for damage or wear.
Replace damaged components with new
ones.
Remove the jet needles and inspect them
for damage.
530 03 55-60
The pump unit
Remove the pump diaphragm.
Check the diaphragm for damage.
Remove the fuel screen and clean it or
attach a new one.
Check the needle valve for damage on the
tip and in the lever arm groove.
Check the lever arm for damage to the
groove for the needle valve and wear on
the mounting points towards the control
diaphragm.
Replace damaged components with new
ones.
Unscrew both jet needles H and L using
the special tool 530 03 55-60.
NOTE!
Note how the jets are positioned.
(For example, the H-needle is a little
shorter than the L-needle).
Inspect the needles for damage such as
a broken tip. Replace in that case with a
new needle.
The pump unit
Remove the 2 screws holding the cover
over the pump diaphragm.
Lift off the cover (A), the gasket (B) and
the pump diaphragm (C).
Check the diaphragm for damage to the
valve tongues. If the valve tongues are
bent, the pump will not function in a satis-
factory manner.
Hold it up to a light as well to discover any
holes in the material.
Carefully remove the fuel screen (D),
using a needle for example. Clean or
replace the fuel screen.