Husqvarna 122C Workshop Manual page 24

3
22
Fuel system
Fit the carburettor needles and adjust
them to the basic setting:
H = 1.0 turn
L = 1.5 turns
530 03 55-60
Pressure test the metering unit.
531 03 06-23
Assemble the various parts of the pump
unit.
Fit the carburettor needles.
Screw them in so that they just reach the
bottom of the needle seat.
Then screw them out according to the
basic setting:
H = 1.0 turn
L = 1.5 turns
NOTE!
The H-needle is a little shorter than
the L-needle.
Connect the pressure tester 531 03 06-23
to the fuel hose nipple (by the carburettor
needles).
Lower the carburettor in a vessel with
petrol in order to discover any leaks more
easily.
Test the pressure at 50 kPa.
No leakage is permitted.
Assemble the various parts of the pump
unit.
Check that there are no holes in the pump
diaphragm (C) by holding it up to a light
for instance.
Do not forget the fuel screen (D).
Make sure that it is not damaged or dirty.
NOTE!
During assembly the pump
diaphragm must lie closest to the
carburettor housing.