Husqvarna T425 Workshop Manual page 41

Pressure testing the carburettor
Pressure testing should be carried out with the car-
burettor fully assembled. The test shall always be
done after the carburettor has been repaired, but
can also be carried out as trouble shooting before
the carburettor is taken apart.
See fi gure 46 and check as follows:
1
Adjust the high- and low-speed screw to two revo-
lutions from the bottom.
2
Connect pressure tester to the carburettor fuel
inlet.
3
Submerge the carburettor into a container with
water (see fi gure 46).
4
Pump up the pressure to 50 kPa.
5
No leaks are permitted. In case of leaks, see the
table below.
Leak in
Diffuser jets
Leak in the impulse pipe
Ventilation hole on the
metering unit.
Fault with
Needle valve
Pump membrane
Control membrane
Fig 46
Repair instructions
41
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