Husqvarna 445 Workshop Manual page 39

Pressure testing the carburettor
Pressure testing should be carried out with the car-
burettor fully assembled. Testing should always be
carried out after the carburettor has been repaired,
but it can also be carried out as trouble shooting
before dismantling the carburettor.
See figure and carry out the test as follows
1
Set the high and low jet screws two turns from
the bottom.
2
Connect pressure tester to the carburettor's fuel
intake.
3
Lower the carburettor into a beaker of water. (see
figure 3 )
4
Pump the pressure up to 50 kPa (0.5 bar).
5
No leakage is permitted. If a leakage occurs refer
to the table below.
Leakage at
Diffuser jets
Leakage in impulse tube
Ventilation hole
on metering unit.
Replacing the bimetal
1
Release the locking sleeve (A) using a screwdriver.
(see figure 38)
2
Dismantle the bimetal (B). (see figure 38)
3
Fit the new bimetal. Ensure that it is seated correc-
tly. (see figure 39)
4
Assembling the locking sleeve. (A) (see figure 38)
Fault with
Needle valve
Pump diaphragm
Control diaphragm
Fig 37
Fig 38
Fig 39
Repair instructions
B
A
39
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