Pressure Testing The Carburettor - Husqvarna 435 Workshop Manual

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 37).
4
Pump the pressure up to 50 kPa.
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.
Fault with
Needle valve
Pump diaphragm
Control diaphragm
Fig 38
Repair instructions
39
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