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Leakage at Fault with
Diffuser jets Needle valve
Leakage in impulse tube Pump diaphragm
Ventilation hole
on metering unit. Control diaphragm
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 gure 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
gure 37).
4
Pump the pressure up to 50 kPa.
5
No leakage is permitted. If a leakage occurs refer
to the table below.
Repair instructions
Fig 38