Husqvarna 120 Workshop Manual

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42 - EnglishRepair InstructionsLeak in Fault withDiffuser jets Needle valveLeak in the impulse pipe Pump membraneVentilation hole on the Control membranemetering unit.Pressure testing the carburettorPressure testing should be carried out with the car-burettor fully assembled. Testing should always becarried out after the carburettor has been repaired,but a test can also be made for troubleshootingbefore dismantling.Option 1Carry out the check as follows:1Connect pressure tester to the carburettor fuel inlet.2Submerge the carburettor into a container withwater. See figure 43.3Pump up the pressure to 20 kPa.4No leakage is permitted. If leakage occurs refer tothe table below.Option 2Carry out the check as follows:1Plug the connections to the fuel inlet.2Create a vacuum to the purge nipple on the car-burettor. No leakage is permitted. In the case ofleakage, leakage spray can be used even if it is dif-ficult. Try and identify where the spray is absorbed.It can be used to show leakages in main jets, idlingneedles, measuring cover gaskets and measuringdiaphragms.Fig 43Assemble the carburettor1Assemble the carburttor according to the instruc-tions given in “Dismantling the carburettor” inreversed order.