Carburetor Check; Pumping Section; Metering Section; Assembly - Husqvarna 181 Workshop Manual

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Fuel system
Carburetor check
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P s
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Clean the fuel screen and -lines with compressed air. Check the gasket and the
pump diaphragm for damage or wear.
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Check that the adjusting needles are straight and that their tapered ends are
Check the gasket and the metering diaphragm for damage or wear.
Check with particular care the wear on the centre pin of the diaphragm.
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Check that the needle valve is not worn, neither on its seat, nor in the groove
for the lever.
Check that the needle valve lever is not worn, neither at the connection to the
needle valve nor the metering diaphragm.
Check that the filter screen near the main jet is not dirty or damaged.
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Clean all fuel lines and jets with compressed air.
Replace damaged or worn parts with new ones.
Assembly
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Locate the fuel screen carefully in its seating.
Locate the pump diaphragm next to the carburetor housing and then add
gasket and cover.
Tighten the four screws of the cover diagonally and evenly.
M s
Fit new welch plugs. Install them with a suitable drift:
for the big plug: drift 08 mm
for the small plug: drift 04 mm
NOTE!
Do not press in the plugs so that they bulge inwards!
Mount needle valve, lever, spring and shaft.
Locate the spring properly!
TIP
The carburetor spare part kit has got No. 5015467-01.
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