Husqvarna 340 Workshop Manual page 33

Repair instructions
Cleaning and inspection
Clean all the carburettor components in petrol. Use
an airline to dry off the petrol from all components.
Blow through all the channels in the carburettor
body and check that they are not blocked.
Check that:
• The gasket, pump diaphragm and metering
diaphragm are undamaged.
• There is no play in the throttle and choke valves.
• The needle valve and its lever arm are not worn.
• The fuel filter is undamaged.
• The tips of the high and low speed jet screws
are not damaged.
• The air intake duct is not cracked.
Carburettor – reassembly
NOTE!
Cleanliness is very important when
reassembling the carburettor. Tiny parti-
cles of dirt can cause operating problems.
The item numbers in the diagram refer to the steps
below (1–8).
32
– English
1
If the throttle and choke butterflies and their
spindles were removed, these must be refitted.
Lubricate the spindle bearings with light oil.
2
Insert the plug in the hole with the convex side
upwards and expand it by pressing downwards
with a drift.
3
Refit the high and low speed jet screws and
springs, plus the idling screw. Fit the plastic caps
over the high and low speed screws.
4
Fit the fuel filter, using the handle of a small screw-
driver.
5
Fit the pump diaphragm, gasket and cover to the
pump unit.
6
Fit the needle valve with lever arm, spindle and
spring and tighten the screw.
Use a rule to check that the lever arm is level with
the cover face. If necessary, the lever arm can be
bent slightly.
7
Fit the metering diaphragm with its gasket and refit
the cover to the metering unit.
8
Carry out pressure testing.