Husqvarna K1270 Workshop Manual page 46

Carburettor
MEASUREMENT CHAMBER DIAPHRAGM –
INSPECTION
Make a visual inspection of the diaphragm with
regard to cracks and leakage.
Fuel on the top, towards the cover, indicate
leakage. Change the diaphragm.
NEEDLE VALVE
A faulty needle valve is the most common cause
of malfunction caused by the carburettor. Perform
a pressure test as previously described. If the
test indicates a leaking needle valve, proceed as
follows:
Dismantle the screw holding the axle and remove
the components.
Check that the spring is not deformed and that the
lever runs easily on the axle.
When reassembling: Note that the lever has two
forks where the needle valve and measurement
chamber diaphragm fit.
INSPECT THE TIP OF THE NEEDLE WITH A
MAGNIFYING GLASS
If there are signs of deposits that cannot be
removed easily or the tip of the needle is deformed
(waistline) after the seating that it seals against,
the needle valve should be replaced. Always
replace in uncertain cases.
See the needle valve as a wear part that needs to
be replaced during the life of the machine.
(The illustration shows a new needle tip.)
CLEAN THE SEATING
Check whether there is dirt on the needle valve's
seating. If compressed air is used for cleaning, the
pump diaphragm must be dismantled to prevent
damage from over pressure.
46
- English
DISMANTLE NEEDLE VALVE
INSPECT THE TIP OF THE NEEDLE
CLEAN THE SEATING