Husqvarna K1270 Workshop Manual page 47

Carburettor
PUMP UNIT – FUNCTION
The pump diaphragm (A) is driven by the pressure
B
A
variations in the crankcase, which are led to the top
of the pump diaphragm.
The fuel on the underside of the diaphragm is
pumped to the valves (B). The counter pressure of
the measurement chamber diaphragm against the
needle valve in the measurement chamber controls
the valves' degree of opening and the quantity of
fuel pumped into the measurement chamber's fuel
side.
PUMP UNIT FUNCTION
PUMP UNIT– INSPECTION
Pump diaphragm leakage is checked as previously
described.
The function of the valve flaps cannot be pres-
sure tested and must be visually inspected. The
valve flaps must be absolutely flat and close tight
against the carburettor housing in order for the
pump function to work. If the flaps show signs of
buckling, fatigue or cracking, the diaphragm must
be replaced.
FUEL STRAINER
There is a fine-meshed strainer located on the
fuel inlet to the carburettor. Inspect this with a
magnifying glass. Loose dirt particles can be blown
away from the needle valve's seating. If there are
deposits that are hard to remove or the mesh is
damaged the strainer must be replaced.
The strainer is dismantled using a needle or awl. Fit
the new strainer with a .3 in./7 mm punch.
FUEL STRAINER
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