Husqvarna K1270 II Workshop Manual page 38

6.6.3.6 To examine and clean the needle valve
1. Remove the needle valve.
2. Examine the spring and make sure that the lever
runs easily on the axle.
3. Examine the needle valve end with a magnifying
glass. If there are signs of particles or if the needle
valve end is damaged, replace the needle valve.
4. Clean the needle valve seating.
5. Install the needle valve in the opposite sequence.
6.6.4 Pump unit function
The pump diaphragm (A) receives power by changes of
pressure in the crankcase. The pressure changes are
caused by the piston movement and transmitted to the
38 - Repair and servicing
top of the pump diaphragm. The fuel below the
diaphragm is pushed to the valves (B). Pressure from
the measurement chamber diaphragm to the needle
valve in the measurement chamber controls how much
the valve opens. It also controls the quantity of fuel
transmitted to the fuel side of the measurement
chamber.
B
6.6.5 To examine the pump diaphragm
1. Connect the pressure tester to the fuel line.
2. Increase the pressure to to a maximum of 36 psi/ 2.5
bar.
If air comes out of the impulse channel, the pump
diaphragm is broken.
6.6.6 Function of the measurement chamber
The product has SmartCarb
measurement chamber has an air chamber to the cover
A
™
filter compensation. The
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