Jonsered CS 2166 Workshop Manual page 31

Pressure testing
Pressure testing should be carried out with the carburettor
fully assembled. Testing should always be carried out
after the carburettor has been repaired, but can also be
performed for trouble shooting before dismantling.
Refer to fig. 17 and carry out the test as follows:
1. Screw in the high and low speed jet screws and back
them off one turn.
2. Connect pressure tester 531 03 06-23 to the
carburettor fuel inlet.
3. Lower the carburettor into a beaker of water.
4. Pump up the pressure to 50 kPa (0.5 bar) and
clamp the pump tube.
5. There should be no leakage. If leakage occurs, refer
to the table below.
Leakage at
Diffuser jets
Leakage in impulse tube
Ventilation hole above
diaphragm
metering unit
Refitting to the chainsaw
See fig. 18.
1. Loosen the air filter holder and position the
carburettor in place in the saw.
2. Bolt together the filter holder, carburettor and air
intake tube. Tighten the bolts to 1.5 Nm.
3. Refit the fuel pipe (B) to the fuel nipple and tube (C)
to the impulse nipple.
4. Refit the throttle cable and choke control.
5. Refit the carburettor control (A).
6. Refit the cylinder cover and air filter.
CARBURETTOR
Fault with
Needle valve
Pump diaphragm
Control
Fig. 17
A
D
Fig. 18
C
B
D
English – 31