English - 35
Repair Instructions
7.24 Adjustment of AutoTune at change
of carburettor
The chainsaw will be completely adjusted
automatically after a few fuellings at normal running.
- The high speed part is set during loaded running,
such as cutting and felling.
-The idle part is set when the chain saw idles for
some time.
Leak in Fault with
Diffuser jets Needle valve
Leak in the impulse pipe Pump membrane
Ventilation hole on the Control membrane
metering unit.
7.25 Pressure testing the carburettor
Pressure testing should be carried out with the
carburettor fully assembled. Testing should always
be carried out after the carburettor has been
repaired, but a test can also be made for
troubleshooting before dismantling.
Option 1
1. See the figure and carry out the check as
follows:
2. Connect pressure tester to the carburettor fuel
inlet.
3. Submerge the carburettor into a container with
water. See figure 43.
4. Pump up the pressure to 20 kPa.
5. No leakage is permitted. If a leakage occurs
refer to the table below.
Option 2
1. Plug the connections to the fuel inlet.
2. Create a vacuum to the purge nipple on the
carburettor. No leakage is permitted. In the
case of leakage, leakage spray can be used
even if it is difficult. Try and identify where the
spray is absorbed. It can be used to show
leakages in main jets, idling needles,
measuring cover gaskets and measuring
diaphragms, and autotune gaskets.
Fig 43
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