Adjustment Of Carburettor - Husqvarna 2100 Workshop Manual

When properly adjusted the lever of the needle
valve shall be on a level with the carburettor
housing surrounding it. Adjust if necessary (see
Fig. 4:14)
Fig 4:14
If the lever is located too high, the carburettor will
be very sensitive as regards the adjustment of the
adjusting needles.
A too low lever induces bad acceleration qualities.
Check that the lever can move freely.
Make a pressure test of the carburettor. Proceed as
mentioned above.
Then mount gasket, metering diaphragm and cover .
NOTE!
Care should be taken to ensure that the centre pin of the
diaphragm enters the fork in the level!
Install the adjusting needles and screw them out
to the following basic position:
H = 1.0 turn open
L = 1.2 turn open
C. Speed governor
Locate the sealing washer in the carburettor hous-
ing and fasten the speed governor. Push the choke
shaft into its position and fit the choke flap and
its locking screw.
4:4

Adjustment of carburettor

A. Basic setting
Before adjusting the carburettor, proceed as
follows:
Clean the air filter or, if necessary, replace it
Check the spark plug and its electrodes
check that the fuel filter is not clogged .
Fig 4:15
Examine the fuel filter as follows:
Loosen the fuel hose from the carburettor and lay
the chain saw on the clutch side. Open the tank
cap If there is enough fuel in the tank, some of it
ought to run out of the hose (see fig. 4:15)
Fig 4:16
After the abovementioned checks, make a basic
adjustment of the carburettor needles, i.e. H = 1.0
turn open and L = 1.2 turn open.
Start the chain saw and warm it up by applying
full throttle and letting it cut into a log.
A constant speed, without fourstroking, for 10-20
sec. when cutting into a log indicates not only a
good high speed function of the carburettor but
also a good condition overall.
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