Husqvarna 120 Workshop Manual page 44

Repair Instructions
Basic adjustment for chain saws with ignition system and carburettors without limiters
To ensure that the engine components receive adequate lubrication (running in) the carburettor should be
set to a somewhat richer fuel mixture for the chain saw's first 3-4 running hours. This is done by adjusting
the maximum speed to 600-700 rpm less than the recommended maximum speed. Use tool 530 03 55-60
to adjust the carburettor (L- and H-needle).
Adjustment of the L-needle and T-needle.
1. Find the highest idling speed by slowly turning
the L-screw clockwise and counterclockwise.
2. Turn the T-screw until the idling speed is 3 000
rpm.
1
4
Fig 47
Adjustment of the H-needle.
1. Adjust the H-screw until the maximum engine
speed at full throttle is 12250 rpm.
44
- English
L
0.5
3. Repeat the procedure in 1 and 2 once again.
4. Turn the L-screw counterclockwise 0,5 of a turn.
5. Adjust the T-screw until the idling speed is 2 700
rpm.
2
5
Fig 48
3 000 rpm
2 700 rpm
12250 rpm