Husqvarna 570 Workshop Manual page 39

5. Let the engine run at "B" rpm ~ 1 minute, until warm.
6. Close the H-needle further "C" turn on a scale to get
correct setting.
Model
570 C = 1/4
575XP C = 3/4
Tachometer
Due to the integrated speed limitation in the ignition system
most tachometers will not indicate a speed above the value
that the speed limitation is set to.
Speed limitation regulates at:
570 13,600 rpm
575XP 13,600 rpm
7. Check that the H-cap is still adjusted to its richest
setting (turned counterclockwise to stop). Note! The
H-needle must not rotate!
8. Gently knock the H-cap into position. Use a
5 mm/0,2 inch mandrel (for example the locking pin
for the bevel gear ref. no. 502 02 61-03). This is a
basic carburettor adjustment. Further fine
adjustments, within the limits the caps allow, may be
necessary to achieve optimum performance. See
the Operator's Manual.
Replacement of the L-needle
1. Take off the cap from the L-needle using a pair of
cutting pliers and unscrew the needle.
2. Screw the new L-needle to the bottom and then turn it
counterclockwise "D" turns.
Model
570 D = 1,5
575XP D = 1,5
3. Press a new L-cap on the L-needle to the first stop,
which means that the cap is not fixed to the needle,
it should rotate independently.
4. Adjust the L-cap to the richest position (turned
counterclockwise to stop) without turning the needle.
5. Let the engine run at ~ "E" app. 1 minute until warm
and then let it run on idle.
Model
570 E = 13 000
575XP E = 13 000
6. Adjust the idle speed to "F" rpm.
Model
570 C = 2700
575XP C = 2700
CARBURETTOR
7. Adjust the L-needle until the highest possible idling
speed is achieved and then turn the L-needle 1/2
turn counterclockwise. Use a narrow blade
screwdriver (ref.no. 531 00 48-63) and insert through
the hole in the cap (max. blade width 2 mm/0,08 inch).
Note! If the chain rotates, turn the idling speed screw
(T) counterclockwise until the chain stops.
8. Check that the L-cap is still adjusted to its richest
position (turned counterclockwise to stop).
Note! The L-needle must not rotate!
9. Gently knock the L-cap into position. Use a
5 mm/0,2 inch mandrel (for example the locking pin
for the bevel gear ref.no. 502 02 61-03). This is a
basic carburettor adjustment. Further fine
adjustments, within the limits the caps allow, may be
necessary to achieve optimum performance. See
the Operator's Manual.
English – 39