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Set idle speed
Engine stops while idling
- Adjust to standard setting!
LA = Turn idle speed adjusting
screw (3) clockwise until the
cutting tool begins to move,
then back off one half-turn.
Cutting tool rotates while
engine is idling:
- Adjust to standard setting!
LA = Turn idle speed adjusting
screw (3) counterclockwise
until cutting tool no longer
rotates when engine idles,
then turn another half-turn in
same direction.
The carburetor does not have an
adjusting screw for the maximum
speed (H ).
The carburetor is tuned to ensure
that the engine is supplied with an
optimum fuel/air mixture in all ope-
rating conditions.
Setting a maximum limit for the
idle speed mixture also limits the
emissions at idle speed and part-
throttle operation.
Standard setting
The standard setting must be ob-
tained first when adjusting the car-
buretor for the first time.
L = Carefully turn the low-speed
adjusting screw (1) clockwise
as far as possible, then back
off one turn counterclockwise
(L = one turn open).
- Fit an approved cutting tool.
The following must additio-
nally be noted when changing
the mowing head:
- Set correct line length: every
nylon line must extend as far as
the blade on the deflector shield!
- Check and clean air filter if
necessary.
- Start engine and let it warm up.
Set idle speed
Engine stops when idling:
- Adjust to standard setting!
LA = Turn idle speed adjusting
screw (2) clockwise until the
cutting tool begins to move,
then back off one half-turn.
Mowing head rotates while
engine is idling:
- Adjust to standard setting!
LA = Turn idle speed adjusting
screw (2) counterclockwise
until mowing head no longer
rotates when engine idles,
then turn another half-turn in
same direction.
Adjustment
(one adjusting screw)
392RA119
1
L A
L
2
VA
392RA118
L A
3
VA
38