Adjusting Idle Speed - Stihl FS 75 Manual De Instrucciones

Rule of thumb
Turn high speed screw (H) about
1/4 turn for every 1000m (3300 ft)
change in altitude.
Conditions for adjustment
Make sure the cutting lines are full
length (as far as limiter blade on the
deflector).
:
Carry out standard setting.
: Warm up engine for about 3
minutes.
:
Open the throttle wide.
At high altitude
:
Turn high speed screw (H) clock-
wise (leaner) no further than stop
until there is no noticeable increase
in engine speed.
At sea level
: Turn high speed screw (H) counter-
clockwise (richer) no further than
stop until there is no noticeable
increase in engine speed.
It is possible that maximum engine
speed may be reached with the
standard setting in each case.
FS 75

Adjusting Idle Speed

It is usually necessary to change the
setting of the idle speed screw (LA)
after every correction to the low speed
screw (L).
:
Warm up engine for about 3
minutes.
Engine stops while idling
:
Turn idle speed screw (LA) slowly
clockwise until the engine runs
smoothly – cutting head must not
rotate.
Cutting head rotates when engine is
idling
:
Turn idle speed screw (LA) slowly
counterclockwise until cutting blade
stops rotating and then turn the
screw about another 1/2 to 1 turn in
the same direction.
Erratic idling behavior, engine stops
even though setting of LA screw is
correct, poor acceleration
Idle setting too lean:
: Turn low speed screw (L)
counterclockwise (about 1/4 turn)
until the engine runs and
accelerates smoothly.
English / USA
Erratic idling behavior
Idle setting too rich:
:
Turn low speed screw (L) clockwise
(about 1/4 turn) until the engine runs
and accelerates smoothly.
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