Stihl FS 45 User Manual

FS 45, FS 46
English
26
N Turn high speed screw (H)
counterclockwise as far as stop (no
more than 3/4 turn).
N Turn the low speed screw (L)
carefully clockwise as far as stop,
then turn it back 1.5 turns.
N Start and warm up the engine if
necessary.
N Adjust idle speed with the idle speed
screw (LA) so that the cutting
attachment does not rotate.
Fine Tuning
A slight correction of the setting of the
high speed screw (H) may be necessary
if engine power is not satisfactory when
operating at high altitude or at sea level.
Rule of thumb:
Turn the high speed screw (H) about
one quarter of a turn for every 1000 m
(3300 ft) change in altitude.
Conditions for adjustment
If a nylon line mowing head is used,
make sure the lines reach as far as the
limiter blade on the deflector.
N Carry out the standard setting
without disturbing the high speed
screw (H).
N Warm up the engine for about 3
minutes.
N Open the throttle wide.
At high altitude
N Turn the high speed screw (H)
clockwise (leaner), no further than
stop, until there is no further
noticeable increase in engine
speed.
At sea level
N Turn the high speed screw (H)
counterclockwise (richer), no further
than stop, until there is no further
noticeable increase in engine
speed.
It is possible that maximum engine
speed may be reached with the standard
setting in each case.
Aadjusting 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).
N Warm up the engine.
Engine stops while idling
N Turn the idle speed screw (LA)
slowly clockwise until the engine
runs smoothly – the cutting
attachment must not turn.
Cutting attachment rotates when engine
is idling
N Turn the idle speed screw (LA)
counterclockwise until the cutting
attachment stops moving and then
rotate the screw another 1/2 to 1
turn in the same direction.
If the cutting attachment continues to run
when the engine is idling, have your
machine checked and repaired by your
servicing dealer.
Erratic idling behavior, engine stops
even though setting of LA-screw has
been corrected, poor acceleration
Idle setting is too lean:
N Idle setting is too lean: Rotate the
low speed screw (L) about 1/4 turn
counterclockwise until the engine
runs and accelerates smoothly.
Erratic idling behavior
Idle setting is too rich
N Rotate the low speed screw (L)
about 1/4 turn clockwise until the
engine runs and accelerates
smoothly.
L
H
LA
233BA050 KN

Stihl FS 45 Specifications

General

Engine Displacement	27.2 cc
Power Output	0.75 kW
Cutting Diameter	380 mm
Engine Type	2-stroke
Shaft Type	Curved
Fuel Capacity	0.33 liters
Fuel Tank Capacity	0.33 liters
Cutting Width	380 mm
Engine Power	1.0 bhp
Vibration Levels Left/Right Handle	5.5/5.5 m/s²