32
English
FR 350, FR 450, FR 480
Adjusting Idle Speed
Engine stops while idling
:
Carry out standard setting with the
low speed screw (
L
).
:
Turn the idle speed screw (
LA
)
clockwise until the engine runs
smoothly – the cutting tool must not
rotate.
Cutting tool rotates when engine is
idling
:
Turn the idle speed screw (
LA
)
counterclockwise until the cutting
tool stops rotating – then turn the
screw about another
half to one full
turn
in the same direction from that
position.
Erratic idling behavior, poor
acceleration
:
Carry out standard setting with the
low speed screw (
L
).
Idle setting too lean:
:
Turn low speed screw (
L
)
counterclockwise until the engine
runs and accelerates smoothly.
It is usually necessary to change the
setting of the idle speed screw (
LA
)
after every correction to the low speed
screw (
L
).
Fine tuning the carburetor for
operation at high altitude
A slight correction may be necessary if
the engine does not run satisfactorily:
:
Check standard setting.
:
Warm up the engine.
:
Turn the high speed screw (
H
)
clockwise (leaner).
Install intake air preheating kit
4128 007 1001* to prevent air filter and
carburetor icing at temperatures below
10°C (14°F), in drifting snow and powder
snow.
:
Remove the standard air filter (
1
)
and install the winter air filter (
2
) in
its place.
:
Push shutter (
3
) up into to underside
of filter coverkels schieben. This is
the
winter position
(top
illustration).
*
See "Guide to Using this Manual"
Winter Operation
FR 450, FR 480
256BA047 KN
3
1
2
256BA048 KN
1
2
3
Summary of Contents for FR 350
Page 48: ...47 FR 350 FR 450 FR 480 English ...