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33FS 300, FS 350, FS 400, FS 450, FS 480
English / USA
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).
Mount the "Intake Air Preheating" kit
4128 007 1001* to prevent the air filter
and carburetor icing up at temperatures
below +10°C/ +50°F and in powdery or
drifting snow.
: Remove the standard air filter (1).
: Install the special filter (2) for winter
operation.
: Push cover (3) up against the
underside of the filter cover. This is
the winter position (upper
illustration).
* see "Guide to Using this Manual"
Winter Operation
FS 400, 450, 480
256BA047 KN
3
1
2
256BA048 KN
1
2
3
34


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