FS 460 C-M, FS 460 C-M L, FS 490 C-M, FS 490 C-M L
English
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General Information
The M-Tronic controls fuel feed and 
ignition timing electronically in all 
operating conditions.  
M-Tronic guarantees simple and fast 
starts. The engine is started in the 
Start } position irrespective of climatic 
conditions or engine temperature. After 
starting, the Start } position can be 
maintained until the engine runs 
smoothly.
M-Tronic ensures optimum engine 
power at all times, very good 
acceleration and automatic adjustment 
to suit changing conditions.
For this reason there is no need to 
change the carburetor setting – the 
carburetor has no adjusting screws.
If the usual good running behavior and 
engine power are not reached after an 
extreme change in operating conditions, 
contact your servicing dealer for 
assistance.
STIHL recommends that you have 
servicing and repair work carried out 
exclusively by an authorized STIHL 
servicing dealer.
At temperatures below +50 °F (+10 °C):
Preheating the carburetor
Repositioning a shutter allows heated air 
to be drawn in from around the cylinder 
and mixed with cold air – this helps 
prevent carburetor icing.  
An arrow (1) on the shroud indicates the 
setting of the shutter (2) for summer or 
winter operation. Meaning of symbols:
– "Sun" = summer operation
– "Snow crystal" = winter operation
N Remove the screw (3) from the 
shutter.
N Pull the shutter (2) out of the shroud.
N Rotate the shutter (2) from the 
summer position to the winter 
position and refit it.
N Secure the shutter in position with 
the screw (3). 
At temperatures between 
+50 °F (+10 °C) and +70 °F (+20 °C)
The machine can normally be operated 
in this temperature range with the 
shutter (2) in the summer position. 
Change the position of the shutter if 
necessary.
M-Tronic Winter Operation