FS 260 C, FS 360 C
English
38
N Check electrode gap (A) and 
readjust if necessary – see 
"Specifications".
N Use only resistor type spark plugs of 
the approved range.
Rectify problems which have caused 
fouling of spark plug:
N Too much oil in fuel mix.
N Dirty air filter.
N Unfavorable running conditions, 
e.g. operating at part load.
Fit a new spark plug after approx. 100 
operating hours or earlier if the 
electrodes are badly eroded.
WARNING
To reduce the risk of fire and burn injury, 
use only spark plugs authorized by 
STIHL. Always press spark plug boot (2) 
snugly onto spark plug terminal (1) of the 
proper size. (Note: If terminal has 
detachable SAE adapter nut, it must be 
attached.) A loose connection between 
spark plug boot and ignition wire 
connector in the boot may create arcing 
that could ignite combustible fumes and 
cause a fire.
Installing the Spark Plug
N Screw the spark plug into the 
cylinder.
N Press the spark plug boot firmly 
onto the spark plug.
N Fit the cap (1) on the shroud from 
the rear and push the lug (2) into the 
opening (3) in the shroud at the 
same time.
N Swing the cap forwards onto the 
shroud, insert and tighten down the 
screw (4) firmly.
If engine running behavior is still 
unsatisfactory after the air filter has been 
serviced and the carburetor and throttle 
cable have been adjusted correctly, the 
cause may also be in the muffler.
Have the muffler checked for 
contamination (coking) by a servicing 
dealer!
STIHL recommends that maintenance 
and repair work be carried out only by 
authorized STIHL dealers.
Engine Running Behavior