30
English / USA
FS 120, FS 120 R, FS 200, FS 200 R, FS 250, FS 250 R
: Lay your machine on its back with
the gearhead facing upward.
Cutting edges of (1) and (3) may
point in either direction.
Cutting edges of (2), (4) and (5)
must point clockwise.
Direction of rotation is marked by
arrow on inside of cutting head
deflector or limit stop.
: Place the cutting tool (6) on the
thrust plate (7).
Collar (see arrows) must locate in
cutting tool’s mounting hole.
: Slip thrust washer (8) and rider
plate (9) over the output shaft (10).
: Block the output shaft and
: Screw the mounting nut (11) with
the combination wrench (12) onto
the output shaft counterclockwise
and tighten down firmly.
If the mounting nut is too loose,
fit a new one.
Removing cutting tool
: Block the output shaft.
: Unscrew the nut clockwise.
: Removing the cutting tool – do not
remove the thrust plate (7).
This engine is certified to operate on
unleaded gasoline and the STIHL two-
stroke engine oil at a mix ratio of 50:1.
Your engine requires a mixture of high-
quality gasoline and quality two-stroke
air cooled engine oil.
Use mid-grade unleaded gasoline with a
minimum octane rating of 89 (R+M/2). If
the octane rating of the mid-grade
gasoline in your area is lower, use
premium unleaded fuel.
Fuel with a lower octane rating may
increase engine temperatures. This, in
turn, increases the risk of piston seizure
and damage to the engine.
The chemical composition of the fuel is
also important. Some fuel additives not
only detrimentally affect elastomers
(carburetor diaphragms, oil seals, fuel
lines, etc.), but magnesium castings and
catalytic converters as well. This could
cause running problems or even
damage the engine. For this reason
STIHL recommends that you use only
nationally recognized high-quality
unleaded gasoline!
Fuel
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General
Weight and Dimensions
