Stihl Fs 450 K Manual

20 English / USA
FS 300, FS 350, FS 400, FS 450, FS 480 :Hold the lower clamp (1) steady.
:Unscrew and remove the clamp 
screw (2).
:Remove the upper clamp (3) from 
the lower clamp.
Upper and lower clamps are loose 
once the clamp screw has been 
removed.:Place the handlebar (4) in the lower 
clamp (1) so that distance A is no 
more than 15 cm (6 in).
:Place upper clamp in position and 
press it down.
:Fit the clamp screw.
:Line up handlebar at right angles to 
the drive tube.
:Tighten down the clamp...

21 FS 300, FS 350, FS 400, FS 450, FS 480English / USA
Some machine versions are equipped 
with a throttle cable adjuster in the 
control handle.
A properly adjusted throttle cable is 
the precondition for correct 
operation in the full throttle, starting 
throttle and idle positions.
Adjust the throttle cable only after 
the unit is fully assembled – the 
control handle must be in the normal 
operating position.
:Use a suitable tool to push the slide 
to the bottom of the slot (see 
illustration).:Press...

22 English / USA
FS 300, FS 350, FS 400, FS 450, FS 480Deflectors1 =Deflector for mowing tools
2 =Deflector for mowing heads
Mounting the Deflector
:Place the deflector in position.
:Fit the plate (3).
:Insert the screws and tighten them 
down firmly.
Limit Stop4 =Limit stop for circular saw blades.
Mounting the Limit Stop
:Place the stop in position.
:Insert the screws and tighten them 
down firmly.
If you use one of the mowing heads, 
note that the skirt (5) must be fitted onto 
the deflector (1):
All...

23 FS 300, FS 350, FS 400, FS 450, FS 480English / USA
Blocking the Drive Shaft:Insert the stop pin (1) in the bore (2) 
in the gearhead as far as stop, apply 
slight pressure.
:Rotate the output shaft until the stop 
pin slips into position.
:Use combination wrench (3) to 
loosen and unscrew the nut (4) 
clockwise.
:Remove the rider plate (5) and 
thrust washer (6).The guard ring (7) for mowing 
applications and guard washer (8) 
should be fitted to ensure optimum 
protection from grass cuttings when...

24 English / USA
FS 300, FS 350, FS 400, FS 450, FS 480STIHL PolyCut 40-3 Mowing Head:Block the output shaft with the stop 
pin.
:Position the mowing head on the 
shaft.
:Fit the thrust washer (6) – convex 
side must face down.
:Screw on the nut (4) counter-
clockwise and tighten it down 
firmly.
Remove the stop pin.
Removing the mowing head
:Block the output shaft.
:Unscrew the nut clockwise.
If the mounting nut is too loose, 
fit a new one.
Adjusting Nylon LineNote:
A detailed description is contained...

25 FS 300, FS 350, FS 400, FS 450, FS 480English / USA
Grass Cutting Blades,
Brush Knife:Place the cutting tool (1) in position.
Collar (see arrow) must engage the 
cutting tool’s mounting hole.
Grass cutting blade 255-8:
Cutting edges must point  
clockwise.
:Fit thrust washer (2) – convex side 
must face up.
:Fit rider plate (3) for mowing.
:Block the output shaft.
:Screw on nut (4) counterclockwise 
and tighten it down firmly.Removing the cutting tool
:Block the output shaft.
:Unscrew the nut...

26 English / USA
FS 300, FS 350, FS 400, FS 450, FS 480 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...

27 FS 300, FS 350, FS 400, FS 450, FS 480English / USA
Before fueling, clean the filler cap and 
the area around it to ensure that no dirt 
falls into the tank.
Always thoroughly shake the mixture in 
the can before fueling your machine.
In order to reduce the risk of burns 
or other personal injury from 
escaping gas vapor and fumes, 
remove the fuel filler cap carefully 
so as to allow any pressure build-up 
in the tank to release slowly..
After fueling, tighten down the filler 
cap by hand as securely...

28 English / USA
FS 300, FS 350, FS 400, FS 450, FS 480 :Attach machine to the harness. Let 
it go and check to see how it is 
balanced – change the attachment 
point of the spring hook as 
necessary:
Mowing tools (mowing heads, 
grass cutting blades, brush knives, 
Shredder blades) should just touch 
the ground (top illustration).
Circular saw blades should 
hover about 20 cm (8 in) above 
the ground (bottom illustration).
Starting:Observe safety precautions  – see 
section Safety Precautions in this...

29 FS 300, FS 350, FS 400, FS 450, FS 480English / USA
:Place the unit on the ground: 
It must rest securely on the engine 
support and the deflector. Check 
that the cutting tool is not touching 
the ground or any other obstacles.
:Make sure you have a firm footing.
:Press the unit firmly against the 
ground with your left hand.
Do not stand or kneel on the drive 
tube.
:Pull the starter grip slowly with your 
right hand until you feel it engage –
and then give it a brisk strong pull. 
Do not pull out...