Stihl Fs 90 R Manual

FS 90, FS 90 R
English
19 The following STIHL interchangeable 
attachments may be mounted on the 
basic machine:Mounting Bike Handle with Swivelling 
Handle Support
The machine is supplied with the 
swiveling handle support already 
mounted on the shaft. To mount the 
handlebar it is necessary to remove the 
clamp moldings.
Removing the clamp moldings
NHold the lower clamp (1) and upper 
clamp (2) firmly together.
NRelease the wing screw (3) – the 
clamps are loose once the wing 
screw has been released....

FS 90, FS 90 R
English
20 NPull out the wing screw – the 
washer (6) remains on the wing 
screw.
NSeparate the clamp moldings – the 
springs (4 and 5) remain in the 
lower clamp.
Securing the handlebar
NPlace the handlebar (7) in the lower 
clamp (1) so that distance A is no 
more than 15 cm (6 in). 
NPlace the upper clamp in position 
and hold both clamp moldings 
together.
NPush the wing screw through the 
two clamps as far as stop – hold all 
parts together and secure them.NPlace the secured assembly...

FS 90, FS 90 R
English
21 NPush the throttle cable (14) into the 
retainers (15).
Adjusting the throttle cable
NCheck adjustment of throttle cable – 
see chapter on "Adjusting the 
Throttle Cable".Swivelling the handlebar
Transport position
NLoosen the wing screw (3) and 
unscrew it until the handlebar (7) 
can be turned clockwise.
NTurn the handlebar 90° and then 
swing the handles down.
NTighten down the wing screw (3) 
firmly.
Working position
NReverse the sequence described 
above to swing...

FS 90, FS 90 R
English
22 NPlace the clamp (3) in the loop 
handle (4) and position them both 
against the drive tube (5).
NPosition the clamp (6) against the 
drive tube.
NPlace the barrier bar (2) in position 
as shown.
NLine up the holes.
NInsert the screws (7) in the holes 
and screw them into the barrier 
bar (2) as far as stop.
NGo to "Securing the Loop Handle".Mounting the Loop Handle without 
Barrier Bar
NPlace the clamp (3) in the loop 
handle (4) and position them both 
against the...

FS 90, FS 90 R
English
23 Some machine versions are equipped 
with a throttle cable adjuster on 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.
NUse a suitable tool to push the slide 
to the end of the slot (see 
illustration).
NPress down the throttle trigger...

FS 90, FS 90 R
English
24
Fitting the Skirt and Blade
WARNING
These parts must be fitted to the 
deflector (1) when you use a mowing 
head.
NSlide the lower guide slot of the skirt 
(4) onto the deflector (1) – it must 
snap into position.
NPush the blade (5) into the upper 
guide slot on the skirt and line it up 
with the first hole.
NInsert the screw and tighten it down 
firmly.
Mounting the Limit Stop
WARNING
Always fit the limit stop (6) when you use 
a circular saw blade.
NPosition the limit stop...

FS 90, FS 90 R
English
25 Depending on the cutting attachment, it 
may be necessary to use the nut (3), 
rider plate (4) and thrust washer (5).
These parts are included in a kit 
supplied with the machine and are also 
available as special accessories.
Removing the transport lock
NPull the hose (1) off the shaft (2).
Machine supplied without mounting 
hardware
Only mowing heads may be used which 
mount directly to the shaft (2).
Blocking the Shaft
The output shaft (2) must be blocked 
with the stop pin...

FS 90, FS 90 R
English
26 Fitting Mowing Head with Screw 
Mounting
Keep the instruction leaflet for the 
mowing head in a safe place.
NScrew the mowing head 
counterclockwise on to the shaft (1) 
as far as stop.
NBlock the shaft.
NTighten down the mowing head 
firmly.
NOTICE
Remove the tool used to block the shaft.
Removing the Mowing Head
NBlock the shaft.
NUnscrew the mowing head 
clockwise.
Mounting Metal Cutting Attachment
Keep the leaflet and packaging of the 
metal cutting attachment in a safe...

FS 90, FS 90 R
English
27
WARNING
If the mounting nut has become too 
loose, fit a new one.
NOTICE
Remove the tool used to block the shaft.
Removing the Metal Cutting Attachment
WARNING
Wear protective gloves to reduce the 
risk of direct contact with the sharp 
cutting edges.
NBlock the shaft.
NUnscrew the mounting nut 
clockwise.
NRemove cutting attachment and its 
mounting hardware from the 
gearbox – but do not remove the 
thrust plate (7).This engine is certified to operate on 
unleaded gasoline and...

FS 90, FS 90 R
English
28 discharge and resulting fire and/or 
explosion, do not fill fuel containers that 
are sitting in or on a vehicle or trailer.
The container should be kept tightly 
closed in order to limit the amount of 
moisture that gets into the mixture.
The machine’s fuel tank should be 
cleaned as necessary.
STIHL MotoMix
STIHL recommends the use of STIHL 
MotoMix. STIHL MotoMix has a high 
octane rating and ensures that you 
always use the right mix ratio. 
STIHL MotoMix uses STIHL HP Ultra...