Owner's Manual

FS 90, FS 90 R
English
49
Ignition system
Electronic magneto ignition
Fuel system
All position diaphragm carburetor with
integral fuel pump
Weight
Contact your STIHL dealer for
information regarding special
accessories that may be available for
your product.
Users of this unit should carry out only
the maintenance operations described
in this manual. Other repair work may be
performed only by authorized STIHL
service shops.
Warranty claims following repairs can be
accepted only if the repair has been
performed by an authorized STIHL
servicing dealer using original STIHL
replacement parts.
Original STIHL parts can be identified by
the STIHL part number, the {
logo and, in some cases, by the STIHL
parts symbol K. The symbol may
appear alone on small parts.
Displacement: 1.72 cu. in.
(28.4 cm
3
)
Bore: 1.50 in. (38 mm)
Stroke: 0.98 in. (25 mm)
Engine power to
ISO 8893:
1.3 hp (0.95 kW)
at 7000 rpm
Idle speed: 2800 rpm
Cut-off speed (nomi-
nal value): 10500 rpm
Max. output shaft
speed (cutting attach-
ment mount): 7500 rpm
Valve clearance
Inlet valve: 0.004 in.
(0.10 mm)
Exhaust valve: 0.004 in.
(0.10 mm)
Spark plug
(suppressed): Bosch USR 7 AC
Electrode gap: 0.02 in. (0.5 mm)
Fuel tank capacity: 17.9 fl.oz (0.53 l)
dry, without cutting attachment and
deflector
FS 90: 12.8 lbs. (5.8 kg)
FS 90 R: 12.1 lbs. (5.5 kg)
Special Accessories Maintenance and Repairs