Maintenance And Repairs - Stihl FS 91 Instruction Manual

English
Cut-off speed (rated): 9,500 rpm
Max. output shaft
speed (cutting
attachment): 7,150 rpm
Valve clearance
Inlet valve: 0.10 mm
(0.004 in)
Exhaust valve: 0.10 mm
(0.004 in)
Ignition System
Electronic magneto ignition
Spark plug (resistor Bosch USR 7 A
type): C
Electrode gap: 0.5 mm (0.02 in)
Fuel System
All position diaphragm carburetor with
integral fuel pump
Fuel tank capacity: 0.71 l (24 fl.oz)
Weight
Dry, without cutting attachment and
deflector
FS 91: 5.8 kg (12.8 lbs)
FS 91 R: 5.5 kg (12.1 lbs)
Overall length
without cutting
attachment 1800 mm (71 in)
50
Features
R Loop Handle
Z Spark arresting screen in muffler

Maintenance and Repairs

Users of this unit should carry out only
the maintenance operations described
in this manual. STIHL recommends that
other repair work be performed only by
authorized STIHL servicing dealers
using genuine STIHL replacement parts.
Genuine 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.
For repairs of any component of this
unit's air emissions control system,
please refer to the air emissions
systems warranty in this manual.
FS 91, FS 91 R