Stihl FS 91 Instruction Manual - Page 50

Maintenance and Repairs

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English Displacement: 28.4 cc (1.72 cu.in) Bore: 38 mm (1.50 in) Stroke: 25 mm (0.98 in) Engine power to ISO 0.95 kW 8893: (1.3 bhp) at 7,000 rpm Idle speed: 2,800 rpm 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 Overall length without cutting attachment Features 1800 mm (71 in) 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. Dry, without cutting attachment and deflector FS 91: 5.8 kg (12.8 lbs) FS 91 R: 5.5 kg (12.1 lbs) 48 FS 91, FS 91 R

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FS 91, FS 91 R
English
48
Ignition System
Electronic magneto ignition
Fuel System
All position diaphragm carburetor with
integral fuel pump
Weight
Overall length
Features
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.
Displacement:
28.4 cc
(1.72 cu.in)
Bore:
38 mm (1.50 in)
Stroke:
25 mm (0.98 in)
Engine power to ISO
8893:
0.95 kW
(1.3 bhp) at
7,000 rpm
Idle speed:
2,800 rpm
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)
Spark plug (resistor
type):
Bosch USR 7 A
C
Electrode gap:
0.5 mm (0.02 in)
Fuel tank capacity:
0.71 l (24 fl.oz)
Dry, without cutting attachment and
deflector
FS 91:
5.8 kg (12.8 lbs)
FS 91 R:
5.5 kg (12.1 lbs)
without cutting
attachment
1800 mm (71 in)
R
Loop Handle
Z
Spark arresting screen in muffler
Maintenance and Repairs