English
Category:
A = 300 hours
B = 125 hours
C = 50 hours
22.2
STIHL FS 251 R
– Displacement: 2.50 cu. in. (41.6 cm³)
– Engine power: 2.7 bhp (2.0 kW)
– Idle speed according to ISO 11681:
2800 ± 150 rpm
– Maximum engine speed: 10500 rpm
– Max. output shaft speed (cutting attachment):
7930 rpm
– Recommended spark plugs: NGK CMR6H by
STIHL
– Spark plug electrode gap: 0.02 in. (0.5 mm)
– Weight without fuel, deflector and cutting
attachment: 14.6 lbs (6.6 kg)
– Maximum fuel tank volume: 25.4 oz. (0.75 l)
– Length: 73.5 in. (1865 mm)
Do not use NMMA or TCW rated (2-cycle water
cooled) mix oils or other mix oils that state they
are for use in both water cooled and air cooled
engines (e.g., outboard motors, snowmobiles,
chain saws, mopeds, etc.).
22.3
Symbols on the Power Tool
and Deflector
Fuel Tank
Shutter configuration for winter operation
Shutter configuration for summer operation
23 Approved Deflector, Cutting Attachment and Harness Combi‐
nations
23.1
STIHL FS 251 R
The FS 251 R is approved for use only with the following cutting attachments:
Cutting Attachments
Mowing heads:
– AutoCut 25-2 (1)
– AutoCut 27-2 (2)
– AutoCut 36-2 (3)
– AutoCut C 26-2 (4)
– DuroCut 20-2 (5)
– SuperCut 20-2 (6)
– TrimCut C 32-2 (7)
Diameter of 9 in. (230 mm)
– Grass Cutting Blade
Grass-4 (8)
36
23 Approved Deflector, Cutting Attachment and Harness Combinations
Deflectors
– Deflector for Mowing
Heads (11)
– Deflector for Metal
Cutting Attachments
with Skirt and Line
Limiting Blade (12)
– Deflector for Metal
Cutting Attachments
without Skirt (13)
Manual Fuel Pump
Position of the choke lever: Engine runs or
can fire
Position of the choke lever: Used to start a
warm engine
Position of the choke lever: Used to start a
cold engine
Stop Switch.
Symbol on the deflector showing
proper direction of rotation for the cut‐
ting attachment.
Maximum allowable diameter of the
cutting attachment
Rated speed of the cutting attachment.
Unit: rpm (1/min)
STIHL products must not be disposed of in
the household trash, but only in accord‐
ance with local, state and federal laws and
regulations and as provided in this manual,
25.
22.4
Engineering Improvements
STIHL's philosophy is to continually improve all
of its products. As a result, engineering changes
and improvements are made from time to time.
Therefore, some changes, modifications and
improvements may not be covered in this man‐
ual. If the operating characteristics or the appear‐
ance of your machine differs from those descri‐
bed in this manual, please contact your STIHL
dealer or the STIHL distributor in your area for
assistance.
Handle
– Loop Han‐
dle (14)
– Loop Handle
with Barrier
Bar (15)
– Loop Handle
with Barrier
Bar (15)
Harnesses
– Shoulder Strap (16)
– Full Harness (17) with
a quick-release sys‐
tem
0458-853-8201-A