Stihl MS 251 C-Q

MS 251 C-Q
English
47
Engine
STIHL single cylinder two-stroke engine
MS 251 C
Ignition System
Electronic magneto ignition
Fuel System
All position diaphragm carburetor with
integral fuel pump
Chain Lubrication
Fully automatic, speed-controlled oil
pump with rotary piston
Weight
Cutting attachment
The actual cutting length can be less
than the specified cutting length.
.325" Rollomatic E guide bars
3/8" P Rollomatic E guide bars
.325" chain
3/8" P chain
Chain sprocket
As a rule, the mean chain velocity in
operation is about 20% lower than the
maximum chain velocity in accordance
with ISO 11681. Contact your STIHL
servicing dealer for advice on personal
protective equipment.
Noise and Vibration Data
For further details on compliance with
Vibration Directive 2002/44/EC see
www.stihl.com/vib.
Sound pressure level L
p
to ISO 22868
Sound power level L
w
to ISO 22868
Vibration measurement a
hv, eq
to
ISO 22867
The K-factor in accordance with
Directive 2006/42/EC is 2.5 dB(A) for
the sound pressure level and sound
power level; the K-factor in accordance
with Directive 2006/42/EC is 2.0 m/s
2
for the vibration measurement.
Specifications
Displacement: 45.6 cc
Bore: 44 mm
Stroke: 30 mm
Engine power to
ISO 7293:
2.2 kW (3.0 bhp)
at 10,000 rpm
Idle speed:
1
1)
to ISO 11681 +/- 50 rpm
2,800 rpm
Spark plug (resistor
type): NGK CMR6H
Electrode gap: 0.5 mm
Fuel tank capacity: 390 cc (0.39 l)
Oil tank capacity: 200 cc (0.2 l)
Weight (dry, without bar and chain):
MS 251 C: 5.3 kg
Cutting lengths: 35, 40, 45 cm
Pitch: .325" (8.25 mm)
Groove width: 1.6 mm
Nose sprocket: 11-tooth
Cutting lengths: 30, 35, 40, 45 cm
Pitch: 3/8" P (9.32 mm)
Groove width: 1.3 mm
Nose sprocket: 9-tooth
Rapid Micro 3 (26 RM3) Type 3634
Rapid Duro 3 (26 RD3) Type 3667
Pitch: .325" (8.25 mm)
Drive link gauge: 1.6 mm
Picco Micro 3 (63 PM3) Type 3636
Picco Super 3 (63 PS3) Type 3616
Picco Duro 3 (63 PD3) Type 3612
Pitch: 3/8" P (9.32 mm)
Drive link gauge: 1.3 mm
7-tooth for .325"
Max. chain velocity to
ISO 11681 25.6 m/s
6-tooth for 3/8" P
Max. chain velocity to
ISO 11681 24.8 m/s
MS 251 C: 103 dB(A)
MS 251 C: 114 dB(A)
Handle, left Handle, right
MS 251 C: 3.9 m/s
2
3.9 m/s
2