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Specifications
EPA / CEPA
The Emission Compliance Period
referred to on the Emissions
Compliance Label indicates the number
of operating hours for which the engine
has been shown to meet Federal
emission requirements.
Category
A = 300 hours
B = 125 hours
C = 50 hours
Engine
STIHL single cylinder two-stroke engine
MS 231
Displacement:
42.6 cc
Bore:
42.5 mm
Stroke:
30 mm
Engine power to
2.0 kW (2.7 bhp)
ISO 7293:
at 10,000 rpm
1)
Idle speed:
2,800 rpm
MS 251, MS 251 C
Displacement:
45.6 cc
Bore:
44 mm
Stroke:
30 mm
Engine power to
2.2 kW (3.0 bhp)
ISO 7293:
at 10,000 rpm
1)
Idle speed:
2,800 rpm
1)
to ISO 11681 +/- 50 rpm
48
Ignition System
Electronic magneto ignition
Spark plug (resistor
NGK CMR6H,
type):
BOSCH USR 4 A
C
Electrode gap:
0.5 mm
This spark ignition system meets all
requirements of the Canadian
Interference-Causing Equipment
Standard CAN ICES-2/NMB-2.
Fuel System
All position diaphragm carburetor with
integral fuel pump
Fuel tank capacity:
390 cc (0.39 l)
Chain Lubrication
Fully automatic, speed-controlled oil
pump with rotary piston
Oil tank capacity:
200 cc (0.2 l)
Weight
dry, without bar and chain
MS 231:
MS 251:
MS 251 C with ErgoStart and
quick chain tensioner:
Cutting Attachment
Actual cutting length may be less than
the specified length
STIHL cutting attachments complying
with CSA Standard Z 62.3:
.325" Rollomatic E guide bars
Cutting lengths:
Pitch:
Groove width:
Nose sprocket:
3/8" P Rollomatic E guide bars
Cutting lengths:
Pitch:
Groove width:
Nose sprocket:
.325" chain
Rapid Micro 3 (26 RM3) Type 3634
Rapid Duro 3 (26 RD3) Type 3667
Pitch:
Drive link gauge:
3/8" P chain
Picco Micro 3 (63 PM3) Type 3636
Picco Super 3 (63 PS3) Type 3616
Picco Duro 3 (63 PD3) Type 3612
Pitch:
Drive link gauge:
4.9 kg
Chain sprocket
4.9 kg
7-tooth for .325"
6-tooth for 3/8" P
5.2 kg
6-tooth for .325"
MS 231, MS 231 C, MS 251, MS 251 C
35, 40, 45 cm
.325" (8.25 mm)
1.6 mm
11-tooth
30, 35, 40, 45 cm
3/8" P (9.32 mm)
1.3 mm
9-tooth
.325" (8.25 mm)
1.6 mm
3/8" P (9.32 mm)
1.3 mm
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