Download MS 251 Homeowner Chainsaw Instruction Manual

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Spark plug (resistor
type):
NGK CMR6H
Electrode gap:
0.02 in (0.5 mm)
Specifications
EPA / CEPA
Fuel System
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
All position diaphragm carburetor with
integral fuel pump
Fuel tank capacity:
13.2 fl.oz (0.39 L)
Chain Lubrication
A = 300 hours
B = 125 hours
C = 50 hours
Fully automatic, speed-controlled oil
pump with rotary piston
Engine
Weight
STIHL single cylinder two-stroke engine
dry, without bar and chain
MS 251
Oil tank capacity:
MS 251, MS 251 C
Displacement:
2.78 cu.in
(45.6 cm3)
1.73 in (44 mm)
1.18 in (30 mm)
3.0 hp (2.2 kW) at
9,500 rpm
2,800 rpm
Bore:
Stroke:
Engine power to
ISO 7293:
Idle speed:
High speed setting
when performing
repairs (with bar and
chain):
13,000 rpm
Ignition System
6.7 fl.oz (0.2 L)
Rollomatic E 3/8" P guide bars
Reduced kickback STIHL guide bar
(with green label)
Cutting lengths:
12, 14, 16, 18 in
(30, 35, 40, 45 cm)
Pitch:
3/8" P (9.32 mm)
Groove width:
0.050 in (1.3 mm)
Nose sprocket:
9-tooth
Rollomatic E .325" guide bars
Reduced kickback STIHL guide bar
(with green label)
Cutting lengths:
14, 16, 18 in (35,
40, 45 cm)
Pitch:
.325" (8.25 mm)
Groove width:
0.063 in (1.6 mm)
Nose sprocket:
11-tooth
3/8" P chain
MS 251 C with quick chain
adjuster and
Easy2Start:
11.0 lbs
(4.9 kg)
11.5 lbs
(5.2 kg)
Cutting Attachment
Recommended cutting attachments
complying with Section 5.11 of ANSI B
175.1-2000.
Observe notes on ANSI B 175.1-2000
and definition of "low kickback chain" in
chapter on "Safety Precautions and
Working Techniques".
Low kickback STIHL saw chains (with
green label)
Picco Micro 3 (63 PM3) Type 3636
Picco Super 3 (63 PS3) Type 3616
Picco Duro (63 PD3) Type 3612
Pitch:
3/8" P (9.32 mm)
Drive link gauge: 0.050 in (1.3 mm)
.325" saw chains
Low kickback STIHL saw chains (with
green label)
Rapid Micro 3 (26 RM3) Type 3634
Rapid Duro 3 (26 RD3) Type 3667
Pitch:
.325" (8.25 mm)
Drive link gauge: 0.063 in (1.6 mm)
Electronic magneto ignition
58
MS 251, MS 251 C