Stihl MS 231 User Manual

5MS 231, MS 231 C, MS 251, MS 251 C
2. Specifications
2.1 Engine
MS 231 MS 251
Displacement: 40.6 cm
3
45.6 cm
3
Bore: 41.5 mm 44.0 mm
Stroke: 30.0 mm 30.0 mm
Engine power to ISO 7293: 2.0 kW (2.7 bhp)
at 9,500 rpm
2.2 kW (3.0 bhp)
at 9,500 rpm
Maximum permissible engine speed
with bar and chain: 13,000 rpm 13,000 rpm
Idle speed: 2,800 rpm 2,800 rpm
Clutch: Centrifugal clutch without
linings
Centrifugal clutch without
linings
Clutch engages at: 3,500 rpm 3,500 rpm
Crankcase leakage test
at gauge pressure: 0.5 bar
under vacuum: 0.5 bar
2.2 Fuel System
Carburetor leakage test at
gauge pressure: 0.8 bar
Operation of tank vent at
gauge pressure: 0.5 bar
Fuel: as specified in instruction
manual
2.3 Ignition System
Air gap between ignition
module and fanwheel: 0.30 (+ 0.05/- 0.10) mm
Spark plug (resistor type): NGK CMR 6 H
Electrode gap: 0.5 mm
2.4 Chain Lubrication
Speed-controlled Ematic oil pump
Oil delivery rate: 8.0 (+/3.0) cm
3
/min
at 10,000 rpm
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Stihl MS 231 Specifications

General

Power-to-Weight Ratio	2.4 kg/kW
Oilomatic Chain Pitch	3/8" P
Sound Pressure Level	103 dB(A)
Sound Power Level	114 dB(A)
Engine Power	2.0 kW
Weight	4.8 kg
Bar Length	35 cm / 40 cm
Fuel Capacity	390 cc
Chain Oil Capacity	200 ml
Vibration Level Left/Right	3.0/3.0 m/s²