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5
MS 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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