5
MS 271 C, MS 291 C
2.
Specifications
2.1
Engine
MS 271
MS 291
Displacement:
50.2 cm
3
55.5 cm
3
Bore:
44.7 mm
47.0 mm
Stroke:
32.0 mm
32.0 mm
Engine power to ISO 7293:
2.6 kW (3.5 bhp)
at 9,500 rpm
2.8 kW (3.8 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:
3,600 rpm
3,600 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:
0.20 (+ 0.1/- 0.05) mm
Spark plug (resistor type):
NGK BPMR 7 A
Electrode gap:
0.5 mm
2.4
Chain Lubrication
Speed-controlled oil pump with reciprocating piston
Oil delivery rate:
8.0 (+/2.0) cm
3
/min
at 10,000 rpm
