3.1 Engine
MS 270 MS 280
Displacement: 49.6 cm3 54.2 cm3
Bore: 44.0 mm 46.0 mm
Stroke: 32.6 mm 32.6 mm
Engine power to ISO 7293: 2.6 kW (3.54 HP)
at 9,500 rpm
2.8 kW (3.81 HP)
at 9,500 rpm
Max. permissible engine
speed (with bar and chain): 13,500 ± 150 rpm 13,500 ± 150 rpm
Idle speed: 2,800 rpm 2,800 rpm
Clutch: Three-shoe centrifugal
clutch without linings
Three-shoe centrifugal
clutch without linings
Clutch engages at: 3,300 rpm 3,300 rpm
Crankcase leakage test
– at gauge pressure:
– under vacuum:
60 kPa (0.6 bar)
40 kPa (0.4 bar)
2.1 Engine
MS 271 MS 291
Displacement: 50.2 cm3 55.5 cm3
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