Stihl MS 441

5MS 441, MS 441 C
3. Specifications
3.1 Engine
MS 441
Displacement: 70.7 cm
3
Bore: 50 mm
Stroke: 36 mm
Engine power to ISO 7293: 4.1 kW (5.8 HP)
at 9,500 rpm
Max. permissible engine speed
(with bar and chain): 13,500 rpm
Idle speed: 2,800 rpm
Clutch: Centrifugal clutch without linings
Clutch engages at: 3,700 rpm
Crankcase leakage test
at gauge pressure: p
ü
= 0.5 bar
under vacuum: p
u
= 0.5 bar
3.2 Fuel system
Carburetor leakage test
at gauge pressure: p
ü
= 0.8 bar
Operation of tank vent
at gauge pressure: p
ü
= 0.5 bar
Fuel: as specified in instruction
manual
3.3 Ignition system
Air gap between ignition
module and fan wheel: 0.15...0.35 mm
Spark plug (suppressed): NGK BPMR 7 A
Electrode gap: 0.5 mm
3.4 Chain lubrication
Speed-controlled oil pump with reciprocating piston –
manual oil flow control
Oil delivery rate: 6.0...17 cm
3
/min
at 10,000 rpm
Oil pump with elevated
oil flow:
6.0...24 cm
3
/min
at 10,000 rpm