5MS 440, MS 440 C
3. Specifications
3.1 Engine
Displacement: 70.7 cm
3
(4.31 cu.in)
Bore: 50 mm (1.97 in)
Stroke: 36 mm (1.42 in)
Engine power to ISO 7293: 4 kW (5.4 bhp)
at 9,500 rpm
Max. permissible engine speed
with bar and chain: 13,500 ± 150 rpm
Idle speed: 2,500 1
rpm
Clutch: Centrifugal clutch with three unlined
clutch shoes
Clutch engages at: 3,500 rpm
Crankcase leakage test
at gauge pressure: p
ü
= 0.5 bar (7.25 psi)
under vacuum: p
u
= 0.5 bar (7.25 psi)
3.2 Fuel System
Carburetor leakage test
at gauge pressure: p
ü
= 0.8 bar (11.6 psi)
Operation of tank vent at gauge
pressure: p
ü
= 0.3 bar (4.35 psi)
Fuel: as specified in instruction manual
3.3 Ignition System
Air gap between ignition module
and fanwheel: 0.15...0.3 mm (0.006...0.12in)
Spark plug (suppressed): Bosch WSR 6F
NGK BPMR 7A
Electrode gap: 0.5 mm (0.02 in)
3.4 Chain Lubrication
Fully automatic, speed-controlled oil pump with rotary piston
Oil delivery rate: 8...18 cm
3
/min
(0.49...1.1 cu.in/min) at 10,000 rpm
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