Stihl MS 650

5MS 650, MS 660
3. Specifications
3.1 Engine
MS 650 MS 660
Displacement: 84.9 cm
3
91.6 cm
3
Bore: 52 mm 54 mm
Stroke: 40 mm 40 mm
Engine power to ISO 7293: 4.8 kW (6.5 bhp)
at 9,500 rpm
5.2 kW (7.1 bhp)
at 9,500 rpm
Max. permissible engine speed
with bar and chain:
13,500 rpm
(carburetor with limiter caps)
13,000 rpm
(carburetor without limiter
caps)
13,500 rpm
(carburetor with limiter caps)
13,000 rpm
(carburetor without limiter
caps)
Idle speed: 2,500 rpm 2,500 rpm
Clutch: Centrifugal clutch without linings
Clutch engages at: 3,000 rpm 3,000 rpm
Crankcase leakage test
at gauge pressure: 0.5 bar 0.5 bar
under vacuum: 0.5 bar 0.5 bar
3.2 Fuel System
Carburetor leakage test
at gauge pressure: 0.8 bar
Operation of tank vent at
gauge pressure: 0.3 bar
Fuel: as specified in instruction
manual
3.3 Ignition System
Air gap between ignition
module and fanwheel: 0.15 – 0.3 mm
Spark plug (suppressed): Bosch WSR 6 F
NGK BPMR 7 A
Electrode gap: 0.5 mm
3.4 Chain Lubrication
Fully automatic, speed-controlled oil pump with rotary piston
Oil delivery rate: 5.5 – 15 cm
3
at 10,000 rpm