Stihl MS 261 User Manual

5MS 261, MS 261 C
2. Specifications
2.1 Engine
MS 261
Displacement: 50.2 cm
3
Bore: 44.7 mm
Stroke: 32.0 mm
Engine power to ISO 7293: 2.8 kW (3.8 bhp)
at 9,500 rpm
Maximum permissible engine speed
with bar and chain: 14,000 rpm
Idle speed: 2,800 rpm
Clutch: Centrifugal clutch without
linings
Clutch engages at: 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
BOSCH WSR6F
Electrode gap: 0.5 mm
2.4 Chain Lubrication
Speed-controlled oil pump with reciprocating piston and
manual flow control
Settings for oil delivery rate:
min.:
Ematic
max.:
4.5 (+/2.0) cm
3
/min
at 10,000 rpm
8.5 (+/3.0) cm
3
/min
at 10,000 rpm
11.5 (+/3.0) cm
3
/min
at 10,000 rpm

Stihl MS 261 Specifications

General

Motor type	2-stroke motor
Chain gauge	1.6 mm
Chain pitch	3/8 \
Blade length	400 mm
Automatic oiling	Yes
Oil tank capacity	0.27 L
Fuel tank capacity	0.5 L
Engine displacement	50.2 cm³
Engine power	3.8 hp
Power source	Gasoline

Weight and Dimensions

Weight	5200 g