Stihl MS 391 User Manual

50 MS 311, MS 391
Machine runs trouble-free,
no further action necessary
no
Install new ignition
b 7.3
yes
no
– Look for fault in fuel system or
carburetor
– Check engine for leaks
– Check position of flywheel on
crankshaft,
b 7.6, b 6.5
yes
Check operation
of switch shaft:
– Short circuit wire chafed?
– Function between contact spring and switch
shaft contact:
– Position "F" = no connection
– Position "
0" = connection
– Install new short circuit wire if necessary,
b 7.7.2
2
3
Powerful
spark?
Engine
runs?

Stihl MS 391 Specifications

General

Motor type	2-stroke motor
Chain gauge	1.6 mm
Chain pitch	3/8 \
Automatic oiling	Yes
Oil tank capacity	0.35 L
Fuel tank capacity	0.6 L
Engine displacement	64.1 cm³
Engine power	4.4 hp
Power source	Gasoline

Weight and Dimensions

Weight	6200 g