Stihl MS 251 Manual

71MS 231, MS 231 C, MS 251, MS 251 C
10. Control Levers
10.1 Master Control Lever
The positions of the Master Control
lever are described in the instruction
manual.
10.1.1 Removing and Installing
– Remove the air filter, b 12.1
– Remove the choke rod,
b 10.3.3
– Pull the filter base off the studs,
b 12.3
– Remove the contact spring,
b 7.7.4
: Rotate the switch lever (1)
counterclockwise as far as stop
and pull it off the filter base's
shaft (2).
– Remove the short circuit
wire from the switch lever,
b 7.7.2
: Remove the switch lever (1),
check it and replace if necessary.
2310RA160 TG
2
1
2310RA161 TG
1
– Check the filter base and replace
it if necessary
Installing
– Position filter base in the
carburetor box.
: Position the switch lever (1) in the
carburetor box.
– Fit the short circuit wire on the
switch lever, b 7.7.2
: Position the switch lever (1) so
that the short circuit wire points
towards the filter base and the
opening (arrow) lines up with the
web (2).
2310RA162 TG
1
2
2310RA163 TG
1
: Push the switch lever (1) onto the
filter base's shaft (2) as far as
stop.
– Fit the contact spring, b 7.7.4
: Check operation
– short circuit wire's terminal
sleeve must touch the contact
spring (arrow) in position "
0".
– Reassemble all other parts in the
reverse sequence.
2310RA164 TG
2
1
2310RA155 TG
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Stihl MS 251 Specifications

General

Idle speed	2800 RPM
Motor type	2-stroke motor
Chain pitch	1/308 \
Blade length	450 mm
Product color	Black, Grey, Orange
Motor speed (max)	10000 RPM
Oil tank capacity	0.2 L
Fuel tank capacity	0.39 L
Engine displacement	45.6 cm³
Kickback protection	Yes
Engine power	3 hp
Power source	Gasoline
Sound power level	114 dB
Vibration emission	3.9 m/s²
Sound pressure level	103 dB

Weight and Dimensions

Weight	4900 g