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Stihl MS 251 Manual

Stihl MS 251
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48 MS 231, MS 231 C, MS 251, MS 251 C
Using the ZAT 3 ignition tester
5910 850 4520
Before starting the test, install a
new spark plug in the cylinder
and tighten it down firmly.
: Connect spark plug boot to the
terminal (2).
: Attach the ground terminal (1) to
the spark plug.
: Use adjusting knob (4) to set the
spark gap to about 2 mm,
see window (3).
While using the ZAT 3, hold it only
by the handle (4) or position it in a
safe place. Keep fingers or other
parts of your body at least 1 cm
away from the spark window (3),
high voltage connection (2), ground
connection (5) and the ground
terminal (1).
High voltage – risk of electric shock.
165RA184 TG
1
2
3 4
165RA185 TG
1
2
3 4
5
Crank the engine quickly with the
rewind starter and check spark in
the testers window (3).
The engine may start and
accelerate during the test.
If a spark is visible in the
window (3), the ignition system is in
order.
If no spark is visible in the
window (3), check the ignition
system with the aid of the
troubleshooting chart, b 7.8
7.5 Spark Plug Boot / Ignition
Lead
The ignition module (1) and ignition
lead (2) form a unit. A new ignition
module must be installed if the
ignition lead is damaged.
Remove the shroud, b 6.4
Remove the spark plug boot and
pull the ignition lead out of the
guides, b 7.3
: Use suitable pliers to pull the leg
spring out of the spark plug boot.
2310RA127 TG
Unhook the leg spring from the
ignition lead.
Pull the boot off the ignition lead.
Installing
If the ignition module is new, use
a pointed tool to pierce the center
of the ignition lead’s insulation,
about 15 mm from the end of the
lead.
: Pinch the hook of the leg spring
into the pierced hole in the center
of the lead (arrow).
Coat the inside of the spark plug
boot with STIHL press fluid,
b 14
: Hold the ignition lead and leg
spring together and push them
into the spark plug boot.
165RA188 TG
2310RA128 TG
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Stihl MS 251 Specifications

General IconGeneral
Idle speed2800 RPM
Motor type2-stroke motor
Chain pitch1/308 \
Blade length450 mm
Product colorBlack, Grey, Orange
Motor speed (max)10000 RPM
Oil tank capacity0.2 L
Fuel tank capacity0.39 L
Engine displacement45.6 cm³
Kickback protectionYes
Engine power3 hp
Power sourceGasoline
Sound power level114 dB
Vibration emission3.9 m/s²
Sound pressure level103 dB
Weight and Dimensions IconWeight and Dimensions
Weight4900 g

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