Stihl MS 251 Manual

12 MS 231, MS 231 C, MS 251, MS 251 C
3.4 Rewind Starter
Condition Cause Remedy
Starter rope broken Rope pulled out too vigorously as
far as stop or over edge, i.e. not
vertically
Fit new starter rope
Normal wear Fit new starter rope
Starter rope does not rewind Rewind spring very dirty or
corroded
Clean or replace rewind spring
Insufficient spring tension Check rewind spring and increase
tension
Rewind spring broken Fit new rewind spring
Starter rope cannot be pulled out
far enough
Spring overtensioned Check rewind spring and reduce
tension
Starter rope can be pulled out
almost without resistance
(crankshaft does not turn)
Guide peg on pawl or pawl itself is
worn
Fit new pawl
Spring clip on pawl fatigued Fit new spring clip
Spring clip installed wrong Install spring clip correctly
...Models with ErgoStart Guide pegs on pawls or pawls
themselves are worn
Fit new pawls
Torsion springs on flywheel
fatigued, pawls worn or sticking
Clean seats on pawls or replace
pawls and torsion springs if
necessary
Lugs on carrier worn Install new carrier
Spring loop in spring housing not
attached to carrier
Attach spring loop to carrier
Starter rope is difficult to pull –
models with ErgoStart
Spring in spring housing fatigued Install new spring housing
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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