Stihl Ms 250 C Manual

MS 250
English
29 STIHL MotoMix uses STIHL HP Ultra 
two-stroke engine oil suited for high 
performance engines.
For further details, see 
www.STIHLusa.com/ethanol
If not using MotoMix, use only STIHL 
two-stroke engine oil or equivalent high-
quality two-stroke engine oils that are 
designed for use in air cooled two-cycle 
engines.
The use of non-seasonal gasoline 
blends may increase the potential for 
pressure to build in the fuel tank during 
operation. For example, using a winder 
blend during the...

MS 250
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30
Opening
NRaise handle.
NTwist filler cap counterclockwise 
(approx. 1/4 turn).
Markings on filler cap and housing must 
align.NRemove the filler cap.
Refueling
Take care not to spill fuel while fueling 
and do not overfill the tank – leave 
approx. 1/2" (13 mm) air space.
Closing
Handle is in an upright position:
NPosition filler cap – markings on filler 
cap and housing must align.
NPush the filler cap down as far as it 
will go.NPush the filler cap down and twist it 
clockwise...

MS 250
English
31 Filler cap is now closed.
If the filler cap will not engage into the 
tank housing
The base of the filler cap is rotated in 
relation to the upper part.
NLook at the black alignment marks 
on the top of the filler cap.NWith the filler cap in the filling neck, 
twist it counterclockwise until it 
drops into its seat.
NContinue to twist the filler cap 
counterclockwise (approx. 1/4 turn) 
– this will twist the base of the cap 
into the correct position.
NWhile pushing down on the cap,...

MS 250
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32
Preparations
NThoroughly clean the oil filler cap 
and the area around it to ensure that 
no dirt falls into the tank.
NPosition the machine so that the 
filler cap is facing up.
NOpen the filler cap.
Filling chain oil tank
NRefill the chain oil tank every time 
you refuel.
Take care not to spill chain oil while 
refilling and do not overfill the tank.
NClose the filler cap.
There must still be a small amount of oil 
in the oil tank when the fuel tank is 
empty.
If the oil level in the...

MS 250
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33
Locking chain with chain brake
–in an emergency
–when starting
–at idling speed
The chain is stopped and locked when 
the hand guard is pushed toward the bar 
nose by the left hand – or when brake is 
activated by inertia in certain kickback 
situations.
Releasing the chain brake
NPull the hand guard back toward the 
front handle.
NOTICE
Always disengage chain brake before 
accelerating engine and before starting 
cutting work. The only exception to this 
rule is when you check...

MS 250
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34
At temperatures below +50°F (+10°C):
NSqueeze the throttle trigger lockout 
and move the Master Control lever 
to l (cold start).
NTurn the knob above the rear handle 
90° counterclockwise.
NLift off the carburetor box cover 
vertically.NLift out the shutter (in front of spark 
plug) vertically.
NTurn the shutter 180°.
NRefit the shutter.
NRefit the carburetor box cover and 
secure it with the knob.
Heated air is now drawn in from around 
the cylinder to warm the carburetor – this...

MS 250
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35
Setting the Master Control Lever
To move the Master Control lever from 
the normal run position (F) to choke 
closed (l), press down the throttle 
trigger lockout and squeeze the throttle 
trigger at the same time and hold them in 
that position – now set the Master 
Control lever.
To select the starting throttle 
position (n), move the Master Control 
lever to choke closed (l) first, then 
push it into the starting throttle 
position (n).
The Master Control lever must be in the 
choke...

MS 250
English
36 Between knees or thighs
NHold the rear handle tightly between 
your legs, just above the knees.
NHold the front handle firmly with 
your left hand – your thumb should 
be under the handle.
Cranking
NPull the starter grip slowly with your 
right hand until you feel it engage – 
and then give it a brisk strong pull 
and push down the front handle at 
the same time. Do not pull out the 
starter rope to full length – it might 
otherwise break. Do not let the 
starter grip snap back. Guide...

MS 250
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37 Versions with decompression valve
NPress in the button to open the 
decompression valve.
The decompression valve closes as 
soon as the engine fires.
NFor this reason you must press in 
the button before each starting 
attempt.All models
NPush the hand guard (1) forward – 
the chain is locked.
NPress down the trigger lockout (2) 
and pull the throttle trigger at the 
same time. Set Master Control 
lever (3) to:
Choke shutter closed (l)
–if the engine is cold (also use this 
position if...

MS 250
English
38 NPull the hand guard back toward the 
front handle.
The chain brake is now disengaged – 
your saw is ready for operation.
NOTICE
Always disengage chain brake before 
accelerating the engine. High revs with 
the chain brake engaged (chain locked) 
will quickly damage the clutch and chain 
brake.
At very low outside temperatures
NAllow engine to warm up at part 
throttle.
Stopping the Engine
NMove the Master Control lever to the 
stop position (0).
If engine does not start
If you did not...