Condition Cause Remedy
Chain lubrication sys‐
tem is supplying
insufficient chain oil.
► Increase oil feed rate.
The chain is over-ten‐
sioned.
► Tension chain properly.
Chainsaw is not
being used properly.
► Have correct use explained, then practice.
18.2 Clearing the Combustion
Chamber
► Engage the chain brake.
► Rotate the shroud fasteners (1) a quarter turn
counterclockwise.
► Remove the shroud (2).
► Pull off the spark plug boot (3).
► Unscrew the spark plug.
► Dry the spark plug.
WARNING
■ Unconfined sparks may occur if the starter grip
is pulled after the spark plug boot has been
removed. Sparks may cause a fire or an
explosion in an easily combustible or explo‐
sive environment. This can result in serious or
fatal injuries and damage to property.
►
Move the Master Control lever to posi‐
tion
and hold it there before pulling the
starter grip.
►
Move the Master Control lever to position
and hold it there.
► Pull the starter grip and guide it back several
times.
The combustion chamber is cleared.
► Insert and tighten down the spark plug.
► Press the spark plug boot (3) firmly home.
► Place the shroud (2) in position.
► Rotate the shroud fasteners (1) clockwise until
you hear a click.
The shroud fasteners are locked.
19 Specifications
19.1 STIHL MS 400 C-M Chainsaw
–
Displacement: 66.8 cc
–
Engine power to ISO 7293: 4.0 kW (5.4 bhp)
–
Idle speed to ISO 11681: 2,800 ± 50 rpm
–
Approved spark plug: NGK CMR6H from
STIHL
–
Electrode gap: 0.5 mm
–
Dry weight without guide bar and chain 5.8 kg
–
Max. fuel tank capacity: 600 cc (0.6 l)
–
Max. oil tank capacity: 325 cc (0.325 l)
19.2 Chain Sprockets and Chain
Speeds
The following chain sprockets may be used:
7-tooth for 3/8"
–
Maximum chain speed according to
ISO 11681: 28.9 m/s
–
Chain speed at maximum power: 21.7 m/s
19.3 Minimum Groove Depth of
Guide Bars
The minimum groove depth depends on the pitch
of the guide bar.
–
3/8" 6 mm
19 Specifications English
0458-788-0121-B 27
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