MS 270, MS 270 C, MS 280, MS 280 C
English
30
Carburetor with high-speed screw (H)
Standard setting
N Switch off engine
N Check the air filter – clean or
replace it if necessary
N Check the spark arresting screen in
the muffler (present only in some
countries) – clean or replace it if
necessary
N Carefully turn the low speed
screw (L) clockwise as far as
possible – then back off 1/4 turn
Only machines with high speed
screw H
Turn the high speed screw (H)
counterclockwise as far as possible
(max. 3/4 turn)
Setting the idle speed
Engine stops when idling
N Set low speed screw (L) to standard
setting
N Turn the idle speed adjusting
screw (LA) clockwise until the saw
chain begins to rotate – then turn it
back 1 turn
Saw chain rotates at idle speed
N Set low speed screw (L) to standard
setting
N Turn the idle speed screw (LA)
counterclockwise until the saw
chain stops turning – then turn
another full turn in the same
direction
Speed erratic when idling; poor
acceleration (despite low speed
screw = standard setting)
N Set low speed screw (L) to standard
setting
N Idle setting too lean – turn low
speed screw (L) counterclockwise
until the engine runs uniformly and
accelerates correctly – max. up to
the stop
Whenever the low speed screw (L) has
been adjusted, it is usually also
necessary to adjust the idle speed
adjusting screw (LA).
Only machines with intelligent engine
management
N Open the throttle fully for approx.
10 seconds – the chain and guide
bar must be fitted
N Carry out a cut to length under full
load
only machines with high speed
screw (H) – correcting the carburetor
setting for use at high altitudes
The setting may have to be marginally
corrected if engine performance is
unsatisfactory at high altitudes:
L
146BA014 KN
H
L
H
146BA012 KN
If the saw chain continues to keep
rotating in idle even after
adjustment, have the chain saw
checked by a servicing dealer.
L
146BA013 KN
LA
L
146BA013 KN
LA
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