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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)
MS 280 C-Q
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
If the saw chain continues to keep
rotating in idle even after
adjustment, have the chain saw
checked by a servicing dealer.
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:
English
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