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English / USA
MS 270, MS 270 C, MS 280, MS 280 C
Standard Setting
: Shut off the engine.
: Check the air filter and clean or
replace if necessary.
: Check spark arresting screen* in the
muffler and clean or replace it as
necessary.
Turn low speed screw (L) clockwise as
far as stop. Then back it off one quarter
turn.
Only machines with high speed
screw (H)
Turn the high speed screw (H)
counterclockwise (max.
3
/
4
turn) as far
as stop.
* See "Guide to Using this Manual"
Adjusting Idle Speed
Engine stops while idling
: Check the standard setting at the
low speed screw (L).
: Turn the idle speed screw (LA)
clockwise until chain begins to run –
then back it off one turn.
Chain runs when engine is idling
: Check the standard setting at the
low speed screw (L).
: Turn the idle speed screw (LA)
counterclockwise until chain stops
running – then turn screw another
turn in the same direction.
If the chain continues moving when
the engine is idling, have your saw
checked and repaired by your
servicing dealer.
Erratic idling behavior, poor
acceleration
: Check the standard setting at the
low speed screw (L).
Idle setting too lean:
: Turn low speed screw (L)
counterclockwise until the engine
runs and accelerates smoothly –
no further than stop.
It is usually necessary to change the
setting of the idle speed screw (LA)
after every correction to the low speed
screw (L).
Machines with Intelligent Engine
Management
: Run the engine for about 10
seconds at full throttle – with the
chain and bar mounted.
: Perform cross cut at full throttle.
L
H
146BA012 KN
L
146BA013 KN
LA
L
146BA014 KN
H