Operation Manual

43MS 880
English / USA
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 the high speed screw (H)
counterclockwise (max.
1
/
2
turn) as
far as stop.
Turn low speed screw (L) clockwise as
far as stop. Then back it off one quarter
turn.
* See ²Guide to Using this Manual³
Adjusting Idle Speed
Engine stops while idling
: open low speed screw (L) one
quarter turn
: Turn the idle speed screw (LA)
clockwise until chain begins to run –
then back it off one quarter of a turn.
Chain runs when engine is idling
: open low speed screw (L) one
quarter turn
: Turn the idle speed screw (LA)
counterclockwise until chain stops
running – then turn screw another
quarter turn in the same direction.
Erratic idling behavior, poor
acceleration
(althogh low speed screw is open one
quarter turn)
Idle setting too lean:
: L =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).
L
H
171BA019 KN
L
H
1/2
1/4
L
LA
171BA020 KN
L
H
1/2
1/4
L
LA
171BA020 KN
L
H
1/2
1/4