Spark Arresting Screen In Muffler - Stihl KM 90 Instruction Manual

At high altitudes
: Turn the high speed screw (H)
clockwise (leaner) no further than
stop until there is no noticeable
increase in engine speed.
At sea level
: Turn the high speed screw (H)
counterclockwise (richer) no further
than stop until there is no noticeable
increase in engine speed
It is possible that maximum engine
speed will already be reached with
the standard setting in each case.
Adjusting Idle Speed
It is usually necessary to change the
setting of the idle speed screw (LA)
after every correction to the low speed
screw (L).
: Warm up engine
Engine stops while idling
: Turn idle speed screw (LA) slowly
clockwise until the engine runs
smoothly – tool must not move.
KM 90, KM 90 R
Tool moves when engine is idling
: Turn idle speed screw (LA) slowly
counterclockwise until tool stops
moving and then turn the screw
about another 1/2 to 3/4 turn in the
same direction.
Erratic idling behavior, engine stops
even though setting of LA screw is
correct, poor acceleration
Idle setting too lean:
: Turn low speed screw (L)
counterclockwise until the engine
runs and accelerates smoothly.
Erratic idling behavior
Idle setting too rich:
: Turn low speed screw (L) clockwise
(no further than stop) until the
engine runs and accelerates
smoothly.
Spark Arresting Screen in
Muffler
The spark arresting screen is an option
that is not fitted in all machines.
: If the engine is low on power, check
the spark arresting screen in the
muffler.
: Wait for muffler to cool down.
: Move slide control to STOP-O.
: Remove the screw (1).
3
2
: Remove the screws (2).
: Lift away the shroud (3).
English
1
2
23