Adjusting Idle Speed - Stihl KM 55 Manual De Instrucciones

Standard Setting
: Shut off the engine.
: Mount the CombiTool.
: Check the air filter and clean or
replace as necessary.
: Turn high speed screw (H)
counterclockwise (max.
far as stop.
: Carefully screw the low speed
screw (L) down onto its seat. Then
open it one full turn counter-
clockwise.
: Start and warm up the engine.
: Adjust idle speed with the idle speed
screw (LA) so that the tool does not
move.
* see "Guide to Using this Manual"
KM 55
Fine Tuning for Operation at High
Altitude or at Sea Level
A slight correction of the setting of the
high speed screw (H) may be necessary
if engine power is not satisfactory when
operating at high altitude, at sea level or
after changing the cutting tool.
3
/ turn) as
4
: Carry out standard setting.
: Warm up engine for about 3 minutes
at full throttle.
Rule of thumb
Turn high speed screw (H) about
turn for every 3300 ft (1000m)
change in altitude.
At high altitude
: Turn high speed screw (H) clock-
wise (leaner) no further than stop.
At sea level
: Turn high speed screw (H) counter-
clockwise (richer) no further than
stop.
Maximum engine speed is normally
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 the engine for about 3
minutes.
Engine stops while idling
: Turn idle speed screw (LA) slowly
clockwise until the engine runs
smoothly – the tool must not move.
1
/
4
CombiTool moves when engine is
idling
: Turn idle speed screw (LA) counter-
clockwise until the tool stops moving
and then turn the screw about
1
another / to 1 turn in the same
2
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 (about
until the engine runs and
accelerates smoothly.
English / USA
1
/ turn)
4
21