Adjusting Idle Speed - Stihl BR 500 Manual De Instrucciones

English / USA
Standard Setting
: Shut off the engine.
: Check the air filter and replace if
necessary.
: Check adjustment of throttle cable
and adjust if necessary – see
"Adjusting the Throttle Cable".
: Check the spark arresting screen* in
the muffler – clean or replace as
necessary.
: Carefully screw both adjusting
screws counterclockwise as far as
stop:
High speed screw (H) is open 3/4
turn.
Low speed screw (L) is open 3/4
turn.
: Start and warm up the engine.
* see "Guide to Using this Manual"
24

Adjusting Idle Speed

Engine stops while idling
: Turn the idle speed screw (LA)
slowly clockwise until the engine
runs smoothly.
Erratic idling behavior, engine stops
in spite of correction to setting of LA
screw, poor acceleration
Idle setting too lean:
: Turn low speed screw (L)
counterclockwise (no further than
stop) until the engine runs and
accelerates smoothly, but no further
than stop.
Erratic idling behavior
Idle setting too rich:
: Turn low speed screw (L) clockwise
(no further than stop) until the
engine runs and accelerates
smoothly
It is usually necessary to change the
setting of the idle speed screw (LA)
after every correction to the low speed
screw (L).
Fine tuning the carburetor for
operation at high altitude
A slight correction may be necessary if
the engine does not run satisfactorily:
: Check the standard setting.
: Warm up the engine.
: Turn the high speed screw (H)
slightly clockwise (leaner) – no
further than stop.
If the setting is too lean there is
a risk of engine damage due to
insufficient lubrication and
overheating.
BR 500, BR 550, BR 600