Adjusting Idle Speed; Checking The Spark Plug - Stihl BR 500 Manual De Instrucciones

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).
BR 500, BR 550, BR 600
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.
English / USA

Checking the Spark Plug

Wrong fuel mix (too much engine oil in
the gasoline), a dirty air filter and
unfavorable running conditions (mostly
at part throttle etc.) affect the condition of
the spark plug. These factors cause
deposits to form on the insulator nose
which may result in trouble in operation.
27