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57BR 340, BR 340 L, BR 420, BR 420 C
español / EE.UU
Ajuste estándar
: Apague el motor.
: Gire el tornillo de ajuste de veloci-
dad alta (H) y el tornillo de ajuste de
velocidad baja (L) en sentido con-
trahorario hasta su tope (no más
que
1
/
4
de vuelta).
Ajuste de ralentí
El motor se para durante el funciona-
miento a ralentí
: Efectúe el ajuste estándar del torni-
llo de velocidad baja.
: Gire el tornillo de ajuste de ralentí
(LA) en sentido horario hasta que el
motor funcione de modo uniforme.
Funcionamiento irregular a ralentí,
aceleración deficiente
: Efectúe el ajuste estándar del torni-
llo de velocidad baja.
: Gire el tornillo de ajuste de veloci-
dad baja (L) en sentido contrahora-
rio hasta que el motor funcione y se
acelere de modo uniforme.
Normalmente es necesario cambiar el
ajuste del tornillo de ajuste de ralentí
(LA) después de cada ajuste del tornillo
de baja velocidad (L).
Ajuste fino para trabajo a alturas
grandes o a nivel del mar
Puede ser necesario efectuar un ajuste
ligero si la potencia del motor no es
adecuada para trabajar en alturas
grandes o al nivel del mar:
: Revise el ajuste estándar.
: Caliente el motor.
: Gire el tornillo de ajuste de veloci-
dad alta (H) en sentido horario
(mezcla más pobre) – en los mode-
los con tapas limitadoras (H = 1/4),
pero no más allá del tope.
Si el ajuste es demasiado pobre
existe riesgo de dañar el motor
debido a una lubricación insufi-
ciente y sobrecalentamiento.
H
L
373BA043 KN
LA
L
373BA044 KN
58


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  • My Stihl BR420/420C has after 15 years developed a gasoline leak. I fill tank with gasoline. Next day it’s empty. I removed tank, cleaned it up and inflated the tank with air compressor. Tank holds air without air leaks. Cleaned fuel lines. So no broken areas.
    Can someone advise me on where to look and what to replace? Submitted on 1-12-2021 at 02:11

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