26
English
BR 500, BR 550, BR 600
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"
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.
