Owner's Manual

BR 500, BR 550, BR 600
English
22
Exhaust emissions are controlled by the
design of the fundamental engine
parameters and components (e.g.
carburation, ignition, timing and valve or
port timing) without the addition of any
major hardware.
Machines without adjustable
carburetor
On certain machine versions it is no
longer necessary to adjust the
carburetor. Such machines have no
setting symbol on the shroud.
These machines have been set at the
factory to provide an optimum fuel-air
mixture in all locations and operating
conditions.
Adjusting idle speed
Engine stops while idling:
N Turn the idle speed screw (LA)
slowly clockwise until the engine
runs smoothly.
Machines with adjustable carburetor
The carburetor comes from the factory
with a standard setting.
This setting provides an optimum fuel-air
mixture under most operating
conditions.
With this carburetor it is only possible to
adjust the high speed and low speed
screws within fine limits.
Standard Setting
N Shutting down the engine
N Check the air filter and replace it if
necessary.
N Check that the throttle cable is
properly adjusted – readjust if
necessary – see chapter on
"Adjusting the Throttle Cable".
N Check the spark arresting screen
(country-specific) in the muffler and
clean or replace if necessary.
N Carefully turn both adjusting screws
counterclockwise as far as stop:
N The high speed screw (H) is 3/4 turn
open.
N The low speed screw (H) is 3/4 turn
open.
N Start and warm up the engine.
Engine Management Adjusting the Carburetor
452BA105 KN
H
L
H
L