Instruction Manual

BR 500, BR 550, BR 600
English
18
Exhaust emissions are controlled by the
design of the engine and components
(e.g. carburation, ignition, timing and
valve or port timing).
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 Shut off the engine.
N Check the air filter and clean or
replace 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
(not in all models, 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 (L) is 3/4 turn
open.
Adjusting Idle Speed
N Carry out standard setting.
N Start and warm up the engine.
Engine stops while idling
N Turn the idle speed screw (LA)
slowly clockwise until the engine
runs smoothly.
Engine Management Adjusting the Carburetor
452BA105 KN
H
L
H
L