Stihl BR 450 User Manual

BR 450, BR 450 C
English
22
N Remove the filter element (3).
N Replace dirty or damaged filters.
N Fit the new filter in the filter housing.
N Fit the filter cover.
N Fit the screws and tighten them
down firmly.
General Information
The carburetor comes from the factory
with a standard setting.
This setting provides an optimum fuel-air
mixture under most operating
conditions.
Preparations
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.
Standard Setting
N Turn high speed screw (H)
counterclockwise as far as stop (no
more than 3/4 turn).
N Turn the low speed screw (L)
clockwise as far as stop, then turn it
back 3/4 turn.
Adjusting Idle Speed
N Carry out the 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.
0002BA089 KN
3
Adjusting the Carburetor
0002BA082 KN
H
L
0002BA083 KN
LA
L
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Stihl BR 450 Specifications

General

Type	Backpack blower
Airflow	1430 m³/h
Airspeed	298.8 km/h
Suction mode	-
Shoulder strap	Yes
Power source	Gasoline
Sound power level	108 dB
Vibration emission	2.5 m/s²
Sound pressure level	102 dB

Weight and Dimensions

Weight	10600 g