BR 450, BR 450 C
English
10
uses. See the "Maintenance, Repair and 
Storing" section of these Safety 
Precautions. Remember that the risk of 
a brush or forest fire is greater in hot or 
dry conditions.
WARNING
MAINTENANCE, REPAIR AND 
STORAGE
WARNING
Use only identical STIHL replacement 
parts for maintenance and repair. Use of 
non-STIHL parts may cause serious or 
fatal injury.
Strictly follow the maintenance and 
repair instructions in the appropriate 
section in this instruction manual. 
Please refer to the maintenance chart in 
this instruction manual.
WARNING
Always stop the engine and make sure 
that the fan is stopped before doing any 
maintenance or repair work or cleaning 
the power tool. Do not attempt any 
maintenance or repair work not 
described in this instruction manual. 
Have such work performed by your 
STIHL servicing dealer only.
Do not clean your machine with a 
pressure washer. The solid jet of water 
may damage parts of the machine.
WARNING
Use the specified spark plug and make 
sure it and the ignition lead are always 
clean and in good condition. Always 
press spark plug boot snugly onto spark 
plug terminal of the proper size. A loose 
connection between spark plug terminal 
and the ignition wire connector in the 
boot may create arcing that could ignite 
combustible fumes and cause a fire. 
Keep spark plug clean, and make sure 
ignition lead is in good condition. Do not 
use a spark plug with a detachable SAE 
adapter terminal. Arcing may occur that 
could ignite combustible fumes and 
cause a fire. This can result in serious 
injuries or damage to property.
WARNING
Never test the ignition system with the 
boot removed from the spark plug or 
with a removed spark plug, since 
uncontained sparking may cause a fire.
WARNING
Do not operate your power tool if the 
muffler is damaged, missing or modified. 
An improperly maintained muffler will 
increase the risk of fire and hearing loss. 
Your muffler is equipped with a spark-
arresting screen to reduce the risk of 
fire; never operate your power tool if the 
screen is missing, damaged or clogged. 
Remember that the risk of a brush or 
forest fire is greater in hot or dry 
weather.
In California, it is a violation of § 4442 or 
§ 4443 of the Public Resources Code to 
use or operate gasoline-powered tools 
on forest-covered, brush-covered or 
grass-covered land unless the engine’s 
exhaust system is equipped with a 
complying spark arrester that is 
maintained in effective working order. 
The owner/operator of this product is 
responsible for properly maintaining the 
spark arrester. Other states or 
governmental entities/agencies, such as 
the U.S. Forest Service, may have 
similar requirements. Contact your local 
fire agency or forest service for the laws 
or regulations relating to fire protection 
requirements.
Tighten all nuts, bolts and screws except 
the carburetor adjustment screws after 
each use.
Some STIHL power tools 
are equipped with a cata
-
lytic converter, which is 
designed to reduce the 
exhaust emissions of the 
engine by a chemical pro
-
cess in the muffler. Due 
to this process, the muf
-
fler does not cool down 
as rapidly as conven
-
tional mufflers when the 
engine returns to idle or 
is shut off. To reduce the 
risk of fire and burn inju
-
ries when using a 
catalytic converter, 
always set your power 
tool down in the upright 
position and never locate 
it where the muffler is 
near dry brush, grass, 
wood chips or other com
-
bustible materials while it 
is still hot.