16
.
Carburetor Adjusting Screws
For tuning the carburetor.
17
.
Manual Fuel Pump
Provides additional fuel feed for a cold start.
18
.
Choke Knob
Eases engine starting by enriching mixture.
19
.
Starter Grip
The grip of the pull starter, for starting the
engine.
20
.
Fuel Filler Cap
For closing the fuel tank.
21
.
Fuel Tank
For fuel and oil mixture.
22
.
Spark Plug Boot
Connects the spark plug with the ignition
lead.
23
.
Muffler (with Spark Arresting Screen)
Muffler reduces exhaust noises and diverts
exhaust gases away from operator.
Spark arresting screen is designed to reduce
the risk of fire.
24
.
Spacer
Designed to reduce the risk of burns and fire.
20 Specifications
20.1
Engine
Single-cylinder two-stroke engine
Displacement:
63.3cm
3
Cylinder bore:
48 mm
Piston stroke:
35 mm
Idle speed:
3000 rpm
Engine power to ISO 7293: 2.9 kW (3.9 bhp)
20.2
Ignition system
Electronic magneto ignition
Spark plug (suppressed): NGK BPMR 7 A,
BOSCH WSR 6 F
Electrode gap:
0.5 mm
20.3
Fuel system
All-position diaphragm carburetor with integral
fuel pump
Fuel tank capacity:
1700 cm
3
(1.7 l)
20.4
Blowing capacity
Blowing force:
28 N
Air velocity
83 m/s
Air throughput:
1090 m
3
/h
Maximum air speed:
99 m/s
Maximum air flow rate without
blower tube:
1430 m
3
/h
20.5
Weight
BR 450:
10.6 kg
BR 450 C:
11.5 kg
20.6
Sound and Vibration Levels
When determining sound and vibration levels,
idling and the nominal maximum engine speed
are taken into account in a ratio of 1:6.
For further details on compliance with Vibration
Directive 2002/44/EC, see
www.stihl.com/vib
20.7
Sound pressure level L
peq
in
accordance with DIN EN ISO
22868
BR 450:
102 dB(A
)
BR 450 C:
102 dB(A
)
20.8
Sound power level L
weq
in
accordance with DIN EN ISO
22868
BR 450:
108 dB(A
)
BR 450 C:
108 dB(A
)
20.9
Vibration measurement a
hv,eq
in
accordance with DIN EN
ISO 22867
20.9.1
Standard version
Handle,
right
BR 450:
2.5 m/s
2
BR 450 C:
2.5 m/s
2
20.9.2
Version with bike handle
Handle, left
Handle,
right
BR 450:
2.5 m/s
2
2.5 m/s
2
BR 450 C:
2.5 m/s
2
2.5 m/s
2
The K‑factor in accordance with Directive
2006/42/EC is 2.0 dB(A) for the sound pressure
level and sound power level; the K‑factor in
accordance with Directive 2006/42/EC is
2.0 m/s
2
for the vibration level.
20.10 REACH
REACH is an EC regulation and stands for the
Registration, Evaluation, Authorization and
Restriction of Chemical substances.
English
20 Specifications
20
0458-391-8321-B
