8
Technical data
RBC420, RBC420E, RBC421
Model
RBC420
RBC420E
RBC421
U handle
E handle
J handle
Dimensions: length x width x height
(without cutting blade)
mm
1,770 x 570 x 390
1,770 x 570 x 410
1,770 x 340 x 310
Mass
(without plastic guard and cutting blade)
kg
7.3
7.8
7.2
Volume (fuel tank)
cm
3
960
Engine displacement
cm
3
40.2
Maximum engine performance
kw
1.40
Engine speed at recommended max. spindle speed
rpm
8,500
Maximum spindle speed (corresponding)
rpm
7,000
Fuel consumption
kg/h
0.89
Specific fuel consumption
g/kWh
635
Idling speed
rpm
2,600
Clutch engagement speed
rpm
3,600
Carburetor (Diaphragm-carburetor)
type
WALBRO WYJ
Ignition system
type
Solid state ignition
Spark plug
type
NGK BPMR7A
Electrode gap
mm
0.6 – 0.7
Vibration per
ISO 22867
Right handle
(Rear grip)
a
hv eq
m/s
2
4.9
3.0
4.8
Uncertainty K
m/s
2
0.4
0.8
0.4
Left handle
(Front grip)
a
hv eq
m/s
2
4.7
4.2
5.4
Uncertainty K
m/s
2
0.6
0.8
0.6
Sound pressure level average to
ISO 22868
L
PA eq
dBA
90.9
90.9
97.5
Uncertainty K
dBA
2.2
2.2
2.6
Sound power level average to
ISO 22868
L
WA eq
dBA
103.9
103.9
110.3
Uncertainty K
dBA
2.8
2.8
1.8
Mixture ratio (Fuel:
MAKITA
2-stroke oil)
25:1
Gear ratio
14/17
Summary of Contents for RBC420
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