Main Parts; Specifications - Stihl SR 420 Instruction Manual

21 Main Parts

– Rewind starter
– Spark plug
– Damping elements of anti-vibration system
21 Main Parts
3
1
6
5
2
4
15
15
16
1 Baffle screen
2 Standard nozzle
3 Metering knob
4 Extension tube
5 Throttle trigger
6 Setting lever
7 Stop switch
8 Control handle
9 Stop cock
10 Pleated hose
11 Harness
12 Backplate
13 Back padding
14 Air filter
15 Antivibration elements
16 Strap hook
17 Container cap
18 Container
19 Spark plug boot
20 Carburetor adjusting screws
21 Choke knob
0458-372-0121-C
7
8
11
9
14
12
10
13
17
18
19
25
20 #
21
23
22
24
22 Fuel filler cap
23 Starter grip
24 Fuel tank
25 Muffler
# Serial number

22 Specifications

22.1 Engine
Single cylinder two-stroke engine
Displacement:
Bore:
Stroke:
Engine power to ISO 7293: 2.6 kW (3.5 bhp)
Idle speed:
Engine/blower speed dur‐
ing operation:
22.2 Ignition System
Electronic magneto ignition
Spark plug (resistor type): Bosch WSR 6 F,
Electrode gap:
22.3 Fuel System
All position diaphragm carburetor with integral
fuel pump
Fuel tank capacity:
22.4 Blowing Performance
Air velocity:
Max. air flow rate without
blower tube
Air flow rate with nozzle:
22.5 Spraying Attachment
Tank volume:
Quantity left in container:
Mesh size of filler strainer: 1 mm
Discharge rate (without
pressure pump, infinitely
variable):
Spraying distance, horizon‐
tal:
22.6 Weight
Dry:
Max. operating weight
(fueled and filled)
22.7 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.
English
56.5 cc
46 mm
34 mm
3,100 rpm
7,500 rpm
NGK BPMR 7 A
0.5 mm
1500 cc (1.5 l)
101 m/s
3
1260 m /h
3
750 m /h
13 l
0.1 l
0.257 – 3.844 l/min
12 m
11.1 kg
25.2 kg
23