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Stihl SR420 Manual

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37SR 340, SR 420
English / USA
EPA / CEPA:
The Emission Compliance Period
referred to on the Emissions
Compliance Label indicates the number
of operating hours for which the engine
has been shown to meet Federal
emission requirements.
Category: A = 300 hours,
B = 125 hours, C = 50 hours
CARB:
The Emission Compliance Period used
on the CARB-Air Index Label indicates
the terms:
Extended = 300 hours, Intermediate =
125 hours, Moderate = 50 hours
Fuel System
Weight
SR 340
SR 420
Ignition System
Spraying Attachment
Blower Data
Carburetor: All position
diaphragm
carburetor with
integral fuel
pump
Fuel tank capacity: 50 fl.oz. (1.5 l)
Fuel mix: see chapter on
“Fuel”
Dry
SR 340: 24.5 lbs (11.1 kg)
SR 420: 24.5 lbs (11.1 kg)
Specifications
Single cylinder two-stroke engine
Displacement: 2.74 ci
(44.9 cm
3
)
Bore: 1.61 in (41 mm)
Stroke: 1.34 in (34 mm)
Idle speed: 3,100 rpm
Single cylinder two-stroke engine
Displacement: 3.45 ci
(56.5 cm
3
)
Bore: 1.81 in (46 mm)
Stroke: 1.34 in (34 mm)
Idle speed: 3,100 rpm
Type: Electronic
magneto ignition
Spark plug
(resistor type): Bosch WSR 6 F
or
NGK BPMR 7 A;
Electrode gap: 0.02 in (0.5 mm)
Container capacity: 3.4 gal (13 l)
Size of filler strainer
mesh: 0.04 in (1 mm)
Discharge rate
SR 340:
SR 420:
0.03-0.7 gpm
(0.13-2.78 l/min)
0.04-0.8 gpm
(0.14-3.03 l/min)
(infinitely
variable)
Quantity left in
container: 0.026 gal
(0.1 l)
(design related)
Air velocity
SR 340: 210 mph
(94 m/s)
SR 420: 226 mph
(101 m/s)
Maximum air flow rate without blowing
attachment
SR 340: 689 cfm
(1170 m
3
/h)
SR 420: 742 cfm
(1260 m
3
/h)
Air flow rate with nozzle
SR 340: 418 cfm
(710 m
3
/h)
SR 420: 441 cfm
(750 m
3
/h)
… 38 …


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