English / USA

Specifications

Engine

EPA:

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

STIHL single cylinder two-stroke engine

Displacement:

4.31 cu.in

 

(70.7 cm3)

Bore:

1.97 in

 

(50 mm)

Stroke:

1.42 in

 

(36 mm)

Idle speed:

2,500 rpm

Ignition System

Type:

Electronic

 

magneto ignition

Spark plug

Bosch WSR 6 F,

(suppressed):

NGK BPMR 7 A,

 

Champion RCJ 6 Y

Electrode gap:

0.02 in (0.5 mm)

Fuel/Oil System

Carburetor:

All position

 

diaphragm

 

carburetor with

 

integral fuel pump

Air filter:

Synthetic fabric

Fuel tank capacity:

1.69 US pt (0.8 l )

Fuel mix:

See “Fuel”

Chain lubrication:

Fully automatic oil

 

pump

Oil tank capacity:

0.68 US pt (0.325 l)

Weight

 

without bar and

 

chain:

13 lb (5.9 kg)

Cutting Attachment

Recommended cutting attachments for compliance with § 5.11 of ANSI Standard B 175.1-2000

(see page 14 of this Manual):

STIHL reduced kickback bar (with green label) for 3/8" pitch: Rollomatic with sprocket nose 16, 18 or 20 in (40, 45 or 50 cm)

STIHL low kickback chain1) (with green label) for 3/8" pitch: 3/8" (9.32 mm) Rapid-Micro 2 (33 RM2, 36 RM2)

Chain sprocket:

7-tooth for 3/8" pitch spur sprocket

In order to comply with the kickback performance requirements of § 5.11 of ANSI Standard B 175.1-2000, do not use replacement saw chain unless it has been designated as meeting the ANSI § 5.11 requirements on this specific powerhead, or has been designated as "low kickback" saw chain1) in accordance with the ANSI B 175.1-2000 standard.

1)See definition of "low kickback chain" on page 16 of this Manual.

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MS 440, MS 440 W, MS 440 C