Operation Manual
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STIHL single cylinder two-stroke engine
Displacement: 61.5 cm
3
(3.75 cu.in)
Bore: 48 mm (1.89 in)
Stroke: 34 mm (1.34 in)
Idle speed: 2,500 r.p.m.
Maximum engine
speed
(cut-off speed): 13,500 rpm
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Type:
Electronic magneto ignition (breakerless)
Ignition timing:
1.9 - 2.5 mm (0.075 - 0.1 in) B.T.D.C.
at 8,000 r.p.m.
Spark plug (suppressed):
Bosch WSR 6 F or NGK BPMR 7 A;
Electrode gap 0.5 mm (0.02 in)
Spark plug thread M 14x1.25,
9.5 mm (0.37 in) long
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Carburetor:
All position diaphragm carburetor
with integral fuel pump
Air filter:
Prefilter and bisectional box filter
Fuel tank capacitiy:
0.625 l (1.32 US pt)
Fuel mixture: see chapter "Fuel"
Chain lubrication:
Fully automatic, speed-controlled
reciprocating oil pump.
Additional manual oil flow control
Oil tank capacity:
0.32 l (0.68 US pt)
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without bar and chain
5.7 kg (12.6 lb)
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Recommended cutting attachments
for compliance with § 5.12 of ANSI
Standard B 175.1-1991
(see page 11 of this Manual):
STIHL reduced kickback bar
(with green label):
for 0.325" and 3/8" pitch:
Rollomatic with sprocket nose
40, 45 or 50 cm (16, 18 or 20 in)
STIHL low kickback chain*
(with green label):
8.25 mm (0.325") Rapid-Micro 2
(26 RM 2)
9.32 mm (3/8") Rapid-Micro 2
(33 RM 2, 36 RM 2)
Chain sprocket:
8-tooth for 0.325" pitch or
7-tooth for 3/8" pitch
Since new bar/chain combinations may
be developed after publication of this
Manual, ask your STIHL dealer for the
latest STIHL recommendations.
Other bars and chains available for this
powerhead are:
STIHL yellow-labeled bars:
for 0.325" and 3/8" pitch:
Rollomatic "S" with sprocket nose
40, 45, 50 cm (16, 18, 20 in)
60 cm (24 in) 3/8" pitch only
Duromatic with stellite tipped nose
40, 45, 50 cm (16, 18, 20 in)
60 cm (24 in) 3/8" pitch only
STIHL yellow -labeled chains:
for 0.325" pitch:
Rapid-Super (26 RS),
Rapid-Micro (26 RM)
for 3/8" pitch:
Rapid-Micro (33 RM, 36 RM),
Rapid-Super (33 RS, 36 RS, 33 RSL,
Rapid-Duro 33 RD).
In order to comply with the kickback
performance requirements of § 5.12
of ANSI Standard B 175.1-1991,
do not use replacement saw chain
unless it has been designated as
meeting the ANSI § 5.12 requirements
on this specific powerhead, or has
been designated as "low kickback"
saw chain* in accordance with the
ANSI B 175.1-1991 standard.
*See definition of "low kickback chain"
on page 15 of this Manual.