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STIHL 029, 039
3
1.
SPECIFICATIONS
1.1
Engine
029 039
STIHL single-cylinder two-stroke engine with special
impregnated cylinder bore
Displacement:
54.1 cm
3
(3.3 cu.in)
64.1 cm
3
(3.9 cu. in)
Bore:
45 mm (1.77 in)
49 mm (1.93 in)
Stroke:
34 mm (1.34 in)
34 mm (1.34 in)
Compression ratio:
9.5:1
10:1
Power output:
2.70 kW (3.7 bhp)
3.20 kW (4.4 bhp)
Max. torque:
2.8 Nm (2.1 lb. ft)
3.4 Nm (2.5 Ib. ft)
at 6,500 r.p.m.
at 6,500 r.p.m.
Max. permissible engine
speed with bar and chain:
13,000 r.p.m.
13,000 r.p.m.
Mean idle speed:
2,700 r.p.m.
2,700 r.p.m.
Crankshaft:
Three-part,
Three-part,
drop forged
drop forged
Crankshaft bearings:
2 ball bearings
2 ball bearings
Crankpin dia.:
14.4 mm (0.55 in)
14.4 mm (0.55 in)
Big-end bearing:
Needle cage
Needle cage
Conrod length:
58 mm (2.28 in)
58 mm (2.28 in)
Piston pin diameter:
10 mm (0.39 in)
10 mm (0.39 in)
Small-end bearing:
Needle cage
Needle cage
Rewind starter:
Pawl system with
Pawl system with
automatic rope
automatic rope
rewind mechanism
rewind mechanism
Starter rope:
3.5 mm (0.14 in) dia.,
3.5 mm (0.14 in) dia.,
960 mm (37.8 in) long
960 mm (37.8 in) long
Clutch:
Centrifugal clutch
Centrifugal clutch
without linings,
without linings,
76 mm (3.0 in) dia.
76 mm (3.0 in) dia.
Clutch engages at:
approx. 3,500 r.p.m.
approx. 3,500 r.p.m.
Crankcage leakage test
at gauge pressure:
0.4 bar (5.8 psi)
0.4 bar (5.8 psi)
under vacuum:
0.4 bar (5.8 psi)
0.4 bar (5.8 psi)