Stihl 029, 039 - 1. SPECIFICATIONS; 1.1 Engine

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)