STIHL 029, 039 4
1.2 Fuel System 029 / 039
Carburetor: All position diaphragm
carburetor with integral fuel
pump
Standard setting
High speed adjusting screw H: Back off approx. 1 turn
Low speed adjusting screw L: Back off approx. 1 turn
(starting with screws tight
against their seats)
Carburetor leakage test
at gauge pressure: 0.4 bar (5.8 psi)
Fuel tank capacity: 0.56 L (1 .2 US pt)
Fuel mixture: Regular brand-name gasoline
and brand-name two-stroke
engine oil
Mix ratio: 50:1 with Stihl two-stroke
engine oil
25:1 with other brand-name
two-stroke brand-name,
air-cooled engine oils
Air filter: Prefilter (coarse filter)
bisectional box filter
1.3 Ignition System
Type: Electronic magneto ignition
(breakerless) with integral
trigger unit
Air gap: 0.15-0.3 mm (0.006-0.012 in)
Ignition timing: 2.0-2.8 mm (0.08-0.10 in) B.T.D.C.
at 8,000 r.p.m.
Advance angle: 24.5-29.5° 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 (0.020 in)
Spark plug thread: M14x1.25
Length of thread: 9.5 mm (0.37 in)
Heat range: 200
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