Ignition Timing - Stihl 009 User Manual

STIHL 009, 010, 011
Top:
Cylindrical pin on contact set
Bottom:
Locating hole in crankcase
To adjust the breaker pointer gap,
turn the crankshaft in the engine's
normal direction of rotation
(counterclockwise) until the piston is
at T D.C. The flywheel cam opens the
contact breaker lever fully in this
position. Now slacken off the contact
set and turn it until a breaker point
gap of 0.4 mm is obtained with a
clean feeler gauge. Then retighten the
mounting screws. Check ignition
timing and magneto edge gap.
Checking breaker point gap
The breaker point gap, ignition timing
and magneto edge gap are
interrelated and none of these values
can be altered without affecting the
others. However, this also means that
if one of these values is correct the
other two should normally be correct
as well. The dominating factor is the
magneto edge gap. If variations are
experienced in practice, preference
should be given to maintaining the
correct edge gap.
Finish off by checking the lubricating
felt. It should be in good condition and
soaked with oil.
4.5

Ignition Timing

The ignition timing on the breaker-
controlled magneto ignition system
must be set to 2.0 mm before T D.C.
(top dead center). This means that
the moving contact should just begin
to lift off the fixed contact when the
crankshaft is in this position. The
contact breaker points are fully open
when the crankshaft is in the T.D.C.
position; the breaker point gap must
be 0.4 mm.
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