Ignition Timing; Rewind Starter; Maintenance; Rope Rotor, Pawls - Stihl 034 Series User Manual

6.5.2

Ignition Timing

Ignition timing on electronic
(breakerless) magneto ignition
systems is fixed at 2.5 mm B.T.D.C.
at 8,000 rpm and is not adjustable.
However, in view of the permissible
tolerances in the electronic circuitry,
it may vary between 1.8 and 2.6 mm
B.T.D.C. at 8,000 rpm.
Since there is no mechanical wear
in these systems, ignition timing
cannot get out of adjustment.
However, an internal fault in the
circuit can alter the switching point
in such a way that a spark test will
still show the system to be in order
although timing is outside the
permissible tolerance. This will
impair engine starting and running
behavior.
40
7

Rewind Starter

7.1 Routine

Maintenance

Troubleshooting chart - see
"Standard Repairs, Trouble-
shooting" handbook.
If the action of the starter rope
becomes very stiff and the rope
rewinds very slowly or not com-
pletely, it can be assumed that the
starter mechanism is in order but
plugged with dirt. At very low
outside temperatures the lubri-
cating oil on the rewind spring may
thicken and cause the spring
windings to stick together. This has
a detrimental effect on the function
of the starter mechanism. In such a
case it is sufficient to apply a few
drops of paraffin (kerosine) to the

rewind spring.

Then carefully pull out the starter
rope several times and allow it to
rewind until its normal smooth
action is restored.
If clogged with dirt or pitch, the
entire starter mechanism, including
the rewind spring, must be removed
and disassembled. Take special
care when removing the spring.
Wash all parts in paraffin/kerosine
or white spirit.
Lubricate the rewind spring and
starter post with STIHL special
lubricant, see 13.2, before installing.
7.2

Rope Rotor, Pawls,

Starter Rope,

Rope Guide Bush

– Remove the fan housing -
6.4.1
Note:
For descriptions on removing and
installing the rope rotor, replacing
the starter rope, pawls or rope guide
bush - see "Standard Repairs,
Troubleshooting" handbook.
Observe tightening torques when
refitting the fan housing (see
"Tightening Torques").
034, 036, 036 QS
see