STIHL 009, 010, 011 25
4.4.2 Ignition Lead
Checking electrode gap Resetting electrode gap with Bosch
with feeler gauge spark plug gauge Pulling out leg spring
Never use a steel wire brush for by pulling the rewind starter. The ignition lead feeds the high-
cleaning a sooted or carbonized spark tension pulse generated in the arma-
plug. Always use a brass wire brush If there is no sparkover although the ture to the spark plug. If its insulation
for this purpose and then blow out the spark plug is in good condition, first is brittle or damaged in any way a
plug with compressed air. If the spark check the lead connections. Chafed sparkover to ground can occur and
plug is smeared with oil, wash the insulation on the ignition or ground thus interrupt the ignition process.
insulator nose with a grease solvent leads will cause a short-circuit to
and blow out with compressed air. ground. If this is the case the engine The ignition lead must be renewed in
will either not start or only run errati- such a case.
As the electrode gap becomes wider cally.
as a result of normal erosion the gap To remove the ignition lead, dis-
must be checked with a feeler gauge assemble the flywheel (4.4.4) and
at regular intervals and reset as Before refitting the spark plug in the ignition armature (4.4.5.3). Unscrew
necessary. The specified gap is cylinder, clean the spark plug seat and the ignition lead from the wood screw
0.5 mm and can be restored by make sure the sealing ring is in good on the high-tension output of the
bending the ground electrode. How- condition. Tighten down the spark armature. Take off the rubber boot and
ever, always fit a new spark plug if the plug to a torque of 25 Nm (2.5 kpm). then pull out the ignition lead through
electrodes are badly eroded. the cable clamp and crankcase. Use a
suitable pair of pliers to grip and pull
Accurate checking of the spark plug the leg spring out of the ignition lead
is possible only with a special spark terminal. Then pull ignition lead out of
plug tester. A provisional check can the terminal.
be carried out by fitting the clean
spark plug in the ignition lead terminal
and holding it against ground. There
should be a powerful sparkover at the
electrodes when the engine is cranked
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