Ignition System - Husqvarna DT22 Operator's Manual

Ignition system

The engine is equipped with an electronic
ignition system. Only the spark plug requires
maintenance.
For recommended spark plug, see chapter
"Technical data".
IMPORTANT INFORMATION
Fitting the wrong spark plug type can
damage the engine.
1. Remove the ignition cable shoe and clean
around the spark plug.
2. Remove the spark plug with a 13/16" (21
mm) spark plug socket wrench.
3. Check the spark plug. Replace the spark
plug if the electrodes are burned or if the
insulation is cracked or damaged. Clean
the spark plug with a steel brush if it is to
be reused.
4. Measure the electrode gap with a gapping
tool. The gap should be 0.7–0.8 mm/
0.028–0.031". Adjust as necessary by
bending the side electrode.
5. Reinsert the spark plug, turning by hand to
avoid damaging the threads.
IMPORTANT INFORMATION
Inadequately tightened spark plugs can
cause overheating and damage the engine.
Tightening the spark plug too much can
damage the threads in the cylinder head.
5. After the spark plug is seated, tighten it
using a spark plug wrench so that the
washer is compressed. A used spark plug
should be turned 1/8–1/4 of a turn from the
seated position. A new spark plug should
be turned
1/2 a turn from the seated position.
6. Replace the ignition cable shoe.
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MAINTENANCE
8011-027
8011-054