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•
If the petrol engine has just been running, wait until it has cooled down before servicing the
spark plug.
•
To ensure normal operation of the petrol engine, the spark-plug gap must be set correctly and
there must be no deposits.
1.
Remove the spark-plug cap and remove the dirt from around the spark plug.
2. Remove the spark plug using a special 21-mm socket spanner.
3. Check the spark plug and replace it if it is damaged or heavily clogged, the seal is aged, or
the electrodes are excessively worn.
4. Measure the electrode gap with a feeler gauge. If necessary, bend the side electrode to
adjust the distance.
5. The spark-plug gap is 0.7–0.8 mm.
6. Install the spark plug carefully to avoid thread misalignment.
7. After installing the spark plug, tighten the spark plug with the seal using a 21-mm spark-plug
socket spanner.
Important!
•
When installing a new spark plug, tighten the seal by half a turn more.
•
When installing a used spark plug, tighten the seal by an eighth to a quarter of a turn more.
Troubleshooting
Low motor power
Problem
Engine power is insuffi-
cient,
engine
speed
drops, or engine even
stops
© by WilTec Wildanger Technik GmbH
http://www.wiltec.de
№
Name
1
Spark-plug connector
2
Spark plug
3
Side electrode
Possible cause
Ignition system
Incorrect ignition timing
Fuel supply system
Air mixture in the oil circuit Release air.
Incorrect setting of main
nozzle
Needle valve or main noz-
zle clogged
Fuel tap blocked
Too many carbon depos-
its in combustion chamber
Item 92670
Proposed solution
Replace ignition coil.
Set new.
Clean and blow out.
Clean or replace.
Clean out.
Page 12
11 2023-1
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