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9.3 Spark plug maintenance
Recommended spark plugs: TORCH F6RTC, NGK BP7ES, BOSCH WR3C.
1. Remove the cap of spark plug (B), pulling it out.
2. With a spark plug wrench (A) unscrew and remove the spark plug from the
engine (turn it counter clockwise).
3. Visually check the spark plug. If the spark
plug insulation is cracked or chipped, replace it
with a new one. To clean dirt on the electrode,
use a very thin wire brush.
4. Check the electrode distance with a calliper.
The distance should be between 0.6 and
0.8mm. If it does not match, adjust it carefully.
5. Carefully put back the spark plug, starting its
threading manually to avoid the damage of the
thread. With the spark plug fully threaded
make a final tightening with a spark plug
wrench, according to the following
recommendations:
• New spark plugs: 1/2 turn
• Used spark plugs: 1/8 to 1/ 4 turn
6. Put back the cap of the spark plug.
NOTE: The spark plug must be firmly tightened. An incorrectly fitted spark
plug can heat up and even damage the engine. On the other hand, over-tightening
can damage the spark plug and damage the thread of the cylinder head.
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