Cleaning The Spark Plug - GEISMAR MP.12 Manual

5.1.8 – Cleaning the spark plug
Recommended spark plugs: BPR6ES (NGK); W20EPR-U (Denso)
The recommended spark plug has the correct thermal index for
normal engine operating temperatures.
A defective spark plug can cause engine damage.
If the engine has just run, let it cool down before working on the spark
plug.
To ensure good performances, the spark plug must have correct
electrode spacing and not be soiled.
- Disconnect the spark plug hood and clean around the spark plug to
prevent dirt from entering the combustion chamber
- Unscrew the spark plug with the spark plug
wrench supplied
- Visually inspect the spark plug.
- Replace it if it is damaged or extremely
soiled, if its sealing washer is in poor
condition or if its electrode is worn.
- Measure electrode spacing with a wire
thickness gauge.
* If necessary, correct it by bending
the side electrode.
* Electrode spacing must be between
0.7 and 0.8 mm.
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- Put back the spark plug manually, taking care not to damage its
- Once the spark plug has touched its centre, continue to tighten it using
- Fasten the spark plug hood to the spark plug
Electrode
Spacing
Sealing washer
threading
a spark plug wrench to compress the sealing washer
* If the spark plug is new, tighten it by 1/2 turn after it has touched
its centre in order to compress the washer.
* If it has already been used, tighten it by 1/8 to 1/4 of a turn after
it has touched its centre in order to compress the washer.
An insufficiently tightened spark plug could overheat and
damage the engine.
An excessively tightened spark plug could damage the
threading in the cylinder head.
Réf. : 450100 FR