Fantic Motor 125 Series, Owner'S Manual

Page: 77 / 130

77
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The spark plug is a very important part for good
engine efficiency and special care must be given
to it.
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The engine must be cold for this operation.
- Remove the spark plug cap (1).
- Release the spark plug (2) using the relative
wrench and then unscrewing by hand until it
can be fully removed.
- Clean it with a metal brush and check that
the distance between the electrodes is
0.7-0.8 mm .
This should be done approx. once every
4000 km, while the plug must be changed
once every 8000 km.
- Refit the spark plug, inserting it first by
hand and only using the wrench for the
final tightening.
- Replace the spark plug cover tube (1), ensur-
ing that it has been inserted correctly.
Whenever the spark plug is changed, check the
pitch and the reach of the thread. If the threaded
part is too short, carbon deposits will build up
on the thread seat thereby risking damaging the
engine when the correct spark plug is refitted.
Only use spark plugs of the recommended type,
see page 81 (SPECIFICATIONS), otherwise en-
gine performance and life could be adversely
a ff ected.
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For the maintenance intervals, see page 61 (PE-
RIODIC MAINTENANCE CHARTS), under:
- Throttle control.
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The no-load travel (A) of the accelerator handle
must be 2-3 mm, measured on the rim of the
actual twist grip handle.
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- Place the vehicle on the stand.
- Remove the protective sleeve.
- Loosen the ring nut (2).
- Turn the adjusting device (3) to reset the rec-
ommended value.
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- Manually lock rotation of the adjusting de-
vice (3) and tighten the ring nut (2).
- Check the no-load stroke (A).
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- Replace the protective sleeve.