84
144
143
WARNING
If the engine has been running, the silencer will be very hot. Take care not to get burnt.
2 Inspect the spark plug to check that it is not worn and that the insulator is not chipped or damaged.
If this is the case, the spark plug must be replaced. Finally clean the spark plug with a steel brush.
3
Measure the distance between the spark plug
electrodes using a thickness gauge, and
correct it if necessary by bending the upper
electrode.
The distance must be (Fig. 143): 0.70 -
0.80 mm.
4 Check that the spark plug washer is in good condition. Screw in the spark plug by hand to avoid
damaging the thread.
5
Once the spark plug rests on the base, tighten
it with a key for spark plugs so that it squeezes
the washer (Fig. 144).
NOTE:
When a new spark plug is fitted, tighten it by 1/2 a turn once it has been positioned so that it squeezes
the washer. When a used spark plug is fitted again, tighten it by 1/8 – 1/4 of a turn until it has been
positioned so that it squeezes the washer
WARNING
The spark plug must always be tightly secured. If the spark plug is not tightened sufficiently, it may
overheat and damage the engine.
Maintenance
Содержание MCH 13/DH
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