M.24 Part. N. 8000 H1344 (10-2009)
ELECTRIC SYSTEM, DIGITAL INSTRUMENT
Spark plug
Use "NGK" CR8EB spark plug (1). Check distance "A" (0.7 mm / 0.027 in.)
between electrodes. A wider gap may cause difculties in starting engine and in
overloading coil.A gap that is too narrow may cause difculties when accelerating,
when idling the engine or when performing at low speeds. Clean the dirt away
from the base of the spark plug before removing it from the cylinder. It is very
useful to examine the state of the spark plug just after it has been removed from
the engine since che deposits on the plug and the colour of the insulator provide
useful indications concerning the heat rating of the plug, carburation, ignition and
general engine condition. Before retting the plug, thoroughly clean the insula-
tor using a brass-metal brush. Apply a little graphite grease to the spark plug
thread; t and screw the spark plug by hand then tighten to the torque of 10÷12
Nm- 7.4÷8.9 ft/lb. Loosen the spark plug then tighten it again to the torque of
10÷12 Nm- 7.4÷8.9 ft/lb. Spark plugs which have cracked insulators or corroded
electrodes should be replaced.
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