Electronic control unit (ECU)
Remove saddle and fuel tank (see Section E) to gain access to the electronic
control unit (1).
It is composed of a capacitor, a rectier circuit that handles input signals received
from the pick-up sensor, a circuit that controls ignition timing advance in accordance
with pick-up sensor inputs and a switching circuit for capacitor discharge.
Spark plug
The spark plug (1) is an "NGK" CR9EB spark plug. Check electrode gap "A"
(0.7 mm). A wider gap may cause difculties in starting the engine and overload
the coil. A gap that is too narrow may cause difculties when accelerating, when
idling or poor performance at low speed. Clean off any dirt around spark plug
base before removing the spark plug. It is good practice to closely inspect the
spark plug after removal, as any deposits on it and the colour of the insulator
provide useful indications on spark plug heat rating, carburetion, ignition and
the general condition of the engine. Before retting the spark plug, accurately
clean the insulator with a wire brush. Smear some graphite grease on spark plug
thread, do it fully home nger tight then tighten it to 10÷12 Nm torque. Loosen the
spark plug then tighten it again to 10÷12 Nm. Spark plugs which have cracked
insulators or corroded electrodes should be replaced.
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