(57) A method and an apparatus for setting the timing of the ignition system (CDI) of
an internal combustion engine (M); after checking the timing of the ignition circuit
(CDI) with the engine (M) running at a predetermined speed, and determining the amount
of the correction to be performed for the advance, the engine (M) is stopped and the
active setting of the ignition (CDI) is modified on the basis of a coded correction
procedure stored in a setting unit (21) detachably connected between the voltage generator
(10, 12, 13) and the ignition system (CDI), by sending timing correction signals to
a control processor (PC) of the ignition system (CDI) via the same lines (RL1÷RL4)
which normally connect the timing pick-up (13) and the feed coil (12) of the voltage
generator, to the ignition circuit (CDI).
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