[solved]
My problem has been finally solved...
First I changed the spark plug gap to 0.4 mm : the engine starts better but not really good...
Then my dealer tries to change the stator and rotor by a used one coming from a derbi 50cc with engine coil OK but lighting coil bad (which is of no importance for the MC65...) : and now I have good sparks and engine starts very well with the recommanded spark plug gap of 0.6 mm !
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