Good news,
I got a battery optimizer to refresh mine and... the bike starts fine again !!!
In fact, It seems that the battery has a lack of power to start the motor (that is quite heavy to launch). So the 'tac tac' noise was just the starter turning without enough power to start engine.
I hope this was just the battery that was weak and not a problem with the charger ot the alternator.
Thanks for the advises !!!
See you on the road
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