ZX6R 636 A no longer starts

Hello Kawa-Fans, after two years with my old ER-5 I have recently done a ZX6R 636 A Bj 02 (picture in the appendix 🙂 ), because the ER-5 is then somehow quite weak on the chest. The good piece stand though a few years, has only about 14,000 km down but had up to some smallnesses actually no problem. 2-3 weeks ago I then did Tüv again and until the penultimate weekend then everything was actually really great, until the little Ninja suddenly simply went out. The starter turns, but also with starter spray does not really work on – quite a little ignition but nothing significant. Nevertheless I had already checked some things, like e.g. petrol filter, petrol pump, fuses etc. – everything was no problem. Therefore now I suspect that there is a problem with the ignition. The starter relay, that somehow switched a lot suspiciously loudly, I have exchanged for a used one – but no improvement. What would of course remain to the ignition picture?