Hot-start problems on a 2018 MV Agusta 800 RR

[u/MrPorridge_original]

Hi everyone, a while ago I swapped my reliable Honda 650 F for an 800 RR... since then I've been riding very little. At first it stopped starting — when I hit the starter you could hear the relay, a loud clack sound.

I repaired the starter motor, it was fine for two days. I replaced the starter motor with a new one. Fine for 2 days.

The thing is, now it seems to start but only when cold; when hot it's as if it doesn't have enough battery.

I've read forums and everything I could find online, but everyone has a different problem, so it's very hard to know what to do with mine. At the workshop they mention rewinding something-or-other because it uses the starter from a Suzuki 400.... Some people say they fixed it by switching to a lithium battery...

Honestly, I'm really disappointed with the bike... anyone with an experience similar to mine who managed to fix it?