Husqvarna fc 250 2014

Hello, I need help. I have husqvarna fc 250 2014 dirt bike. I change a lot parts (voltage regulator, battery, spark plug, starter relay..) All parts are brand new and original from husqvarna. Bike is running perfect when I ride it and it's all normal but it won't start when is hot. Valves and everything about engine is good (piston, rod, timing chain...)

I start up bike with charger and it's all good. I don't have a idea what's wrong.

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