As well as drying out the spark plug as OG mentioned, a lot of bikes have a starting characteristic. I don't mean all xxx250's have to be started a particular way but each bike seems to know what it likes to start up easily. Being fuel injected, it means that a choke position is not a consideration. When you start it do you turn the throttle during or before pushing the starter button? I would turn the bike on and push the starter, no throttle at all. if that doesnt work move to a small amount of throttle held in one position, not twisting and I mean small; then I would try full throttle and push the button. The bike should start and idle with no throttle at all to start with but the plug(s) may need a clean first.