Hey Toxic, got an invite to join sauga riders, I clicked on Ultra'a profile and saw your post about your bike stalling. My first bike was an 08 250, so i know what you're saying.
If you know all this already, sorry
Easiest fix is to increase the idle speed. On the left side of the bike there's a cable with a nob at the end of it. Twisting it will increase or decrease your idle speed. worst case you'll need to clean the carburetors. if you've never worked on anything mechanical, your should get a professional to help you.
If this is your first bike, please don't jet, cut, stick, or mount anything on it. It's a waste of $ and you want your bike to retain it's resale value, cuz i'm willing to bet you're looking to upgrade, and when you do you'll have all the FI HP you'll ever need.
Keep in mind Kawasaki has years of experience making motos, so they've made your bike to run rock solid the way it is for a long time, and a rock solid bike it is
Anyway, Take care and ride safe please