Dullbut

I am first owner, but it's also my bike, didn't know there was a running procedure, I knew it needed breaking in and would need a oil change soon but other than that I had no idea, is there anything I need to know

I have a 2016 cpi suv125 it had 0 miles so was brand new, was riding fine but now I've hit 100 miles on it, it starts from cold and runs for a bit but then coughs and cuts out and won't start till it cools down, I've adjusted the idle and mixer but no joy, anyone got any ideas what is happening thanks