Hi China Moto bikers

The bike I have is a replica of the DF250RTR Bobber; as in my profile pic; 165FMM engine tied to an oil cooler..
Something that I am not entirely sure as to why this happens; when the bike is cold, electric and kick starter both gets her to life. But, as soon as she is warm? no way, that kick starter achieves nothing, cannot get her to start..

I don`t use the choke at all and I try and use the kick starter as much as possible to save on the electric starter... and obviously the old man is doing some exercises as well...

I`m thinking carburetter maybe ?

I would ppreciate any ideas, thx