My bike doing the same thing.. after I ride for bout 20 mins and shut it off .. I cant start it again until the next day Then we gone go from there lol
Same happened with my bike thought it was the carb because I changed the carb then it would start even when hot but turned out I had moved the harness wires whilst changing the carb so then I bought all new wire harness now bike works perfect again and starts first time hot or cold
Just have this problem on my bike it runs good for 10 mins riding than now it won’t start it has spark changed to a new plug has a new cdi and kick starter