450F 2025 kx450 won’t start

So I bought a 2025 kx450 and it has maybe 3 hours on it, took it out a few days ago and rode all day with no problems, hit a hill climb and halfway up it just died almost like I hit the kill switch, and now it won’t start. Plug was fouled, put a new plug in and tried the flood clear procedure, still won’t start. Any ideas?
 
So I bought a 2025 kx450 and it has maybe 3 hours on it, took it out a few days ago and rode all day with no problems, hit a hill climb and halfway up it just died almost like I hit the kill switch, and now it won’t start. Plug was fouled, put a new plug in and tried the flood clear procedure, still won’t start. Any ideas?
Did an oil change on it the morning before riding, don’t know if that has anything to do with it
 
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