02 250f start ??????

my buddy has a 2002 yzf250 that he just bought used off of a local dealer. The bike has a full rebuild and other mods. My question is that the bike starts first kick cold, but wont start warmed up. The bike was only raced twice and has like 2 hours on the new motor. What could be the problem??

the gass is mabey old clean it out at the carb

Did you use the hot start?

Best thing I can tell you is if you used the hot start? At least for my bike it seems to start easier warm than cold.

I cleaned the carb, still didnt start. I am using the hot start button and it wouldnt start. Turns out it just needed a new boot that goes over the spark plug. Now it starts first kick cold and hot. thx

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