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starting problem

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my son has a 2001 yz25of. he took it out fotnthe first time and it was running great, but a bout a half hour into riding, my son stopped and shut it off. a couple minutes later he went to start it, kicked a couple times, i told him to use the hot start, it started and revved up for about a secong and then shut down and has not started since. i have checked spark and it has spark, i have rebuilt the carb but still it does not start. it does have a backfire every now and then when i kick it over. i am thinking cdi went out? any suggestions would be appreciated.

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Umm.... how long have you had the bike??? My cousins bike did a similar thing and 3 of the 5 valves ended up being burnt because the previous owner used the bike as a RACE bike and only adjusted the valves ONCE in the 4 years he owned it.

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Check the valves for proper clearances, I would start there, good luck

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