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Friend needs help with his 450

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My friend asked me to post this- 2009 crf450r having major problems. Need help before i get seriously hurt from this dam bike. Basically after riding bike hard for 15 to 20 minutes on a mx track, bike will completely bog out just past quarter throttle and will not stop. Once i have let the bike cool down completely it will run fine again. But then goes right back to bogging after 15 minutes. Any thoughts on this please let me know. Thanks, j.t.

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The issue sounds heat related. (at 15 minutes it shits and after cooling its ok)

Id look at the ECT and the IAT sensors. One of those is bad.

Is the pipe sooty and black when you come back in? Like it went full rich?

If it is, one of those sensors is bad, and when it gets warmed up for a bit, the sensor fails and tells the ECU the bike is cold again and it goes full rich

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BTW if you know someone with an FI 250 or 450 ask them to borrow their tank to troubleshoot your problem.

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