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YZ 250 Idle spike

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I have an 03 YZ250 and after riding for a couple hours on the track, it idles like its going to blow up! I cleaned ther carb spotless and everything is set to factory specs. Correct fuel/gas mix, and im getting an even flow of fuel to the carb. I know that an air leak may be the problem (everything is tight up to the reeds), but wouldn't it idle high from cold start if that was the case?

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might not leak until it gets warm (gasket) spray carb cleaner around the left side crank seal air boot etc while running and see if it spikes

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