YZ 250 Idle spike

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?

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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