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engine or tranny oil in air boot?

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Have a 09 crf450r and when we pull off the air filter the inside of the air boot is soaked with the oil we are putting in the engine and tranny ? ( we know its that oil cause its the lime green motul 300v in the boot) any one have an idea of what would cause this to happen?

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its from the overflow at the top of your valve cover its goes to your airboot mostly it happens when the bike is dropped and its over 90 degrees

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or when the crank seal is bad. Newer bikes or low hours you would be less likely to see this issue, and you would see a rise in the engine side oil and a drop in trans side oil level (oil migration)..

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