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09 crf 450 vent tube

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i have 2 09 crf 450`s there is a tube that comes off the back side of the valve cover and runs down under the motor. after reading online this tub is suppose to Y into the air box and down to a plug. both of the bikes are not set up like this. on one bike its run to the front side of the motor and the other is run down the back side next to the rear shock. after riding the bike with the vent tube running near the rear shock i`ve notice when i rev the bike a puff of smoke comes out of this tube an not on the other bike. Both bikes run great, im just concerned if the smoke is an issue or if these tubes are not connected to the air box would cause problems in the future.

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