99 wr 400 oil from vent

how much oil if any is acceptable from vent tube out of motor---mine leaks a little after a long ride. is it time for a top end? my engine also seems to have a lot of mechanical noise from motor--can the chain get slack in it? this is my 1st 4stroke and i appreciate any replys shane :)

Sounds normal. Try doing a search for those topic's, it has been a popular topic. Good luck :)

That is totaly normal, it is just oil foam from the very top condensing in the vent tube, when you stop after a long ride it collects and drips down out of the tub.

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