oil coming from vent hose on top of head

Just wondering if someone familiar with 01 YZ426 could tell me what could be happening. When I run my yz, oil comes out of the vent hose that attaches to the top of the head. I don't have oil in the water or vise-versa. thanks for any suggestions. It's not alot of oil but it is a nuisance.

Small amounts are normal, like a few drops after a hard ride. How much is there?

Small amounts are normal, like a few drops after a hard ride. How much is there?

Well, there's enough to make a mess on the frame. And it was'nt ridden hard at all.

When it gets to be an excess, it's usually one of two things. One is a gross overfill. This is a little harder to do accidentally with a 426 than a 450 because of where the filler is, but if you go beyond about 2qts total, it will start barfing some.

The other isn't that simple; tired rings. Too much blow by will increase the amount of outflow from the breather. New rings are the only fix. Check another one and be sure it's really excessive.

Mine pukes when overfilled with oil. I don't think it hurts anything.

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