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XRrider62

oil coming from vent hose on top of head

5 posts in this topic

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.

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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.

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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.

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