Transmission/Crankcase Oil Intermix

What seal must be replaced to keep the trans oil from leaking into the crankcase? 06' crf250r

Edited by dehotom

Right crank seal is usually the one that goes. Some folks are saying that the balance shaft seal is failing also causing the same issue, but I haven't seen one yet.

If you find low oil on one side and over serviced on the other side, check your Balance shaft seal.

We have had two bikes with this case.

Note the 2010 and newer bikes have added a "D" ring style seal on the balance shaft.

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