Oil in crankcase....

Ok, I have tranny oil in my crankcase. My bike is a 89 rmx250. I just fixed it, broke it in yesterday. After break-in, I changed the oil, and I let it all drain out, and put the specified 650ml in. Let it cool off for awhile, then take it for a spin. Runs fine, I ride around for a little while trying to finish the break-in. It runs great all day, I have no probs, starts 1st kick everytime.

But today is a different story. Will not start for anything today. 1st thing i do is check the plug.. Milky grey wet substance all over the plug. Not again... :( Last time it did this the oil blew thru the powervalves and i changed the plug and its fixed.. This time, the oil will not come out of the crankcase. Its sitting in the bottom and i can hear it sloshing around (100% positive it is NOT gas) and i went through 5 plugs, everytime i change it, it doesnt even backfire or anything and it comes out with the milky grey stuff. This is my oil, I have a waterleak and my tranny oil is the exact same look, taste and smell.

How do i get the oil out?? I would rather not pull the top end if possible, any suggestions?? and how did it get in there??

I have narrowed down the water leak to be the waterpump seal. So I will fix that, but that isnt going to get the bike started. :moon:

I would like to know, if my RH seal was bad, why wouldnt the oil all rush into the crank when I poured the oil in, instead of waiting a day and then going in overnight?? Because it ran all day when I changed it with NO oil and no problems. Also, an interesting thing, it never leaks oil into the cases unless I overfill the oil. If I dont put too much oil in, it runs fine and no oil gets in the crank. So I am guessing I overfilled the oil, but why would that cause oil to get into the crank? Is it possible there is a vent somewhere that is blocked causing pressure to build and push the oil into the crank??