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Coolant in crankcase!!

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So, just finished rebuilding an older yz125. Filled up the oil and coolant, started her up, runs great. luckily for me, I didn't torque the clutch springs tight enough so I was forced to drain everything so I could get to the clutch. I cracked the coolant drain and nothing came out. I cracked the oil plug and this nice white shit came out... the coolant seal will be replaced, but since the oil/coolant is so thick, how could I efficiently and effectively flush?

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Best way is to use kerosene, but it's going to take quite a few times to get all that nasty stuff out. After that just change the oil more frequently the first couple times and it should be good. 

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Diesel works fine.  Most of it has enough additives to help it get the water out too.  Don't worry about rinsing a time or two and then putting some cheap motoroil in it and running it until it is warm ,  and repeating.   your oil may show some moisture for a few rides.   Also,  it is your TRANSMISSION case, not your CRANKCASE that ended up with the coolant in it. 

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