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Coolant Mixing with Oil on a 99' CR125?

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I just picked up a 1999 CR125, but the coolant was mixing with the oil. What are all of the problems that could cause this? I am hoping it is just the impeller seal but need to know what other problems this could be. I already pressurized the cooling system and didn't notice anything leaking, but there was no air pressure behind the impeller seal so I couldn't tell if that was bad or not. Any help would be greatly appreciated. Thanks.

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Water pump seal

+ 1. Pump seals are stuffed. Recondition the pump seals.

Thats the most likely problem. Shouldn't be anything else i don't think. :confused:

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Would a cracked cylinder or head be causing this also? Just a thought.

On a 4 stroke that could be the culprit, but here its not the case.

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