Coolant Mixing with Oil on a 99' CR125?

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.

Water pump seal

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

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:

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.

On a 4 stroke that could be the culprit, but here its not the case.
Could you explain to me why that is? Just for knowledge. Also, do you have to pull the clutch cover off to change the Water Pump Seal?

Get a manual. You will save yourself alot of work and money on seals.

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