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Coolant leak from crankcase weep hole

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My 08 YZ250 is leaking coolant from the weep hole at the case split. I've read that the fix requires splitting the cases to replace the coolant passage o-ring...a $6 part. Can anyone verify this diagnosis?

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Yep. I'm familiar with the water pump shaft seal leaking from the water pump weep. This is a machined weep rite at the case split.

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Be ready to order a water pump shaft.  The bare steel shaft gets water and mud IN the weep hole and, especially if the hole gets plugged with mud and you don't notice it.  (who looks at the weep hole after you ride !?!?),  it will rust the shaft and take out 1 or both seals.

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