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Where is it leaking exactly? If it's from the weep hole, that's a tell tale that the water side seal has failed. If it's around the gasket, well, there's your answer.
It's all water under the bridge, and we do enter the next round-robin. Am I wrong?
Usually there is a hole in the water pump cover or crankcase cover that exposes a tiny passage that leads to a spot between the water and oil seals. If you get oil out of the hole, the oil side seal is failing. Coolant, the water side. It's a little tell tale to warn you there is a problem before it gets so bad it wrecks your engine.
How do I know if the shaft or impeller is shot, is it possible to see?
No skid plate, but only ride MX, doubt it took that much of a hit. And its an 04 according to the sticker on the frame.
However if you come across the COO and want to mail it to me, that would be awesome.
Check run out on the shaft and broken fins or other deterioration of the impeller.
After going through some nonsense with my Polaris, my advice is to spend the money, eliminate the hassle and replace all mentioned items...gaskets, seals and all parts associated with coolant circulation.