Using/Losing Water

Just picked up a 426 and it seems to be pushing out water on the over flow on the radiator while riding or idling.

Does anybody know what could cause this?

Motor has just been recently rebuilt and I had to throw on new rings due to it overheating a month ago.

Needs a new rad cap.

Do you notice any smoking or antifreeze smell from the exhaust? Remove the rad cap and kick the bike over (you can start it but don't need to) if you see bubbles its a head gasket or cracked cylinder, most likely the first one though.

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