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1983 Honda vt750 Shadow
20,541 Posts
If the radiator cap rubber seals are not sealing perfectly for the return system, the coolant can be pushed into the overflow like they should but not be returned to the radiator when it cools down.
So it increases in the tank and my be what happened when it got hot again and the radiator built up pressure.
Blew out the overflow.
Changing the cap may be the solution.
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