pressure in radiator after cooled down

Hey guys,


ive got a problem.

yesterday i started my bike after it has been sitting around for a month ( needed a new header which i got and installed yesterday).

Rode it for 15 -20 minutes on my block.

Today i wanted to check the coolant level.

After opening the radiator cap it still had pressure in it and some coolant burst out.


What could be the problem?


Oh and it did not spray from the overflow hose when riding yesterday

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