996 Coolant Issue

I have a 996 that I have been doing a bit of tlc on, there is one issue that I am struggling with, after idling for a while, it throws coolant out

After some research, and comments from other owners, it was decided that the expansion tank was the issue, however, I have fitted a new expansion tank, and the rubber seal, 20 minutes idling, no issus, at around 25 minutes, it starts spitting steam and coolant out

Any ideas?

thanks

https://youtube.com/shorts/ct3KQhGzsvQ?si=jUB0X0C3dbkBWM7L

 

Just an observation, the small pipe that goes to the secondary expansion tank, doesn't have a jubilee clip securing it in place to the upper tank, if that is not secured tightly, would that cause an issue, with it not holding pressure?

 

Normally, just over running temp, I have tested the fan, which does kick in and out as it should

 

Bike upright, filled to the max level on the side of the tank

 

In the video in the opening post, it shows the steam/coolant appearing to come from between the expansion and the filler neck

 

I will check the level, and drop it to the minimum level, and try again

 

I know it should, I can see the markings where it should be, the question was more along the lines of, with the clip missing, would/could that cause the issue, if it is not sealing correctly?

 

I will replace the missing pipe clamp, reduce the coolant level to minimum, and run it up to temp again in the morning, and get more accurate info regarding running temp if/when it starts blowing off

 

I replaced the O ring and the expansion tank by the same time, the filler neck and cap are the original ones though