Coolan flow schema

Hello!

I have been looking at drawings and the bike and I am not able to figure out how the coolant flows in the brick engine.
Is there any thermostat bypass channel? Or maybe I don't get how temperature regulation should work.
From the beginning. I have changed the radiator to 3 core from K100. I've assumed that the thermostat will handle temperature management and engine will war up normally in short circuit and then thermostat will do its work. I've tested the thermostat - works fine, yet the engine is whole time a bit too cold, and gets warm up too long. So WTF? Is there a bypass channel?
So if Someone can explain to us the way the coolant flows and regulation works I would be more than happy.

Best re

Lammi_HH thanks a million. That clears a lot to me. So it looks like that when engine goes over 85 then the radiator is enough big to hold the temperature around 85-90 and thus it don't get any warmer until really hart or hot conditions.

Best regards,