Help With Expansion Tank Hoses Please??

Hi Guys/Gals

I have a 2002 Speed triple and cannot find this info in the manual or on line, the coolant expansion tank under the riders seat has 2 small hoses connected to it, one comes from the radiator cap flange but the second hose is just hanging free, is this correct? I though it was a pressurized system and that any excess coolant will be returned to the radiator?

 

Yes , that's normal . the hose that hangs free is to vent excess coolant if some cluster f#*k put's far too much water/coolant in the system !

 

The coolant in the radiator is pressurised, as pressure builds excess passes through to the expansion tank.
As it cools, the pressure drops and shrinks being refilled by the coolant in the expansion tank

If the valve fails, pressure passes to the coolant tank and any excess coolant is vented through the drain tube to vacate at the bottom of the bike...

Like my bike did here:

 

Not good

 

Cheers, so I assume the upper/higher hose is the runoff and the lower hose comes from the radiator?

 

Great thanks, my hose was at the top of the engine so poured hot coolant all over my engine...

 

I cant remember the routing of the hoses.
next time I take the seat off I will take a peak and photo if I remember

 

Thanks, I guess it must be the lower one that goes to the radiator or any liquid in there would just drain out onto the floor making it empty all the time.