Foamy/Aireated Coolant

[GoHiSK1]

Have an issue with the antifreeze in my 2009 Dragon Switchback.
If I run the sled after a short warmup the coolant in the bottle looks almost foamy or aireaterd. I have to keep the coolant level in the bottle 2" bellow the Cold full level or it will overflow out the over flow hose.
I have changed out the Rad cap with no change . Also inspected the cylinder 'O' rings and changed them out for New ones and still the same condition excites.
Have now ran the sled for at least 300-400 miles like this without any over heating problems or running issues. Engine has about 2700 miles on it.
I am at a loss as to what is causing this problem . Any help or suggestions would be appreciated .

Thanks Jigger.

 

[instigator]

air

base gasket is leaking - had that same condition on my 800 SB. Found a tiny piece of aluminum between the cylinder and gasket allowing just a small amount of air to be sucked in.

 

[GoHiSK1]

Air

Thanks for the tip.
If that was the case why do I not see any antifreeze in the belly pan or on the ground. Would think after engine was shut down the 10 - 15 psi. in the cooling system would push coolant out side the crankcase or into the crankcase . [not good ] Also coolant level stays at a consistent level in the bottle .

 

[Mag]

Look like this?

http://www.youtube.com/watch?v=mbY3OhkAS3I&list=UUlIyMKcuQPSbMTmTktilv8A

I flushed the coolant and re bled the system to get it to stop.

 

[GoHiSK1]

Look like this .

Not quite that bad . Will drain the coolant and refill with new .
Easy enough to do and who knows maybe the coolant that is in there now is tired.