07 yz 450 loosing coolant

Hey guys. I just noticed recently that my bike is using coolant. Lets say if i take it for a ride for about 20 minutes it will use about 2cups of water.***?I DONT GET IT PLEASE HELP!the bike has 39hrs on it.It has been through 5oil&filter changes, and i shimmed the valves once. I dont know what it could be.If i go for a cool down lap like cruisin in fifth for a mile or so it will still be pushing coolant out of the overflow.

Head gasket or a water pump seal.

rad cap may be gone?

Thanks for the suggestions. I will try the cap first.

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