On my gsr we took off the head to do the head gasket, we noticed every valve excpet for one was black, the far right exhaust valve was brown like a noticable different color then the others, is it not opening properly or what?

 

Sounds like that valve is sticking open a little, and is getting too hot. When that happens, it generally burns off all carbon deposites. Its also a good way to drop a valve, since the extra heat hurts its strength.