oil overflow

[black&blue]

i havent rode my 04 yfz450 in a while and i checked the oil before riding today and it wasnt even toutching the dip stick (ya i know i was supposed to warm it up first) so i filled it up to the full line and went and rode. about 10 minutes later i checked it and it was completely filled to the top of the oil resivoir tank. so i drained it out till it was rite on the full line while it was still warm and then went and rode some more and about 2 hours later it was completely filled to the top again so im not sure if something is wrong or if i am doing something wrong so please help

[deathman53]

I bet its just like what happened on my ktm dirtbike, something was causing a restriction and oil pressure is backing up. It has no where to go and heats up, then it comes out the cases or the oil tank. Change the oil and filter(s), the problem shoulg go away. My ktm has 4 oil filters(screens), I Changed and cleaned them, along with new oil. The problem was gone.