wr450 07 oil leak in cylinder head

i have oil coming from between the cylinder head and top of cylinder i have followed instructions in the book and even taken apart again when i restarted it seemed ok and then when i rode bike it started to leak again any ideas should i get a new gasket

I have read about some people having issues with the o-rings in between the head and the cylinder. Even if you put the head gasket in right, if the o-rings aren't good I guess you will have a leak.

i have now just taken apart my engine once again and cleaned every part reinstalled everything and now when i hit the button i can hear a hissing coming from cylinder head and it wont start any ideas any one this is one of those athena big bore kits any one had any probs also any one got a spare gasket for cylinder head that they would sell me all help greatly appreciated

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