well tonight i whipped the tank off and checked all my lines, pretty sure they are correct, as they are different sizes, but to note the hose from bottom on my expansion tank, (that goes to the top of the rad next to the rad cap), somehow was wedged under my airbox and rear shock mount, pinching it tight, it was pretty tight in there and took some pulling out, no doubt this would be causing some issues.
My bike melted a piston 2weeks ago, hence my new rebuild on sat morn, but its was pushing out water before, and still is now. So im thinking due to the intense heat, i may have warped my head, so i took that off tonight aswell. I put it on my steel workbench which is flat, and there is slight rocking motion, if i press with my finger on the front bolt recess next to where the rad hose connects, it lifts the back side ever so slightly.
Rang my yam dealer early this morning thou, the guy i always deal with there used to personally race banshees in mx, and pretty sure won the Pont De Vaux enduro a few times, he was confident that my problem was the head gasket, so ive got that on the way and he has heads in stock for £30, so il prob get one aswell. Hopefully be sorted by the weekend! Keep you posted