Hey i have a 2011 crf450, i just put it back together after having the cases split and tranny across my entire shop, cleaned everything, changed ALL bearings and seals in crankcase and top end. New piston, rings, head gasket, valves, everything. Put an entirely new water pump in it, have it all back together and still drains right out of the weep hole. So i took the cover off and had a honda dealer put an entirely new water pump in it, thinking maybe i broke the seal when i pressed it in. And still, without it running, radiator cap off, when i dump fluid in it drains right out. I tried riding it anyways, it doesnt leak while running, but as soon as i got back from a break in ride when i shut off the engine the radiator fluid empties through the weep hole! Any ideas GREATLY APPRECIATED!

Thank you!