My CBR h is spewing coolant from the radiator cap at idle as soon as it gets to operating temp. I replaced the cap thinking it was the issue but still dumping coolant out the cap. I got to looking and it seems the lip on the radiator filler neck is bent down so I straightened it the best i could and put a rubber stopper in under the cap to totally block of the cap and put the cap over it. Still blew out coolant. So i ran a compression test thinking blown head gasket but all cylinders read great compression. My question is simply by me blocking off the reservoir and cap but putting in the stopper would it create enough pressure to blow by the stopper and out the cap or is there excessive pressure coming from somewhere else? If it is normal pressure that means i have to junk a perfectly great radiator over a stupid bent lip or is there any other fix you guys can help me think of.