07 yzf 450 blowing vavle cover gaskets

Hi every one I just picked up a 07 yzf 450 very nice bike. Starts every first to second kick idles runs great. I rode it for bout an hour, wile i was at wide open throttle the valvecover gasket blew out. Replaced with oem gasket checked to make sure nothing was in breather line, I got it back together and rode it for 5-6 hours, wen I got back home I noticed that air/oil was weeping threw bottom of vent hose, so I cleaned it Up and put in shed. The next day I took it for ride up the road and back, on the way back I was about quarter throttle and the valve cover blew again? Bike still starts and runs great I don't get it any help would be appreciated.

Oil is at right level to

Edited by Shawns07

Pulled top end off there were no cracks in piston or head? Anything els I should be checking? I noticed that piston is a high comp piston could that be the problem? I'm ordering new stock piston and gaskets hopefully this fixes problem

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now