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dunno what to tell you. it does sound suspicious that you should blow a valve cover gasket after doing the Kleen removal, but like I said, yours is the first that I've heard about doing this. To give you a bit more confidence, they have been doing this mod on other Kawasaki models long before the 250 new gens ever came out and I've not heard of problems with those bikes, either.
I would keep it as is and see if you have further problems. If you do, put the Kleen system back in and install a filter on the end of the hose that normally would have connected to the airbox.
I would not do, as you suggested, to use the the valve to purge out gases from the head. Not only would you upset the exhaust system in it's entirety, but you would be purging hot exhaust gases into rubber hoses not designed to handle that heat load.... and, I might add, your gas tank sits right above that valve port. Please don't do this.
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