I have an 03 zx6rr and i was stunting it the other day. just doing decent wheelies and endos and then i started riding home and it was missing out bad. i left it running infront of my house for about 15 mintues then came out and there was coolant all over and the bike was overheating. I turned it off and checked all the hoses. nothing was leaking. so i rode it around the neighborhood after it cooled down and still was missing. I took the airbox off and noticed there was oil in the airbox. i know that its caused by endoes and wheelies from the crankcase tube into the airbox. a friend told me it was hydrolocked and told me to take all the sparkplugs out. crank it over a few times. then after cleaning the plugs put them back in. so i did all that and i went to ride off and i noticed my head cover gasket was leaking. also the motor then started to miss out again. I am just wondering what the problem is? It is my first cyclinder missing out. I got engine ice for coolant and that overheating problem is fixed. now i just wnat to fix the missing out. i am going to run that KLEEN airbox system. i orderd a new gasket and 4 new iridium plugs. but any suggestions on what it could be? and also how tight do i tight the head cover bolts?