Hi everyone, hoping someone can help me out very quickly with this issue! I have a 07 stander, 52 inch deck with the 19hp kawasaki FH580V engine. It has about 601 hrs on it. Earlier this spring we replaced the valve seal in the right side(right meaning standing behind the mower and to the the right). Today, however, I blew a tire halfway through a job and went back replace it when all of a sudden is began running on one cylinder. The intake valve seems to be stuck open(the same one that was replaced) and the rocker arm is loose and came off the pushrod and bent the pushrod. Any suggestions on a fix for this? A new head? I'm not sure if the piston is damaged yet or not, will check tomorrow tho. If it does need a new head, whats the price range? Or is this a thing with these engines and do you suggest getting an entire new/different engine? This is going to be a major hindrance if i can't get this resolved quickly. I'm a small time landscaper and this is my only mower Thanks everyone!