I am new to this site & secrched this & found no compatble results. I have a FB 460 Kawasiki on a John deere walk behind that has died. I tore in to it & found that the Intake valve seat was cracked & the guide is loose or moves when the valve opens & closes. which is why I have only 50 PSI. of compresion. I was told that this is not repairable? Any Info that any of you can give me would be Apreciated. If this is not reparable then I will have to decide what to do next get a new or used motor or a new or used mower. Thanks in Advance for the advice.