My 17 hp Kia Kawasaki (FH541V) with 700 hours started making a clicking sound, so I took off the valve covers to adjust the valve lash. The push rod for one of the exhaust valves was bent, and some carbon was deposited around the valve lifters (see pictures). I bent the push rod back straight (I can't afford to have the mower down right now--my backup mower is broken, waiting on a part) and put it back together until I can get a new push rod and head gasket (so I can pull the head). It runs fine for the moment. . . Does the carbon deposit under the valve cover mean I have a bad valve guide? Something else? What do I need to replace? Should I just replace the whole head? Or wait until I can pull the head and examine closer? Thanks in advance for any help you all can offer.