I am thinking its a single cylinder Briggs on a Timecutter-judging by the muffler mount strap.
What you see is, I think, burnt motor oil deposits. I guess with 600+ hrs on it the guide is not tight as it once was and part of the exhaust gas is following the exhaust valve guide back into the rocker chamber. (no valve stem seal on exhaust, if I remember correctly.)
I wouldn't worry about it too much. At those hours You have pretty much the expected service life out of the engine and its not practical to replace the head or put a valve guide in it just because of those black deposits. I can tell you manitained it well, you never would have that many hours on it if you hadn't.
Just keep the cooling fins clear of debris and keep the oil level above the add mark and don't worry about it until someother problem crops up.
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Today's Featured Article - Hydraulic Basics - Part 2 - by Curtis Von Fange. In the last entry to this series we gave a brief overview of hydraulic system theory, its basic components and how it works. Now lets take a look at some general maintenance tips that will keep our system operating to its fullest potential. The two biggest enemies to a hydraulic system are dirt and water. Dirt can score the insides of cylinders, spool valves and pumps. Wate
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