Delightful Day...Almost

It was overcast and under 50F, but still hardly a breath of air, and NO rain.  I made another 5 flights with the Sbach, trying to tune the engine to decrease the black oil residue that spits onto the bottom of the plane from the JTec pitts style muffler.  Leaning out the high end did not seem to help, nor did both opening and closing the low needle by a smidge.  The engine runs strong and smooth to me, and the residue is just a minor issue.  It does make cleanup necessary though, to have that black spit on the entire length of the fuse bottom at the end of the flying session.  In any case, the plane flew great again today, with all good landings.  Slow rolls are so effortless with this plane, and the rolling circle is easier to get done in four rolls with this plane.  Like yesterday, nobody showed up for the nearly 2 hours I was at the field.