Tip for those having oil leaking seal on muffler.  I discovered today that cranking down on the locking nut ACTUALLY LOOSENS the muffler assembly.  I had my son's help in tightening the front long screw, and with his assistance I started to tighten the locking nut.  That's when I observed the screw head rotating. We loosened everything and started over.  The second time I applied less pressure on the locking bolt and had him hold the screw in place.  Next engine run, no leaking at the silver center piece of the muffler. 

I also tweeked the Low end Needle and now have it spinning  a 12x6 at 12,500 high, and 3200 reliable at low.  I think it might get a little lower after a few flights and switching to the fully synthetic oil..

KKKKFL