Posted: 27 May 2009 at 5:07pm | IP Logged

I have a new, broken-in ( about a dozen tank fulls) F-54s.  It idles great and full throttle performance is fine.  EXCEPT when I put my plane in loops the motor stumbles and sometimes dies.  Fortunatley most of my dead sticks have been successful.  It has died on a series of rolls but typically loops are the worse.  I have kind of reproduced this on in the pits by turning the plane inverted.  The plane loses rpm and smokes more then dies.  So I would say it is running too rich when inverted.  The fuel line looks fine, no air in the line.

Although the engine was new a couple of months ago it had sat on a workbench since 1998 prior to that!  It has the older style carb with an air bleed adjustment for idle . . . although the problem has not been while the engine is at idle.  It is usually 3/4 to full throttle when doing rolls and loops. 

Is this a common problem with the older TT and is there a fix beside not doing loops and rolls.  Thats' the parts that are the most fun!