OS 1.40 Dies at Throttle Up Fixed

[ronlock]

Thanks to the many who made suggestions.  Pipe baffels were OK.   
I cleaned  lines and carb.  Re-asembled and found the  transition
OK,  but  engine gradually slows down and dies at idle.   Richened  
the idle, all  seems OK  now during ground checks.

Later,  Ron Lockhart
  -----Original Message-----
  From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On Behalf Of ronlock
  Sent: Sunday, May 11, 2003 1:08 PM
  To: discussion at nsrca.org
  Subject: OS 1.40 Dies at Throttle Up


  Hi  all,

  I have an OS 1.40 with only 15  flights on it.  Break in  and first 15  flights
  over last couple of months were fine.   

  Yesterday first two flights were fine. Carried plane to take off position for
  third flight, engine went rich and died at throttle up.   Re-started and
  got same result.   Changed to new OS-F plug, and went to lighter
  load prop.   Same result.  Set high  speed needle to near peak.
  Same result.   Been using same jug of 15% nitro fuel for all flights.
  Pipe is Bolly 26 inches piston face to baffel- same as first 15 flights.
  Ive checked fuel lines, tank, remote needle, carb,  for leaks, and for
  flow -  all seems OK.    

  I discovered I  can blow air thru the pump in  the direction of fuel flow,  
  but not backwards.    Anyone  know, is that normal?

  Other suggestions?  -  What changed between 15th and attempt at
  16th flight?

  Thanks,   Ron Lockhart
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