YS 91AC

[Ken Thompson]

The pushrods are actuating the valves, so all seems to be well there.

Ken
  ----- Original Message ----- 
  From: Ihncheol Park 
  To: discussion at nsrca.org 
  Sent: Wednesday, June 01, 2005 11:06 PM
  Subject: RE: YS 91AC



  Have you checked the pushrods? There are two tubes in front of the head that house the pushrods.  If they break, the crank turns almost no pressure.  
  Mike Lance in D8 had that problem with 140 once during contest.


  Ihncheol Park




------------------------------------------------------------------------------
  From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org] On Behalf Of Ken Thompson
  Sent: Wednesday, June 01, 2005 7:05 PM
  To: discussion at nsrca.org
  Subject: YS 91AC


  Hi all,

  I have a YS-91AC that came in a plane I aquired last weekend.  On the 16th flight I lost the motor about 2 minutes into my routine.  After a safe, and pretty nice landing, I might add, I brought it back to the pits to see what happened.  I could turn the prop by hand with almost no back-pressure.  
  I pulled the motor out when I got home and checked it out the best I know how.  Pulling off the backplate I see the connecting rod and piston seem to be OK and the valves seem to be moving like they're supposed to.  I don't know a lot about these engines, as this is the first YS I've run in a plane. 

  What I need to know is where is the best place to send the motor to be checked out and re-built.  I don't want it just patched up, I would like it done right, but a quick turn around.

  Asking too much?

  Thanks in advance,

  Ken Thompson
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