YS 91AC

[Ihncheol Park]

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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