YS valve not the only problem

[John Pavlick]

Ken,
 Does it start Ok after it cools off? Make sure you set the valve lash
correctly. You shouldn't have a lot of movement in the crank. That's another
problem. At this point it is probably worth sending it in for service. Most
of the guys I know that are flying YS have a backup motor - probably would
be a good idea to find a second one. That way you can get the plane in the
air while your motor is out for service. Before you send it in though, check
the compression and the valve lash. You might find something there.
John Pavlick
http://www.idseng.com


  -----Original Message-----
  From: discussion-request at nsrca.org [mailto:discussion-request at nsrca.org]On
Behalf Of Ken Thompson
  Sent: Wednesday, June 08, 2005 9:05 PM
  To: discussion at nsrca.org
  Subject: YS valve not the only problem


  I just fired my YS-91 up after the valve cleaning.  It fired immediately
and had plenty of power while still running rich.  After running for a
minute or two the rpm's started fluctuating a bit.  The more it ran the less
rpm's I was able to maintain.  I heard a noticable rattle that seemed to be
coming from the engine area.  After the engine ran for about 5 minutes, the
rpm's started to drop more.  I leaned the needle a little and the revs
didn't increase, so I richened it back up and idled down, the motor died.  I
felt the spinner to see if it was warm and it wasn't, that's when I noticed
the movement of the output shaft.  My first thought is the front bearing, I
have quite a bit of movement up and down and a little side to side.

  I guess I'm not meant to fly this plane.  Does anybody know where I can
get a good YS-91, cheap?

  I think this one is going back to YS.

  Ken

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