YS 63 question

[LowPass]

RE: YS 63 questionChuck:

I have three .63s with one being the latest version with the regulator on the 
push rods. It seems that the latest version would be the least likely to "cook" the 
regulator diaphragm given that it is mounted on the pushrods versus the bottom
front of the crankcase as in the older versions.

If you are "punching" the throttle hard and the engine backfires it is too
lean through the mid-range (which is definitely affected by the regulator) or
the main needle is too lean.

Were you leaning the main needle to get the idle to work properly and then it backfires?
If so,  the suggestion in previous responses may be correct about leaning out the idle
circuit by opening the idle air bleed screw.

If not,  you should richen the regulator (counter clockwise) and see if it helps.

Terry
  ----- Original Message ----- 
  From: Chuck Czarnik 
  To: discussion at nsrca.org 
  Sent: Wednesday, September 08, 2004 8:58 PM
  Subject: RE: YS 63 question


   CP 30 heli blend, fuel system was holding pressure, but didn't really pump up like the engines I run.  Fuel was fine, he is an active heli flyer and runs the same jug in his helis. 

  First flight ran fine without touching the regulators.  These are the newest 63's with the regulator on the pushrods.  Screw looked to be about 1 turn in from flush (factory settings)  Symptoms started after pulling the plane out of storage for a couple of months.  For that first flight, engines were completely cowled with no cooling whatsoever other than valve head sticking out of cowl.  Not much smoke unless you ran the engines very very rich when he had out on Mon.

  I think heat damaged something, maybe overheated the regulators after that first flight and cooked the silicone?  Whatever happened got both engines, they have the exact same symptoms.  Separate fuel systems, btw.  I asked him about after run oil, couldn't get a good answer there, but I don't think he used any. (good news for the silicone).

  -----Original Message-----
  From: discussion-request at nsrca.org
  To: discussion at nsrca.org
  Sent: 9/8/04 7:43 PM
  Subject: Re: YS 63 question

  Chuck:

  Sounds like the regulators are set lean or not working correctly. 

  What fuel is he using? Are you sure that it is good?

  Are you sure that the fuel system is holding pressure?

  How much time on the engines?

  Terry


  ----- Original Message -----
  From: Chuck Czarnik <mailto:CCzarnik at arclp.com> 
  To: discussion at nsrca.org <mailto:discussion at nsrca.org> 
  Sent: Wednesday, September 08, 2004 8:06 PM
  Subject: YS 63 question


  Quiet in here..

  Tried to help a friend out at the field on Mon with a pair of YS63's on
  a twin.  Flew fine on the first flight several months ago, but both of
  them now will not hold idle when he pulled the plane back out this week.
  They mostly run at 3000 up, just abruptly die below that.. Like fuel
  starvation.  If you punch the throttle hard, the engines would usually
  backfire and immediately die unless you ran quite rich.  Looks like he
  may have had a cooling issue on both engines (no cowl air other than
  valve cover).  Both engines doing exact same thing.  Possible heat
  damage?    Something ate both regulators?  I ran out of ideas.

  Not a pattern plane, but there is a lot of YS knowledge on this list..
  Any thoughts?
  TIA, Chuck


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