4-stroke problem

[jed241 at msn.com]

George,

I used an eye loop to catch the flashing. I couldn't tell it was the problem until I put the spring on and compressed the seal a bit. Didn't contact much and could barely see it, but worked fine after I trimmed it and put it back together.

See ya,

Larry
  ----- Original Message ----- 
  From: george kennie 
  To: discussion at nsrca.org 
  Sent: Saturday, June 14, 2003 7:48 PM
  Subject: Re: 4-stroke problem


  Bob, 
  The silicon valve and it's seat look perfect looking through a loop and it holds back pressure under manual manipulation. The check valve appears to be operating normally and the condition persists both in the plane and on the bench with two different check valves. 
  Thanks for the suggestions. I will probably have to send it back, but was hoping to avoid doing so. 
  Georgie 
  Bob Kane wrote: 

    You have tried everything I can think of.  Something is holding the regulator plunger open or the little silicone valve or seat is damaged. I notice from the manual that the tank is pressurized the "old fashioned" way via a nipple above the regulator. Have you tested the check valve? Could the check valve be allowing back pressure from the tank to get to the diaphram and holding it open?  Just a thought. 
    george kennie <geobet at gis.net> wrote: 

      I'm having a difficult time with a brand new YS-63. Running Powermaster 
      YS-Blend 20/20, 12X6 APC, OS-F. It starts O.K., but when you advance the 
      throttle to full it takes about 20 seconds to slowly build up to max rpm 
      and then if you retard the throttle to anything below 8-9k rpm and leave 
      it there within approx. 5 seconds it will start to "splat, splat, splat" 
      and then abruptly quits, or if you try to advance the throttle it will 
      do the same thing and quit.After it quits, fuel will well up in the carb 
      bowl and overflow like the plunger in the regulator is not seating, 
      however I have inspected the regulator and the plunger silicon valve and 
      everything appears O.K. I can even blow through the feed aperture in 
      the regulator and no air will go through it until I push on the plunger. 
      The are no burrs or any stickiness impeding the smooth operation of the 
      plunger and yet after a short run of a few seconds it acts like the 
      plunger is sticking in the depressed position.I've tried turning the 
      regulator screw as much as a couple of turns in as well as out and 
      nothing seems to help. 
      Anybody know why the regulator seems to be allowing fuel passage when 
      the engine isn't running? I compared the regulator spring length to a 
      brand new unit and it has the same length. There are no holes in the 
      diaphragm and the silicone valve seat appears smooth and does seat and 
      seal manually. 
      It will Idle, but as I recall that's a completely separate fuel 
      circuit.Is there something in the high speed carburetor circuit that 
      could be malfunctioning in such a way that pressure is getting back to 
      the top side of the plunger and holding it in the open position? 
      What do I do here, guys? Eric? Anyone? 
      Thanks guys, 
      Desperate Georgie 
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    Bob Kane 
    getterflash at yahoo.com 



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