YS 1.20 AC

[Robert Schofield]

Replace the diaphram, regulator plunger and make sure the check valve is not leaking. Put a piece of fuel tubing on the outlet side, put it in a glass of water and blow on the tube. If you see any bubbles, replace the check valve.   

Good luck,
Bob S.
  ----- Original Message ----- 
  From: jjvoth 
  To: discussion at nsrca.org 
  Sent: Friday, May 20, 2005 11:02 PM
  Subject: Re: YS 1.20 AC


  I didn't take the engine apart to look at what Eric was talking about but I did blow through both the crankcase and the air box and both seemed to be open. 

  Jerry
    ----- Original Message ----- 
    From: Richard Strickland 
    To: discussion at nsrca.org 
    Sent: Friday, May 20, 2005 3:41 PM
    Subject: Re: YS 1.20 AC


    Eric's ideas seem to have merit.  When they've run well in the past and start acting up, many times it's just a tiny piece of crap driving you nuts.

    Richard
      ----- Original Message ----- 
      From: Jerry Voth 
      To: discussion at nsrca.org 
      Sent: Friday, May 20, 2005 3:31 PM
      Subject: Re: YS 1.20 AC


      Let me put it this way;NO!!!!
        ----- Original Message ----- 
        From: Richard Strickland 
        To: discussion at nsrca.org 
        Sent: Friday, May 20, 2005 3:24 PM
        Subject: Re: YS 1.20 AC


        Hi Jerry,

        You might check to see if your motor mount or something else has loosened a bit and allows some part to come in contact with something it shouldn't--like pinching a line. Possibly look at the nose ring area and a shift that may cause some drag.  Don't you love the intermittent mystery?!

        Richard
          ----- Original Message ----- 
          From: jjvoth 
          To: discussion at nsrca.org 
          Sent: Friday, May 20, 2005 1:17 PM
          Subject: YS 1.20 AC


          Anyone have any ideas why this engine quits running  when exiting the triangle loop or the full roll after the half inside loop in the Masters pattern.
          I can't remember ever having this engine quit since it was new. I've checked the fuel lines, replaced the pickup line in the tank, changed the diaphragm, checked the fuel passages in the regulator and carb, changed plugs, reset the idle screw and cleaned the filter. It runs fine with plenty of power (for an AC) and it doesn't quit on the above maneuvers every time.

          Any help would be appreciated.

          Jerry
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