Need help with YS 63 & Dayton, OH Contest...

[Harry Slone]

Larry,
Mark Atwood is at the field in Dayton....even as we speak.  He is expecting to see you this afternoon and help you with the engine and any trim questions you have.
Harry..

  ----- Original Message ----- 
  From: Tony Stillman 
  To: discussion at nsrca.org 
  Sent: Friday, May 30, 2003 9:43 AM
  Subject: Re: Need help with YS 63 & Dayton, OH Contest...


  Larry:

  Yes, I have seen this.  If the engine is leaking, the plunger is not seating.  That can be due to dirt, or the mold flashing as you have discovered.  

  Tony Stillman
  Radio South
  3702 N. Pace Blvd.
  Pensacola, FL 32505
  1-800-962-7802
  www.radiosouthrc.com
    ----- Original Message ----- 
    From: jed241 at msn.com 
    To: NSRCA 
    Sent: Friday, May 30, 2003 12:11 AM
    Subject: Re: Need help with YS 63 & Dayton, OH Contest...


    Never got a reply on the e-mail below, but I think I found an interesting problem. This may also apply to some of the other YS problems with leaking fuel through the carb. I believe the part is either the same or similar.

    I pulled the regulator body apart and didn't find any debris. It was very clean. After taking each piece apart and carefully inspecting for any defects, I noted that the silicon seal that the plunger fits into, and the spring fits on, may have caused the leak. Not due to damage or wear, but poor quality control of the molding operation.

    Around the outer edge, you can see thick flashing. When I set this in the regulator body and looked very close when applying force to the spring, there is an interference that would prevent proper sealing of the seat. The interference is the flashing hitting the regulator body and preventing the proper seal in the hole to the plunger.

    I trimmed the flashing off and put it back together. Engine is better than ever and no more leaking.

    This makes sense as a brand new part could seal when new. After a few flights and getting broke in, then the flashing prevents a good seal. The only way to recover this would to increase the spring tension by screwing in the adjustment screw to apply more force on the spring for the seal.

    Has anybody else seen this problem?

    Engine is working fine now, so I guess I have to make my first contest in Dayton, OH this weekend. After practicing in a cross wind, I think I'm going to get my own hard hat just in case.<VBG> Should be at the field around 5pm. I will need much help in trimming the plane. Didn't get allot of flying time with the weather in southern Indiana. If anyone is going to stay at a Holiday Inn let me know. I think I can get a military discount for any rooms I pay for (you would have to give me the money though ;^) Military rates are often the best rates Holiday Inn offers.

    See ya,

    Larry

      ----- Original Message ----- 
      From: jed241 at msn.com 
      To: NSRCA 
      Sent: Monday, May 26, 2003 5:12 PM
      Subject: Need help with YS 63


      The engine started leaking fuel through the carb just dripping out and floods. It just started doing this. Tank pressure is good. I only have about 10 flights on this engine and today is the first time it refused to start.

      I checked the diaphram in the regulator and it is in good shape.

      Thanks for your help..

      Larry

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