[NSRCA-discussion] 120 AC issues Not the Piston

[Ken Velez]

Not that I know all about YS but I would be looking for an air leak. Something is opening a gap or separating when the engine gets hot making it hotter and loosing throttle response. I know you have check a lot of things but check for loose screws or broken head look at the carb needle o-ring or the throttle butterfly seal for a split or the screw in the back of the carb for tightness. I don't think it is internal to the engine but with so many possibilities?? I once found that grabbing the motor to loosen a head bolt I actually dislocated a pushrod housing from the o-ring. Every looked ok but it was leaking air thru it. Just my thoughts,

Ken
  ----- Original Message ----- 
  From: RUDDERCABL at aol.com 
  To: nsrca-discussion at lists.nsrca.org 
  Sent: Tuesday, July 15, 2008 10:15 PM
  Subject: Re: [NSRCA-discussion] 120 AC issues Not the Piston


  In a message dated 7/15/2008 3:15:33 PM Eastern Daylight Time, schale at optonline.net writes:
    exchanged the piston and ring for a brand new one out of an unrun 
    motor.  Basically no change.  So either both pistons are bad or it is 
    something else.
    I pulled a motor that ran fine out of my Asteris Omen.  Motor has little 
    time after a Futaba warranty rebuild way back when.   Most of the 
    internal parts were new.  It ran fine when I started flying again 3 
    years ago.  Put it in the Dalotel and ran it for 7 minutes no issues.
  Stu

  Aparently , it wasn't the pipe as I had suggested. Have you checked the fuel line inside of the tank and the clunk ? 

  I wish you hadn't fallen into the fuel trap. 30% heli fuel isn't the answer for all YS engines. Remember , the AC engines were around long before that fuel and ran great without it. Any high quality 20 or 25 % all synthetic fuel should run just fine.

  Robert





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